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157 results on '"Xiao, Shunhua"'

35. Co‐Doping of Al3+ and Ti4+ and Electrochemical Properties of LiNiO2 Cathode Materials for Lithium‐Ion Batteries.

Author

Wu, Jinmei, Yang, Jianwen, Zheng, Jiawei, Wang, Mengwen, Li, Shengxian, Huang, Bin, Li, Yanwei, Zhu, Qing, Chen, Quanqi, Xiao, Shunhua, and Liu, Botian

Subjects
LITHIUM-ion batteries, CATHODES, SOL-gel processes, DIFFUSION coefficients, PHASE transitions
Abstract

LiNiO2 cathode material for lithium‐ion batteries has the advantages of high specific capacity, abundant resources, and low cost, but it suffers from difficulties in preparation, structural instability, and serious capacity decay. In this work, highly pure and layered structural LiNi0.95AlaTi0.05‐aO2 (a=0, 0.025, 0.05) cathode materials were synthesized by a simply sol‐gel method. The cation mixing of Ni2+ and Li+, structural deterioration, irreversible conversion between H2 and H3 phases and unstable surface and CEI (Cathode‐electrolyte interface) film can be effectively suppressed by co‐doping with Al3+ and Ti4+. A preferred LiNi0.95Al0.025Ti0.025O2 sample provides a discharge specific capacity of 223 mAh g−1 at 0.1 C and 148.32 mAh g−1 at 5 C, a capacity retention of 72.7 % after 300 cycles at 1 C and a Li+ diffusion coefficient of about 2.0×10−9 cm2 s−1. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Ultra-high nickel cobalt-free layered cathode material NM90 for power batteries modified collaboratively by La2O3 coating and La3+ doping.

Author

Peng, Jiaqi, Wei, Yuanyuan, Hu, Bin, Zhang, Liang, Huang, Jinfu, Tang, Hongyu, Huang, Bin, Li, Yanwei, Chen, Shaojun, and Xiao, Shunhua

Abstract

Due to the urgency of developing high energy density cathode materials in power batteries, as well as the high price and environmental unfriendliness of cobalt, researchers are working on ultra-high nickel low cobalt and ultra-high nickel cobalt-free layered cathode materials. However, the poor cyclic stability and rate performance of this material resulted from structural instability and severe surface/interface side reactions during cycling seriously hinder its practical application. In this paper, LiNi0.9Mn0.1O2 (NM90) cathode material is modified by La2O3 coating, and La3+ doping caused by thermal diffusion is achieved simultaneously. The synergistic enhancement of the two modifications can effectively improve the layered structure and reduce surface/interface side reactions. The dual-modified material shows good structural stability, the La2O3 coating does not fall off and the active material does not appear fragmentation and collapse after 100 cycles. At the same time, the dual-modified material also shows excellent electrochemical performance, with a capacity retention of 83.19% after 100 cycles at 1 C and a reversible capacity of 129.9 mAh g−1 at 10 C. The electrochemical mechanism reveals that the dual-modified material effectively reduces the charge transfer resistance and greatly increases the Li+ diffusion coefficient. It will provide useful reference and technical support for the research of other electrode materials. The NM90 and La2O3-coated NM90 particles have similar spherical morphology and are formed by the agglomeration of many primary particles; the surface of NM90 material is evenly coated by La2O3 and No obvious boundary between La2O3 and NM90 materials is found; LiNi0.9Mn0.1O2 cathode material coated by 1wt% La2O3 has the best cycle stability. [ABSTRACT FROM AUTHOR]

Published
2023
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46. Electrochemical Performance and Behavior Mechanism for Zn/LiFePO4 Battery in a Slightly Acidic Aqueous Electrolyte.

Author

Liu, Xinxin, Xiong, Weixiong, Zheng, Jiawei, Wu, Jinmei, Huang, Bin, Zhu, Qing, Li, Yanwei, Xiao, Shunhua, Chen, Quanqi, Yang, Jianwen, and Yang, Zhaoling

Subjects
AQUEOUS electrolytes, ZINC ions, SURFACE reactions, DIFFUSION coefficients, AQUEOUS solutions, LITHIUM cells, ENERGY storage, ELECTROLYTES
Abstract

The electrochemical performances and process mechanisms of Zn/LiFePO4 cells in a slightly acidic 1.9 m Li2SO4–0.5 m ZnSO4 aqueous solution were investigated. The results showed that the hydrogen depletion side reaction on the surface of the zinc sheet led to an increase in pH of the electrolyte and fluctuations in specific capacity of the cells, and that the dissolution of Fe2+ ions and the lamination of LiFePO4 particles resulted in a decrease in the specific capacity of the cells. At pH 5.0, the initial discharge specific capacity of the Zn/LiFePO4 cell was about 120.0 mAh g−1 at 0.25 C, about 64.4 mAh g−1 at 3 C, with about 60.9 % capacity retention rate after 200 cycles at 1 C, and the Li+ ions diffusion coefficient was about 7.75×10−12 cm2 s−1. [ABSTRACT FROM AUTHOR]

Published
2022
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