Search

Your search keyword '"Xiao, Shunhua"' showing total 165 results
Start Over Author "Xiao, Shunhua"
165 results on '"Xiao, Shunhua"'

19. A Mo/PANI co-modified ultra-high nickel NCM9622 cathode composite with excellent cycle stability and high-rate performance for power batteries.

Author

Huang, Jinfu, Zhang, Liang, Tang, Hongyu, Huang, Shengyi, Tang, Yang, Ma, Jianyao, Huang, Bin, Li, Yanwei, Sun, Yiling, Xiao, Shunhua, and Wang, Renheng

Abstract

Ultra-high nickel layered cathode materials with very high specific capacity are the future direction of power battery development, but they also face many challenges such as poor cycling stability and high-rate performance. In this paper, we adopt an effective Mo/PANI co-modification strategy on a LiNi0.96Co0.02Mn0.02O2 (NCM9622) cathode material and achieve excellent electrochemical performances. The optimized modified NCM9622 cathode material can reach 209.3 mA h g−1 with an upper cut-off voltage of 4.4 V at 1C, and its capacity retention reaches 95.7% after 100 cycles, which exceeds that of similar materials reported so far. In addition, the material also has outstanding high-rate properties, and its discharge specific capacity reaches 167.1 mA h g−1 at 10C. The excellent electrochemical properties are well demonstrated by the results of Li+ migration barriers and electronic density of states (DOS) calculated by density functional theory (DFT). We believe that the cooperative modification strategy of high-valence ion doping and conductive polymer coating will provide technical support for solving the key problems of ultra-high nickel cathode materials. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

38. 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
Full Text
View/download PDF

41. 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
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results