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26 results on '"Zhou, Luozeng"'

8. Synergistic Effect of Bis(2,2,2-trifluoroethyl) Carbonate and Succinonitrile in Suppressing the Dissolution of Nickel for Performance Improvement of Nickel-Rich Lithium Metal Batteries

Author

Zhou, Luozeng, primary, Qian, Siyi, additional, Yang, Cheng, additional, Han, Tingting, additional, Song, Yuanzhe, additional, Jiang, Yuzhuo, additional, Zhang, Huahui, additional, Zhang, Jianqin, additional, Li, Linsen, additional, Liu, Jie, additional, and Qian, Tao, additional

Published
2022
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11. Shape-controlled synthesis of planar PtPb nanoplates for highly efficient methanol electro-oxidation reaction

Author

Lei Chen, Jialu Huang, Yaqin Zhou, Xiaolei Yuan, Hongbin Lu, Jin Wang, Yang Wang, Yong Yao, and Zhou Luozeng

Subjects
Materials science, Metals and Alloys, Diethylene glycol, Nanoparticle, General Chemistry, Electrolyte, Redox, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Solvent, chemistry.chemical_compound, Planar, Nanocrystal, chemistry, Chemical engineering, Materials Chemistry, Ceramics and Composites, Methanol
Abstract

In this work, novel insights into the influence of different nanocrystal structures on the electrocatalytic oxidation of methanol are reported. Herein, we have successfully prepared high-yield PtPb nanoplates in the diethylene glycol (DEG) solvent. The as-obtained PtPb nanoplates with a large surface area of the (102) facet show higher MOR activity and superior durability in alkaline electrolyte compared with both zero-dimensional PtPb nanoparticles and commercial Pt/C. Further chronoamperometric (CA) measurements and discrete Fourier transform (DFT) calculations indicate that the PtPb nanoplates possess much better operation durability and CO tolerance due to the negative adsorption energy of the (102) facet.

Published
2020

18. Interface chemical reconstruction with residual lithium compounds on nickel-rich cathode by nonstoichiometrical MoO3-xcoating enables high stability

Author

Zhou, Luozeng, Huang, Sipeng, Han, Tingting, Peng, Yiting, Cai, Feipeng, Xu, Tongtong, Du, Jincheng, Feng, Zhenhe, Li, Linsen, and Xu, Qunjie

Abstract

The layered lithium nickel-rich cathodes have become one of the most promising candidates for next-generation lithium-ion batteries with high energy density, However, the nickel-rich cathode suffers from a rapid decay of capacity due to their intrinsic instability and undesirably residual lithium compounds originated from LiNiO2structural changes on the surface, hindering large-scale commercial application. Herein, a continuous and uniform oxygen vacancy enriched-MoO3-xcoating was successfully synthesized and reacted residual lithium compounds as a functional layer on the cathode. Such chemically reconstructed coating (Li2MoO4) strategy endows the 1 wt% MoO3-xcoated NCA cathode with a fast Li+ions transport and enhanced structural stability, leading to an outstanding discharge capacity of 214.0 mAh g−1at 0.1C (1C = 270 mA g−1), a better capacity retention of 80.3 % after 120 cycles at 0.5C, and an excellent high rate capability of 120 mAh g−1at 5C cycled in voltage range of 2.75 V–4.3 V. This work provides an effective strategy to modulate surface structure towards advanced Ni-rich cathodes for high-performance lithium-ion batteries.

Published
2024
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24. Synthesis, characterization and electrochemical performance of Li[Li0.2Mn0.54Ni0.13Co0.13]O2cathode materials for lithium-ion batteries

Author

Xiaolei Yuan, Zhou Luozeng, Yongyao Xia, Jin Xue, and Qunjie Xu

Subjects
Materials science, Scanning electron microscope, General Chemical Engineering, Oxalic acid, Inorganic chemistry, chemistry.chemical_element, Lithium-ion battery, Dielectric spectroscopy, law.invention, chemistry.chemical_compound, chemistry, Chemical engineering, law, Electrochemistry, Lithium, Calcination, Cyclic voltammetry, Sol-gel
Abstract

The layered Li-rich Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode material is successfully synthesized via an optimized sol–gel method. With oxalic acid instead of citric acid as the chelating agent, the amount of chelating agent used in this experiment is only 36% of the traditional weight. Segmented sintering method is adopted to decrease the calcination temperature and reduce the calcination time. X-ray diffraction spectrometry (XRD) and scanning electron microscopy (SEM) are used to characterize the structure and micromorphology of the material. Meanwhile, charge–discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are employed to explore its electrochemical performance. Our results demonstrate that Li[Li0.2Mn0.54Ni0.13Co0.13]O2 electrode delivers a high reversible capacity of 277.3 mAh g−1 and keeps excellent capacity retention of 98.4% after 50 cycles when tested at a 0.1 C rate within the potential range of 2.0–4.8 V at room temperature.

Published
2013

25. Synthesis, characterization and electrochemical performance of Li[Li0.2Mn0.54Ni0.13Co0.13]O2cathode materials for lithium-ion batteries.

Author

Jin, Xue, Xu, Qunjie, Yuan, Xiaolei, Zhou, Luozeng, and Xia, Yongyao

Subjects
*ELECTROCHEMISTRY, *LITHIUM compounds, *CHEMICAL synthesis, *PERFORMANCE of cathodes, *LITHIUM-ion batteries, *SOL-gel processes, *CITRIC acid, *X-ray diffraction, *TEMPERATURE effect
Abstract

Abstract: The layered Li-rich Li[Li0.2Mn0.54Ni0.13Co0.13]O2 cathode material is successfully synthesized via an optimized sol–gel method. With oxalic acid instead of citric acid as the chelating agent, the amount of chelating agent used in this experiment is only 36% of the traditional weight. Segmented sintering method is adopted to decrease the calcination temperature and reduce the calcination time. X-ray diffraction spectrometry (XRD) and scanning electron microscopy (SEM) are used to characterize the structure and micromorphology of the material. Meanwhile, charge–discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are employed to explore its electrochemical performance. Our results demonstrate that Li[Li0.2Mn0.54Ni0.13Co0.13]O2 electrode delivers a high reversible capacity of 277.3mAhg−1 and keeps excellent capacity retention of 98.4% after 50 cycles when tested at a 0.1C rate within the potential range of 2.0–4.8V at room temperature. [Copyright &y& Elsevier]

Published
2013
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26. Radio Frequency Magnetron Sputtering of GdBa2Cu3O7 - δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates.

Author

Wang Y, Li Z, Liu Y, Li Y, Liu L, Xu D, Luo X, Gao T, Zhu Y, Zhou L, and Xu J

Subjects
Crystallization, Surface Properties, X-Ray Diffraction, Magnets, Oxides chemistry, Radio Waves, Strontium chemistry, Titanium chemistry
Abstract

Here, we demonstrate a method of coating ferromagnetic La0.67Sr0.33MnO3 (LSMO) nanoparticles on (001) SrTiO3 (STO) single-crystal substrates by radio frequency (RF) magnetron sputtering. LSMO nanoparticles were deposited with diameters from 10 to 20 nm and heights between 20 and 50 nm. At the same time, (Gd) Ba2Cu3O7-δ ((Gd) BCO) films were fabricated on both undecorated and LSMO nanoparticle decorated STO substrates using RF magnetron sputtering. This report also describes the properties of GdBa2Cu3O7-δ/ La0.67Sr0.33MnO3 quasi-bilayer films structures (e.g., crystalline phase, morphology, chemical composition); magnetization, magneto-transport, and superconducting transport properties were also evaluated.

Published
2019
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