35 results on '"Shui, Miao"'
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2. RETURN TO ISSUEPREVFOOD SAFETY AND TOXI...NEXT Multilaboratory Collaborative Study of a Nontarget Data Acquisition for Target Analysis (nDATA) Workflow Using Liquid Chromatography-High-Resolution Accurate Mass Spectrometry for Pesticide Screening in...
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Wong, Jon W., Wang, Jian, Chang, James S., Chow, Willis, Carlson, Roland, Rajski, Łukasz, Fernández-Alba, Amadeo R., Self, Randy, Cooke, William K., Lock, Christopher M., Mercer, Gregory E., Mastovska, Katerina, Schmitz, John, Vaclavik, Lukas, Lingyun Li, Panawennage, Deepika, Guo-Fang Pang, Heng Zhou, Shui Miao, and Clare Ho
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- 2021
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3. Polymorphism-Controlled Electrochemical Energy Storage Performance of LiNbWO6
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Cheng, Xing, Liu, Tingting, Yu, Haoxiang, Ran, Fanmin, Ye, Wuquan, Zhu, Haojie, Shui, Miao, Xie, Ying, and Shu, Jie
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Different atomic arrangements lead to the changes of the electronic structures, which in turn affect the voltages, the diffusion dynamics, and relevant electrochemical properties of the materials. In this study, the inherent properties and lithium storage mechanism of polymorphic LiNbWO6, tetragonal and hexagonal phases, are investigated in detail via experimental techniques and density functional theory calculations. The specific capacity of LiNbWO6-T at a high mass loading of about 10 mg cm–2is 200.4 mA h g–1, and its Coulombic efficiency is 90.5% at 100 mA g–1. Conversely, the reversible capacity of LiNbWO6-H is only 20.5 mA h g–1with a Coulombic efficiency of 70.3% at 50 mA g–1. Our experiments show that tetragonal LiNbWO6manifests higher specific capacity, faster Li-ion storage kinetics, and superior electrochemical performance in comparison to the hexagonal phase. The results suggest that tetragonal LiNbWO6is a promising host for highly efficient lithium storage applications.
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- 2020
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4. Observation of ZrNb14O37 Nanowires as a Lithium Container via In Situ and Ex Situ Techniques for High-Performance Lithium-Ion Batteries.
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Li, Yuhang, Zheng, Runtian, Yu, Haoxiang, Cheng, Xing, Liu, Tingting, Peng, Na, Zhang, Jundong, Shui, Miao, and Shu, Jie
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- 2019
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5. Development status and future prospect of non-aqueous potassium ion batteries for large scale energy storage.
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Zhang, Jundong, Liu, Tingting, Cheng, Xing, Xia, Maoting, Zheng, Runtian, Peng, Na, Yu, Haoxiang, Shui, Miao, and Shu, Jie
- Abstract
Lithium ion batteries (LIBs) as the mainstream rechargeable batteries are widely used in industrial production and life. However, it is hard to meet the demand in the future due to the lack of lithium resources. At the same time, increasingly scarce lithium resources will increase the cost of LIBs. In contrast, potassium is abundant in the earth's crust, and available researches suggest that rechargeable potassium ion batteries (KIBs) may be a promising substitute for LIBs. In this paper, the research progress of non-aqueous KIBs is reviewed, including cathode materials, anode materials, electrolytes, binders, opportunities and future challenges. Firstly, cathode and anode materials are summarized according to the different reaction types. Secondly, the application and influence of electrolytes and binders for non-aqueous KIBs are also discussed. Moreover, in order to promote the advancement for non-aqueous KIBs, the main future challenges and some solutions are also proposed. Image 1 • The present situation and advantages of non-aqueous KIBs are discussed. • A review of electrode materials, electrolytes and binders for KIBs. • Challenges and opportunities for KIBs in the future are pointed out. [ABSTRACT FROM AUTHOR]
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- 2019
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6. Constructing Hollow Nanofibers To Boost Electrochemical Performance: Insight into Kinetics and the Li Storage Mechanism for CrNb49O124.
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Ye, Wuquan, Yu, Haoxiang, Cheng, Xing, Zhu, Haojie, Zheng, Runtian, Liu, Tingting, Long, Nengbing, Shui, Miao, and Shu, Jie
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- 2019
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7. H0.92K0.08TiNbO5 Nanowires Enabling High-Performance Lithium-Ion Uptake.
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Yuan, Yu, Yu, Haoxiang, Cheng, Xing, Ye, Wuquan, Liu, Tingting, Zheng, Runtian, Long, Nengbing, Shui, Miao, and Shu, Jie
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- 2019
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8. Deep insights into kinetics and structural evolution of nitrogen-doped carbon coated TiNb24O62 nanowires as high-performance lithium container.
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Yu, Haoxiang, Cheng, Xing, Zhu, Haojie, Zheng, Runtian, Liu, Tingting, Zhang, Jundong, Shui, Miao, Xie, Ying, and Shu, Jie
- Abstract
Abstract TiNb 24 O 62 with large theoretical capacity and safe working potential is regarded as a candidate for lithium ion batteries. However, poor electronic conductivity of TiNb 24 O 62 restricts its widely application. Herein, we propose a novel methodology concerned about nitrogen-doped carbon coating to improve the electrochemical performance of TiNb 24 O 62 nanowires. According to a series of analyses, it is found that nitrogen-doped carbon coating plays a key role on improving the electronic conductivity and electrochemical activity of TiNb 24 O 62 nanowires. Meanwhile, both first principles calculations and in-situ XRD technique are applied to realize the structural evolution of nitrogen-doped carbon coated TiNb 24 O 62 nanowires. The obtained results show a high diffusion channel for lithium ions in the lattice of TiNb 24 O 62 and the good electrochemical reversibility of nitrogen-doped carbon coated TiNb 24 O 62 nanowires. In addition, a full lithium ion battery is assembled by using nitrogen-doped carbon coated TiNb 24 O 62 nanowires as anode and LiFePO 4 as cathode. Such a cell can deliver a high capacity, indicative of a great potential for practical applications. Therefore, nitrogen-doped carbon coated TiNb 24 O 62 nanowires can be a promising anode for high-rate lithium ion batteries. Graphical abstract fx1 Highlights • TiNb 24 O 62 nanowires are prepared by an electrospinning method. • Nitrogen-doped carbon is coated on TiNb 24 O 62 nanowires via a novel method. • A reversible capacity of 148.9 mA h g
−1 can be delivered after 900 cycles at 10 C. • First principles calculations are adopted to realize the lithium storage mechanism. • Structural evolution of TiNb 24 O 62 /NC upon cycling is analyzed by in situ XRD. [ABSTRACT FROM AUTHOR]- Published
- 2018
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9. K6Nb10.8O30 groove nanobelts as high performance lithium-ion battery anode towards long-life energy storage.
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Zhu, Haojie, Cheng, Xing, Yu, Haoxiang, Ye, Wuquan, Peng, Na, Zheng, Runtian, Liu, Tingting, Shui, Miao, and Shu, Jie
- Abstract
Abstract Owing to the multiple redox couples of Nb
5+ /Nb4+ and Nb4+ /Nb3+ , Nb-based compounds have attracted great attention to be promising high-capacity anode materials for rechargeable batteries. Here, K 6 Nb 10.8 O 30 groove nanobelts (GNB) are synthesized through heat-treating the adjustable electrospun potassium niobate nanofibers, thereupon the structural change in the lithiation and delithiation is evidently imaged via in situ transmission electron microscopy (TEM). From in situ observations, the K 6 Nb 10.8 O 30 GNB, in virtue of its stability, is ascertained to be adopted as anode material in lithium-ion batteries (LIBs). Evaluated as lithium storage host, GNB outstrip nanowires (NW) in cyclicity and in reversible capacity. Even after 1000 cycles, the retention capacity of K 6 Nb 10.8 O 30 GNB is as high as 69%. Furthermore, the lithium-storage mechanism is also investigated via in situ X-ray diffraction (XRD). It is proved that the phase transition takes place from Li-poor K 6 Nb 10.8 O 30 phase to Li-rich Li 22 K 6 Nb 10.8 O 30 phase via two steps. In addition, the results obtained from ex situ TEM and ex situ X-ray photoelectron spectroscopy (XPS) also prove that the behavior of lithiation and de-lithiation for K 6 Nb 10.8 O 30 GNB is highly reversible, suggesting that it can be a possible anode material. Graphical abstract fx1 Highlights • K 6 Nb 10.8 O 30 groove nanobelts are prepared by electrospinning. • K 6 Nb 10.8 O 30 groove nanobelts show superior performance to nanowires. • A charge capacity of 161.5 mA h g−1 is remained after 1000 cycles. • Structural evolution of K 6 Nb 10.8 O 30 is analyzed by in situ XRD and TEM. • Cycling stability of K 6 Nb 10.8 O 30 is demonstrated by ex situ TEM and XPS. [ABSTRACT FROM AUTHOR]- Published
- 2018
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10. Observation of ZrNb14O37Nanowires as a Lithium Container via In Situ and Ex Situ Techniques for High-Performance Lithium-Ion Batteries
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Li, Yuhang, Zheng, Runtian, Yu, Haoxiang, Cheng, Xing, Liu, Tingting, Peng, Na, Zhang, Jundong, Shui, Miao, and Shu, Jie
- Abstract
Based on the high theoretical capacity and relatively high safety voltage, niobium-based oxides are regarded as promising intercalation-type electrode materials for advanced lithium-ion batteries (LIBs). Here, ZrNb14O37nanowires are fabricated via a facile electrospinning method, presenting a nanoparticle-in-nanowire architecture. As an anode for LIBs, the as-fabricated ZrNb14O37nanowires maintain a capacity of 244.9 mA h g–1at 100 mA g–1and present excellent cycling capability (0.026% of capacity fading per cycle during 1000 cycles) as well as outstanding rate performance. In situ X-ray diffraction measurement is conducted to understand the fundamental reaction mechanism during the lithiation/delithiation process. The ex situ observations, including X-ray photoelectron spectroscopy and transmission electron microscopy, are further performed to provide more lines of evidence of the reaction mechanism. Moreover, the excellent electrochemical performance of the full cell constructed using ZrNb14O37nanowires and LiCoO2suggests that ZrNb14O37nanowires are a promising anode material. This work sheds new light on understanding the lithium storage mechanism and may open new opportunities to develop new anode materials for LIBs.
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- 2019
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11. Development status and future prospect of non-aqueous potassium ion batteries for large scale energy storage
- Author
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Zhang, Jundong, Liu, Tingting, Cheng, Xing, Xia, Maoting, Zheng, Runtian, Peng, Na, Yu, Haoxiang, Shui, Miao, and Shu, Jie
- Abstract
Lithium ion batteries (LIBs) as the mainstream rechargeable batteries are widely used in industrial production and life. However, it is hard to meet the demand in the future due to the lack of lithium resources. At the same time, increasingly scarce lithium resources will increase the cost of LIBs. In contrast, potassium is abundant in the earth's crust, and available researches suggest that rechargeable potassium ion batteries (KIBs) may be a promising substitute for LIBs. In this paper, the research progress of non-aqueous KIBs is reviewed, including cathode materials, anode materials, electrolytes, binders, opportunities and future challenges. Firstly, cathode and anode materials are summarized according to the different reaction types. Secondly, the application and influence of electrolytes and binders for non-aqueous KIBs are also discussed. Moreover, in order to promote the advancement for non-aqueous KIBs, the main future challenges and some solutions are also proposed.
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- 2019
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12. H0.92K0.08TiNbO5Nanowires Enabling High-Performance Lithium-Ion Uptake
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Yuan, Yu, Yu, Haoxiang, Cheng, Xing, Ye, Wuquan, Liu, Tingting, Zheng, Runtian, Long, Nengbing, Shui, Miao, and Shu, Jie
- Abstract
HTiNbO5has been widely investigated in many fields because of its distinctive properties such as good redox activity, high photocatalytic activity, and environmental benignancy. Here, this work reports the synthesis of one-dimensional H0.92K0.08TiNbO5nanowires via simple electrospinning followed by an ion-exchange reaction. The H0.92K0.08TiNbO5nanowires consist of many small “lumps” with a uniform diameter distribution of around 150 nm. Used as an anode for lithium-ion batteries, H0.92K0.08TiNbO5nanowires exhibit high capacity, fast electrochemical kinetics, and high performance of lithium-ion uptake. A capacity of 144.1 mA h g–1can be carried by H0.92K0.08TiNbO5nanowires at 0.5 C in the initial charge, and even after 150 cycles, the reversible capacity can remain at 123.7 mA h g–1with an excellent capacity retention of 85.84%. For H0.92K0.08TiNbO5nanowires, the diffusion coefficient of lithium ions is 1.97 × 10–11cm2s–1, which promotes the lithium-ion uptake effectively. The outstanding electrochemical performance is ascribed to its morphology and the formation of a stable phase during cycling. In addition, the in situ X-ray diffraction and ex situ transmission electron microscopy techniques are applied to reveal its lithium storage mechanism, which proves the structure stability and electrochemical reversibility, thus achieving high-performance lithium-ion uptake. All these advantages demonstrate that H0.92K0.08TiNbO5nanowires can be a possible alternative anode material for rechargeable batteries.
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- 2019
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13. Deep insights into kinetics and structural evolution of nitrogen-doped carbon coated TiNb24O62nanowires as high-performance lithium container
- Author
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Yu, Haoxiang, Cheng, Xing, Zhu, Haojie, Zheng, Runtian, Liu, Tingting, Zhang, Jundong, Shui, Miao, Xie, Ying, and Shu, Jie
- Abstract
TiNb24O62with large theoretical capacity and safe working potential is regarded as a candidate for lithium ion batteries. However, poor electronic conductivity of TiNb24O62restricts its widely application. Herein, we propose a novel methodology concerned about nitrogen-doped carbon coating to improve the electrochemical performance of TiNb24O62nanowires. According to a series of analyses, it is found that nitrogen-doped carbon coating plays a key role on improving the electronic conductivity and electrochemical activity of TiNb24O62nanowires. Meanwhile, both first principles calculations and in-situ XRD technique are applied to realize the structural evolution of nitrogen-doped carbon coated TiNb24O62nanowires. The obtained results show a high diffusion channel for lithium ions in the lattice of TiNb24O62and the good electrochemical reversibility of nitrogen-doped carbon coated TiNb24O62nanowires. In addition, a full lithium ion battery is assembled by using nitrogen-doped carbon coated TiNb24O62nanowires as anode and LiFePO4as cathode. Such a cell can deliver a high capacity, indicative of a great potential for practical applications. Therefore, nitrogen-doped carbon coated TiNb24O62nanowires can be a promising anode for high-rate lithium ion batteries.
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- 2018
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14. K6Nb10.8O30groove nanobelts as high performance lithium-ion battery anode towards long-life energy storage
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Zhu, Haojie, Cheng, Xing, Yu, Haoxiang, Ye, Wuquan, Peng, Na, Zheng, Runtian, Liu, Tingting, Shui, Miao, and Shu, Jie
- Abstract
Owing to the multiple redox couples of Nb5+/Nb4+and Nb4+/Nb3+, Nb-based compounds have attracted great attention to be promising high-capacity anode materials for rechargeable batteries. Here, K6Nb10.8O30groove nanobelts (GNB) are synthesized through heat-treating the adjustable electrospun potassium niobate nanofibers, thereupon the structural change in the lithiation and delithiation is evidently imaged via in situtransmission electron microscopy (TEM). From in situobservations, the K6Nb10.8O30GNB, in virtue of its stability, is ascertained to be adopted as anode material in lithium-ion batteries (LIBs). Evaluated as lithium storage host, GNB outstrip nanowires (NW) in cyclicity and in reversible capacity. Even after 1000 cycles, the retention capacity of K6Nb10.8O30GNB is as high as 69%. Furthermore, the lithium-storage mechanism is also investigated via in situX-ray diffraction (XRD). It is proved that the phase transition takes place from Li-poor K6Nb10.8O30phase to Li-rich Li22K6Nb10.8O30phase viatwo steps. In addition, the results obtained from ex situTEM and ex situX-ray photoelectron spectroscopy (XPS) also prove that the behavior of lithiation and de-lithiation for K6Nb10.8O30GNB is highly reversible, suggesting that it can be a possible anode material.
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- 2018
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15. TiNb2O7 hollow nanofiber anode with superior electrochemical performance in rechargeable lithium ion batteries.
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Yu, Haoxiang, Lan, Hua, Yan, Lei, Qian, Shangshu, Cheng, Xing, Zhu, Haojie, Long, Nengbing, Shui, Miao, and Shu, Jie
- Abstract
Hollow microstructure always exhibits some special properties in the field of electrochemistry. Here, this study reports the rational design and preparation of TiNb 2 O 7 nanofibers with one dimensional hollow structure via co-electrospinning. The as-electrospun TiNb 2 O 7 hollow nanofibers show high intercalation potential, low charge-charge resistance and fast electrochemical kinetics. The electrochemical results exhibit that the TiNb 2 O 7 hollow nanofibers deliver a reversible capacity of 210.1 mAh g −1 after 150 cycles at a current rate of 0.4 C, and 158.4 mAh g −1 after 900 cycles even at a current rate of 10 C with an outstanding capacity retention of 80.6%. The excellent electrochemical performance of nanofibers can be related to the unique morphology of hollow structure. Furthermore, the lithium ions storage mechanism of TiNb 2 O 7 hollow nanofibers is also systematically analyzed, which is related to one two-phase coexistence and two solid-solution processes during the whole charge-discharge cycle. In addition, it is also demonstrated by in situ and ex situ observations that TiNb 2 O 7 hollow nanofibers have outstanding structural stability and electrochemical reversibility. Therefore, the TiNb 2 O 7 hollow nanofibers can be applied as an alternative promising electrode material for the next rechargeable lithium ions batteries. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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16. Sol–Gel Synthesis and in Situ X-ray Diffraction Study of Li3Nd3W2O12as a Lithium Container
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Luo, Minghe, Yu, Haoxiang, Cheng, Xing, Ye, Wuquan, Zhu, Haojie, Liu, Tingting, Peng, Na, Shui, Miao, and Shu, Jie
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In this work, garnet-framework Li3Nd3W2O12as a novel insertion-type anode material has been prepared via a facile sol–gel method and examined as a lithium container for lithium ion batteries (LIBs). Li3Nd3W2O12shows a charge capacity of 225 mA h g–1at 50 mA g–1, and with the current density increasing up to 500 mA g–1, the charge capacity can still be maintained at 186 mA h g–1. After cycling at 500 mA g–1for 500 cycles, Li3Nd3W2O12retains about 85% of its first charge capacity changed from 190.2 to 161 mA h g–1. Furthermore, in situ X-ray diffraction technique is adopted for the understanding of the insertion/extraction mechanism of Li3Nd3W2O12. The full-cell configuration LiFePO4/Li3Nd3W2O12is also assembled to evaluate the potential of Li3Nd3W2O12for practical application. These results show that Li3Nd3W2O12is such a promising anode material for LIBs with excellent electrochemical performance and stable structure.
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- 2018
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17. Impact of Water-Depletion Layer on Transport in Hydrophobic Nanochannels.
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Yuhui He, Makusu Tsutsui, Xiang Shui Miao, and Masateru Taniguchi
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- 2015
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18. TiNb2O7hollow nanofiber anode with superior electrochemical performance in rechargeable lithium ion batteries
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Yu, Haoxiang, Lan, Hua, Yan, Lei, Qian, Shangshu, Cheng, Xing, Zhu, Haojie, Long, Nengbing, Shui, Miao, and Shu, Jie
- Abstract
Hollow microstructure always exhibits some special properties in the field of electrochemistry. Here, this study reports the rational design and preparation of TiNb2O7nanofibers with one dimensional hollow structure via co-electrospinning. The as-electrospun TiNb2O7hollow nanofibers show high intercalation potential, low charge-charge resistance and fast electrochemical kinetics. The electrochemical results exhibit that the TiNb2O7hollow nanofibers deliver a reversible capacity of 210.1mAhg−1after 150 cycles at a current rate of 0.4C, and 158.4mAhg−1after 900 cycles even at a current rate of 10C with an outstanding capacity retention of 80.6%. The excellent electrochemical performance of nanofibers can be related to the unique morphology of hollow structure. Furthermore, the lithium ions storage mechanism of TiNb2O7hollow nanofibers is also systematically analyzed, which is related to one two-phase coexistence and two solid-solution processes during the whole charge-discharge cycle. In addition, it is also demonstrated by in situ and ex situ observations that TiNb2O7hollow nanofibers have outstanding structural stability and electrochemical reversibility. Therefore, the TiNb2O7hollow nanofibers can be applied as an alternative promising electrode material for the next rechargeable lithium ions batteries.
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- 2017
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19. High-Rate Long-Life Pored Nanoribbon VNb9O25Built by Interconnected Ultrafine Nanoparticles as Anode for Lithium-Ion Batteries
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Qian, Shangshu, Yu, Haoxiang, Yan, Lei, Zhu, Haojie, Cheng, Xing, Xie, Ying, Long, Nengbing, Shui, Miao, and Shu, Jie
- Abstract
VNb9O25is a novel lithium storage material, which has not been systematically investigated so far. Via electrospinning technology, VNb9O25samples with two different morphologies, pored nanoribbon and rodlike nanoparticles, are prepared in relatively low temperature and time-saving calcination conditions. It is found that the formation process of different morphologies depends on the control of self-aggregation of the precursor by using different sample collectors. Compared with rodlike VNb9O25(RL-VNb9O25), pored nanoribbon VNb9O25(PR-VNb9O25) can deliver a higher specific capacity, lower capacity loss, and better cyclability. Even cycled at 1000 mA g–1, the reversible capacity of 132.3 mAh g–1is maintained by PR-VNb9O25after 500 cycles, whereas RL-VNb9O25only exhibits a capacity of 102.7 mAh g–1. The enhancement should be attributed to the pored nanoribbon structure with large specific surface area and shorter pathway for lithium ions transport. Furthermore, the lithium ions insertion/extraction process is verified from refinement results of in situX-ray diffraction data, which is associated with a lithium occupation process in type III and VI cavities through tunnels I, II, and III. In addition, high structural stability and electrochemical reversibility are also demonstrated. All of these advantages suggest that PR-VNb9O25is a promising anode material for lithium-ion batteries.
- Published
- 2017
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20. Effect of Sodium-Site Doping on Enhancing the Lithium Storage Performance of Sodium Lithium Titanate
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Wang, Pengfei, Qian, Shangshu, Yi, Ting-Feng, Yu, Haoxiang, Yan, Lei, Li, Peng, Lin, Xiaoting, Shui, Miao, and Shu, Jie
- Abstract
Via Li+, Cu2+, Y3+, Ce4+, and Nb5+dopings, a series of Na-site-substituted Na1.9M0.1Li2Ti6O14are prepared and evaluated as lithium storage host materials. Structural and electrochemical analyses suggest that Na-site substitution by high-valent metal ions can effectively enhance the ionic and electronic conductivities of Na2Li2Ti6O14. As a result, Cu2+-, Y3+-, Ce4+-, and Nb5+-doped samples reveal better electrochemical performance than bare Na2Li2Ti6O14, especially for Na1.9Nb0.1Li2Ti6O14, which can deliver the highest reversible charge capacity of 259.4 mAh g–1at 100 mA g–1among all samples. Even when cycled at higher rates, Na1.9Nb0.1Li2Ti6O14still can maintain excellent lithium storage capability with the reversible charge capacities of 242.9 mAh g–1at 700 mA g–1, 216.4 mAh g–1at 900 mA g–1, and 190.5 mAh g–1at 1100 mA g–1. In addition, ex situ and in situ observations demonstrate that the zero-strain characteristic should also be responsible for the outstanding lithium storage capability of Na1.9Nb0.1Li2Ti6O14. All of this evidence indicates that Na1.9Nb0.1Li2Ti6O14is a high-performance anode material for rechargeable lithium ion batteries.
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- 2016
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21. Chinese herbal medicine for patients with mild to moderate Alzheimer disease based on syndrome differentiation: a randomized controlled trial.
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Lu Yu, Shui-miao Lin, Ru-qian Zhou, Wei-jun Tang, Pin-xian Huang, Ying Dong, Jian Wang, Zhi-hua Yu, Jiu-lin Chen, Li Wei, San-li Xing, Hui-juan Cao, and Hong-bin Zhao
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- 2012
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22. Deep insight into the defect structure, lithium diffusion kinetics and deintercalation study on β-LiVOPO4cathode material by atomistic simulation method
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Xie, Yuting, Gu, Fanpei, Wang, Qinyun, Shui, Miao, and Shu, Jie
- Abstract
•The Li+migration mechanism is determined by DFT together with MD.•Li frenkel defect, Li/V anti-site and Li+vacancies are the main intrinsic defects in the lattice.•The SOC (state of charge) dependency of Li+diffusion coefficients are fully revealed.•Li+intercalation/deintercalation mechanism and phase evolution are determined by cluster expansion.
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- 2022
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23. Comparison of LiVPO4F to Li4Ti5O12as Anode Materials for Lithium-Ion Batteries
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Ma, Rui, Shao, Lianyi, Wu, Kaiqiang, Shui, Miao, Wang, Dongjie, Pan, Jianguo, Long, Nengbing, Ren, Yuanlong, and Shu, Jie
- Abstract
In this paper, we reported on a comparison of LiVPO4F to Li4Ti5O12as anode materials for lithium-ion batteries. Combined with powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, galvanostatic discharge/charge tests and in situ X-ray diffraction technologies, we explore and compare the insertion/extraction mechanisms of LiVPO4F based on the V3+/V2+/V+redox couples and Li4Ti5O12based on the Ti4+/Ti3+redox couple cycled in 1.0–3.0 V and 0.0–3.0 V. The electrochemical results indicate that both LiVPO4F and Li4Ti5O12are solid electrolyte interphase free materials in 1.0–3.0 V. The insertion/extraction mechanisms of LiVPO4F and Li4Ti5O12are similar with each other in 1.0–3.0 V as proved by in situ X-ray diffraction. It also demonstrates that both samples possess stable structure in 0.0–3.0 V. Additionally, the electrochemical performance tests of LiVPO4F and Li4Ti5O12indicate that both samples cycled in 0.0–3.0 V exhibit much higher capacities than those cycled in 1.0–3.0 V but display worse cycle performance. The rate performance of Li4Ti5O12far exceeds that of LiVPO4F in the same electrochemical potential window. In particular, the capacity retention of Li4Ti5O12cycled in 1.0–3.0 V is as high as 98.2% after 20 cycles. By contrast, Li4Ti5O12is expected to be a candidate anode material considering its high working potential, structural zero-strain property, and excellent cycle stability and rate performance.
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- 2013
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24. Finite Element Simulation and Respond Surface Optimization on Stretch Bending of Square Tube Aluminum Profile
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Liang, Ke Feng, Chen, Ze Zhong, Wang, Shui Miao, and Zheng, Jie
- Abstract
With the adoption of ABAQUS/Explicit as the simulation platform, a 3D finite element model has been established to simulate the stretch bending of square tube aluminum profile which is used as the door frame of fork lifter. Four characteristic points are put forward to evaluate the distortion of cross section during deformation, and the influence to distortion of cross section from some key parameters, such as bending radius and thickness of profile, is analyzed. An orthogonal experiment is designed to evaluate the influence to deformation from other forming parameters, including preload, fill rally and filling pressure which occurred in the stretch bending process. Then neural network based response surface method and genetic algorithm are used to optimize the parameters mentioned above. Finite element simulation proved that the optimized result is valuable to reduce the distortion of cross section of profile and improve formability.
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- 2011
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25. The Preparation of Nano-Sized Lead Sulfide in High Power Pulse Ultrasonic Reactor
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Shui, Miao, Shu, Jie, Ren, Yuan Long, and Zhang, Rui Feng
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This article proposed a liquid phase method to synthesize the small, even sized nano lead sulfide sol in high power (2KW) pulse ultrasonic reactor, which is designed by our research group. The characteristics of this method are the short time, the small granularity, the equal particle size and the mild synthesis condition. The particle size of lead sulfide sol is about 7~8 nanometer and the size distribution is narrow. Ultraviolet and visible spectroscopy shows that the absorption limit of this lead sulfide sol is about 670nm. Compared with the normal sized lead sulfide, the absorption limit is greatly blue shifted because of the quantum size effect.
- Published
- 2011
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26. Surface Behaviors of Conductive Acetylene Black for Lithium-Ion Batteries at Extreme Working Temperatures
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Shu, Jie, Shui, Miao, Huang, Fengtao, Xu, Dan, Ren, Yuanlong, Hou, Lu, Cui, Jia, and Xu, Jinjin
- Abstract
The surface physical and chemical behaviors of conductive additive acetylene black (AB) are studied after the samples are cycled at different working temperatures (−20, 20, and 60 °C). Working at low temperature (−20 °C), AB shows high polarization and poor electrochemical property. In addition, plenty of inorganic compounds are formed on the surface of AB. For comparison, the surface film on AB after being worked at 60 °C is comprised of an outer organic layer and an inner inorganic layer. Moreover, it consumes large electrical energy and results in irreversible trapped lithium for surface film formation. Furthermore, much more organic components can induce lower thermal stability of conductive additive. During repeated electrochemical cycles, the surface structure of AB experiences a series of changes of surface electrolyte decomposition products. It is found that the organic polymer in outer layer will decompose into other stable species, and partial surface fluorides in the inner layer will transform into other fluorides. The working temperature has a great effect on the final transformation products.
- Published
- 2011
- Full Text
- View/download PDF
27. A New Look at Lithium Cobalt Oxide in a Broad Voltage Range for Lithium-Ion Batteries
- Author
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Shu, Jie, Shui, Miao, Huang, Fengtao, Ren, Yuanlong, Wang, Qingchun, Xu, Dan, and Hou, Lu
- Abstract
The electrochemical behaviors and lithium-storage mechanism of LiCoO2in a broad voltage window (1.0−4.3 V) are studied by charge−discharge cycling, XRD, XPS, Raman, and HRTEM. It is found that the reduction mechanism of LiCoO2with lithium is associated with the irreversible formation of metastable phase Li1+xCoII IIIO2−yand then the final products of Li2O and Co metal. During the charging process, the Li2O/Co mixture can be oxidized into CoO, and then the Li2O/CoO mixture can result in the formation of Co3O4in the higher-voltage region. LixCoOyis the final product when the active material is charged to 4.3 V. During the subsequent cycles, the lithium uptake/release reactions are related to the reversible conversion of Co ↔ CoO ↔ Co3O4↔ LixCoOy.
- Published
- 2010
- Full Text
- View/download PDF
28. Controllable defect engineering enhanced bond strength for stable electrochemical energy storage.
- Author
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Liu, Tingting, Peng, Na, Zhang, Xikun, Zheng, Runtian, Xia, Maoting, Yu, Haoxiang, Shui, Miao, Xie, Ying, and Shu, Jie
- Abstract
Transition metal dichalcogenides (TMDs) with layered structure are regarded as a potential electrode material for high-performance energy storage devices, while intrinsic low electrical conductivity causes poor electrochemical performance. As we know, the change of atomic structure for TMDs can lead to the improvement of electrochemical properties. In this work, defect chemistry is employed to achieve this purpose. TiS 2 as a typical electrode material is chosen to complete the study of controllable defect engineering. Theoretical calculations and experimental analysis confirm that concentration and species of defects can be controlled via adjusting the experimental conditions. A series of concentrations of sulfur vacancies are introduced in TiS 2 by annealing methods. The introduction of sulfur vacancies enhances bond strength of Ti-S bonds near the defect area and improves electronic structure. Benefiting from the positive effect of sulfur vacancies, the electrochemical characteristics of TiS 2 are greatly optimized, including cycle ability and dynamic characteristics. In addition, it is found that the improvement of electrochemical performance is closely related to the concentration of defects. These results reveal that controllable defect engineering may be a fascinating strategy to promote the advancement of TMDs in energy storage application. ga1 • Defect engineering can be controlled by changing the experimental conditions. • S vacancy enhances the bond strength of Ti-S bonds. • Defect concentration is related to electrochemical performance. • The capacity retention of TiS 2−x is twice that of the pristine one after 500 cycles. • S vacancy can enhance electronic conductivity and promote ions transport. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
29. Functional cation defects engineering in TiS2 for high-stability anode.
- Author
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Liu, Tingting, Zhang, Xikun, Xia, Maoting, Yu, Haoxiang, Peng, Na, Jiang, Cheng, Shui, Miao, Xie, Ying, Yi, Ting-Feng, and Shu, Jie
- Abstract
In recent years, potassium-ion batteries have been extensively studied as an alternative for lithium ion batteries, thus developing electrode materials for them has become important. TiS 2 as a typical electrode material is chosen due to the unique layered structure. However, 1T-TiS 2 (tetragonal (T)) is a metastable metallic phase, leading to poor long-term stability for alkali metal ions batteries. In order to alleviate this shortcoming, the functional cation defects are generated on the surface of TiS 2 via thermal annealing method in this work. Introduced titanium vacancies effectively improve cycle ability and enhance kinetic performance. The microscopic stress and strain can be weakened due to the existence of defects, demonstrating that defects can alleviate volume expansion during the ion intercalation process to maintain structural stability, thus obtaining excellent cycle ability. Meanwhile, titanium vacancies also can regulate alkali metal ions insertion sites to stabilize crystal structure. In addition, titanium vacancies could be conducive to the improvement of kinetics, including charge-transfer resistance and ions transport. These features are verified by electrochemical analysis combined with density functional theory calculations. Therefore, functional cation defects engineering as a facile and effective strategy can be advanced in various energy storage applications. Image 1 • Functional cation defects are generated via a thermal annealing method. • The cycle ability of potassium-ion batteries is doubled by functional cation defects. • Functional cation defects can affect the selection of insertion sites based on the different ionic radius. • Functional cation defects can enhance electronic conductivity and promote ions transport. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
30. Review on niobium-based chalcogenides for electrochemical energy storage devices: Application and progress.
- Author
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Zhang, Xikun, Peng, Na, Liu, Tingting, Zheng, Runtian, Xia, Maoting, Yu, Haoxiang, Chen, Shi, Shui, Miao, and Shu, Jie
- Abstract
Electrochemical energy storage devices are currently an ideal tool to meet the energy needs of the people. It has been certified that niobium-based chalcogenides are generally used as the electrode materials for electrochemical energy storage devices due to their unique physical and chemical properties. This review summarizes the different synthesis methods and applications about the various niobium-based chalcogenides. In addition, in view of the existing problems of the niobium-based chalcogenides, many modification methods to improve the electrochemical properties of electrode materials are summarized, such as coating conductive matrixes, preparing composite materials, preparing porous or nanometer materials, and doping hetero atoms, etc. Finally, while summarizing the progress in recent years, the current bottlenecks and possible development directions in the future have also been proposed. Image 1 • Research progress of Nb-based chalcogenides in electrochemical energy storage is summarized. • The shortcomings of Nb-based chalcogenides as electrode materials are presented. • The measures to improve the performance of Nb-based chalcogenides are summarized. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
31. Controllable defect engineering enhanced bond strength for stable electrochemical energy storage
- Author
-
Liu, Tingting, Peng, Na, Zhang, Xikun, Zheng, Runtian, Xia, Maoting, Yu, Haoxiang, Shui, Miao, Xie, Ying, and Shu, Jie
- Abstract
Transition metal dichalcogenides (TMDs) with layered structure are regarded as a potential electrode material for high-performance energy storage devices, while intrinsic low electrical conductivity causes poor electrochemical performance. As we know, the change of atomic structure for TMDs can lead to the improvement of electrochemical properties. In this work, defect chemistry is employed to achieve this purpose. TiS2as a typical electrode material is chosen to complete the study of controllable defect engineering. Theoretical calculations and experimental analysis confirm that concentration and species of defects can be controlled via adjusting the experimental conditions. A series of concentrations of sulfur vacancies are introduced in TiS2by annealing methods. The introduction of sulfur vacancies enhances bond strength of Ti-S bonds near the defect area and improves electronic structure. Benefiting from the positive effect of sulfur vacancies, the electrochemical characteristics of TiS2are greatly optimized, including cycle ability and dynamic characteristics. In addition, it is found that the improvement of electrochemical performance is closely related to the concentration of defects. These results reveal that controllable defect engineering may be a fascinating strategy to promote the advancement of TMDs in energy storage application.
- Published
- 2021
- Full Text
- View/download PDF
32. Functional cation defects engineering in TiS2for high-stability anode
- Author
-
Liu, Tingting, Zhang, Xikun, Xia, Maoting, Yu, Haoxiang, Peng, Na, Jiang, Cheng, Shui, Miao, Xie, Ying, Yi, Ting-Feng, and Shu, Jie
- Abstract
In recent years, potassium-ion batteries have been extensively studied as an alternative for lithium ion batteries, thus developing electrode materials for them has become important. TiS2as a typical electrode material is chosen due to the unique layered structure. However, 1T-TiS2(tetragonal (T)) is a metastable metallic phase, leading to poor long-term stability for alkali metal ions batteries. In order to alleviate this shortcoming, the functional cation defects are generated on the surface of TiS2via thermal annealing method in this work. Introduced titanium vacancies effectively improve cycle ability and enhance kinetic performance. The microscopic stress and strain can be weakened due to the existence of defects, demonstrating that defects can alleviate volume expansion during the ion intercalation process to maintain structural stability, thus obtaining excellent cycle ability. Meanwhile, titanium vacancies also can regulate alkali metal ions insertion sites to stabilize crystal structure. In addition, titanium vacancies could be conducive to the improvement of kinetics, including charge-transfer resistance and ions transport. These features are verified by electrochemical analysis combined with density functional theory calculations. Therefore, functional cation defects engineering as a facile and effective strategy can be advanced in various energy storage applications.
- Published
- 2020
- Full Text
- View/download PDF
33. Review on niobium-based chalcogenides for electrochemical energy storage devices: Application and progress
- Author
-
Zhang, Xikun, Peng, Na, Liu, Tingting, Zheng, Runtian, Xia, Maoting, Yu, Haoxiang, Chen, Shi, Shui, Miao, and Shu, Jie
- Abstract
Electrochemical energy storage devices are currently an ideal tool to meet the energy needs of the people. It has been certified that niobium-based chalcogenides are generally used as the electrode materials for electrochemical energy storage devices due to their unique physical and chemical properties. This review summarizes the different synthesis methods and applications about the various niobium-based chalcogenides. In addition, in view of the existing problems of the niobium-based chalcogenides, many modification methods to improve the electrochemical properties of electrode materials are summarized, such as coating conductive matrixes, preparing composite materials, preparing porous or nanometer materials, and doping hetero atoms, etc. Finally, while summarizing the progress in recent years, the current bottlenecks and possible development directions in the future have also been proposed.
- Published
- 2019
- Full Text
- View/download PDF
34. Understanding the lithium transport mechanism in monoclinic Li3V2(PO4)3 cathode material by atomistic simulation.
- Author
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Luo, Yanxiang, Shui, Miao, and Shu, Jie
- Abstract
The superimposed Li
+ trajectory of a 2 × 2 × 2 super cell at 1000 K at all time frames (all together 2000 snapshots) viewed from the b and c axis, demonstrating the migration mechanism of Li+ . • The superimposed Li+ trajectory offers an intuitive, reliable image of the Li+ migration in the lattice. • Reveal clearly three migration paths of lithium ions. • Li+ diffusion mainly takes place on series of wave shaped planes without intersections extending infinitely toward a and c directions. In this work, atomistic simulation method based on core shell model is applied to observe the concerted motion of lithium ions in the perfect lattice of Li 3 V 2 (PO 4) 3 cathode material. The simulation is carried out at a series of increasingly elevated temperatures in a super cell containing 8 unit cells. The superimposed Li+ trajectory at all timeframes offers an intuitive, reliable image of the Li+ migration in crystal lattice. It reveals Li+ diffusion mainly takes place on series of wave shaped planes without intersections extending infinitely toward a and c directions, or in a word, two dimensionally. The complete migration path along the c axis is supposed to be described as transferring through alternating 4a Li2 and 4a Li3 atoms. The Li+ migration along the a axis follows the mutually connected Li-O n polyhedra chain. Li+ migration along the a axis owns the smallest energy barrier 0.44 eV. The estimated diffusion coefficient at RT is 3.2 × 10−11 cm2 ·s−1 . The hopping between two Li-O n polyhedra chains via two vertex sharing Li2-O 5 polyhedron and Li1-O 5 polyhedron also makes diffusion along the b axis possible at higher temperature. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
35. Clinical study on treatment of Alzheimer’s disease from the viewpoint of Xin and Shen
- Author
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Shui-miao, Lin, Jian, Wang, Ru-qian, Zhou, and Zhi-hua, Yu
- Published
- 2003
- Full Text
- View/download PDF
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