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12. LiNO3‐Based Electrolytes via Electron‐Donation Modulation for Sustainable Nonaqueous Lithium Rechargeable Batteries.

Author

Chen, Hui, Chen, Kean, Luo, Laibing, Liu, Xingwei, Wang, Zhi, Zhao, Along, Li, Hui, Ai, Xinping, Fang, Yongjin, and Cao, Yuliang

Subjects
LITHIUM cells, STORAGE batteries, POLYELECTROLYTES, ELECTROLYTES, THERMAL instability, IONIC conductivity, LITHIUM-ion batteries
Abstract

LiPF6 as a dominant lithium salt of electrolyte is widely used in commercial rechargeable lithium‐ion batteries due to its well‐balanced properties, including high solubility in organic solvents, good electrochemical stability, and high ionic conductivity. However, it suffers from several undesirable properties, such as high moisture sensitivity, thermal instability, and high cost. To address these issues, herein, we propose an electron‐donation modulation (EDM) rule for the development of low‐cost, sustainable, and electrochemically compatible LiNO3‐based electrolytes. We employ high donor‐number solvents (HDNSs) with strong electron‐donation ability to dissolve LiNO3, while low donor‐number solvents (LDNSs) with weak electron‐donation ability are used to regulate the solvation structure to stabilize the electrolytes. As an example, we design the LiNO3‐DMSO@PC electrolyte, where DMSO acts as an HDNS and PC serves as an LDNS. This electrolyte exhibits excellent electrochemical compatibility with graphite anodes, as well as the LiFePO4 and LiCoO2 cathodes, leading to stable cycling over 200 cycles. Through spectroscopy analyses and theoretical calculation, we uncover the underlying mechanism responsible for the stabilization of these electrolytes. Our findings provide valuable insights into the preparation of LiNO3‐based electrolytes using the EDM rule, opening new avenues for the development of advanced electrolytes with versatile functions for sustainable rechargeable batteries. [ABSTRACT FROM AUTHOR]

Published
2024
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23. W‐Doping Induced Efficient Tunnel‐to‐Layered Structure Transformation of Na 0.44 Mn 1‐xWxO 2 : Phase Evolution, Sodium‐Storage Properties, and Moisture Stability

Author

Ding, Qin, primary, Zheng, Wanhao, additional, Zhao, Along, additional, Zhao, Yanan, additional, Chen, Kean, additional, Zhou, Xi, additional, Zhang, Haiyan, additional, Li, Qingyu, additional, Ai, Xinping, additional, Yang, Hanxi, additional, Fang, Yongjin, additional, and Cao, Yuliang, additional

Published
2023
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24. Towards extreme fast charging of 4.6 V LiCoO2 via mitigating high-voltage kinetic hindrance

Author

Tang, Yu, primary, Zhao, Jun, additional, Zhu, He, additional, Ren, Jincan, additional, Wang, Wei, additional, Fang, Yongjin, additional, Huang, Zhiyong, additional, Yin, Zijia, additional, Huang, Yalan, additional, Zhang, Binghao, additional, Yang, Tingting, additional, Li, Tianyi, additional, Gallington, Leighanne C., additional, Lan, Si, additional, Ren, Yang, additional, and Liu, Qi, additional

Published
2023
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32. W‐Doping Induced Efficient Tunnel‐to‐Layered Structure Transformation of Na0.44Mn1‐xWxO2: Phase Evolution, Sodium‐Storage Properties, and Moisture Stability.

Author

Ding, Qin, Zheng, Wanhao, Zhao, Along, Zhao, Yanan, Chen, Kean, Zhou, Xi, Zhang, Haiyan, Li, Qingyu, Ai, Xinping, Yang, Hanxi, Fang, Yongjin, and Cao, Yuliang

Subjects
TRANSITION metal oxides, PHASE transitions, LIGHTWEIGHT construction, STRUCTURAL engineering, STRUCTURAL stability, ENERGY density
Abstract

Na0.44MnO2 is a promising cathode material for sodium‐ion batteries owing to its excellent cycling stability and low cost. However, insufficient sodium storage sites still hinder its practical applications. Herein, a facile strategy to induce the efficient structural transformation from the tunnel to the layered type of Na0.44MnO2 by trace W‐doping for the first time is reported. The W‐doping not only enriches the sodium storage sites but also improves the cycling performance. As a result, the phase‐pure P2‐Na0.44Mn0.99W0.01O2 demonstrates an enhanced reversible specific capacity of 195.5 mAh g−1 and energy density of 517 Wh kg−1 at 0.1 C, accompanying superior cycling stability with capacity retention of 80% over 200 cycles. Moreover, the W‐doped samples show high structure stability in a moist atmosphere and can still maintain the original electrochemical performance after water treatment. In situ and ex situ characterizations reveal the enhanced structural stability of the P2‐Na0.44Mn0.99W0.01O2 electrodes. This work provides a facile strategy on the structural engineering of transition metal oxides to induce the tunnel‐to‐layered structure transformation and could shed light on the design and construction of stable and high‐capacity cathode materials. [ABSTRACT FROM AUTHOR]

Published
2023
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50. A ternary Fe₁₋ₓS@Porous carbon nanowires/reduced graphene oxide hybrid film electrode with superior volumetric and gravimetric capacities for flexible sodium ion batteries

Author

Liu, Yang, Fang, Yongjin, Zhao, Zhiwei, Yuan, Changzhou, Lou, David Xiong Wen, and School of Chemical and Biomedical Engineering

Subjects
Flexible Electrode, Chemical engineering [Engineering], Anode
Abstract

Smart construction of ultraflexible electrodes with superior gravimetric and volumetric capacities is still challenging yet significant for sodium ion batteries (SIBs) toward wearable electronic devices. Herein, a hybrid film made of hierarchical Fe₁₋ₓS-filled porous carbon nanowires/reduced graphene oxide (Fe₁₋ₓS@PCNWs/rGO) is synthesized through a facile assembly and sulfuration strategy. The resultant hybrid paper exhibits high flexibility and structural stability. The multidimensional paper architecture possesses several advantages, including rendering an efficient electron/ion transport network, buffering the volume expansion of Fe₁₋ₓS nanoparticles, mitigating the dissolution of polysulfides, and enabling superior kinetics toward efficient sodium storage. When evaluated as a self-supporting anode for SIBs, the Fe₁₋ₓS@PCNWs/rGO paper electrode exhibits remarkable reversible capacities of 573–89 mAh g⁻¹ over 100 consecutive cycles at 0.1 A g⁻¹ with areal mass loadings of 0.9–11.2 mg cm⁻² and high volumetric capacities of 424–180 mAh cm⁻³ in the current density range of 0.2–5 A g⁻¹. More competitively, a SIB based on this flexible Fe₁₋ₓS@PCNWs/rGO anode demonstrates outstanding electrochemical properties, thus highlighting its enormous potential in versatile flexible and wearable applications.

Published
2019

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