Constructing electrochemically stable single crystal Ni-rich cathode material via modification with high valence metal oxides  

作　　者：Hancheng Shi Jiongzhi Zheng Tao Wan Hongqiang Wang Zeping Wen Fenghua Zheng Mingru Su Aichun Dou Yu Zhou Ahmad Naveed Panpan Zhang Hailong Wang Ruiqiang Guo Yunjian Liu Dewei Chu 

机构地区：[1]School of Material Science and Engineering,Jiangsu University,Zhenjiang 212013,Jjiangsu,China [2]Thayer School of Engineering,Dartmouth College,Hanover,New Hampshire 03755,USA [3]Thermal Science Research Center,Shandong Institute of Advanced Technology,Jinan 250103,Shandong,China [4]School of Materials Science and Engineering,The University of New South Wales,Sydney,NSw 2502,Australia [5]School of Chemistry and Pharmaceutical Sciences,Guangxi Normal University,Guilin 541004,Guangxi,China [6]School of Materials and New Energy,Ningxia University,Yinchuan 750021,Ningxia,China

出　　处：《Journal of Energy Chemistry》2025年第2期392-401,I0008,共11页能源化学(英文版)

基　　金：financially supported by the National Natural Science Foundation of China,China(52004103,51974137,52274229,22350410378 and 52304328);the China Postdoctoral Science Foundation,China(2020M671361 and 2023M733189);the Natural Science Foundation of Jiangsu Province,China(BK20220534);the Jiangsu Postdoctoral Science Foundation,China(2020Z090);the Senior Talents Fund of Jiangsu University,China(5501220014);the Key Research and Development Project of Ningxia Province,China(2024BEE02001);the Open Project of Key Laboratory of Advanced Battery Materials of Yunnan Province,China(KLABM-2024092403).

摘　　要：Single crystal Ni-rich cathode materials(SCNCM)are a good supplement in the market of nickel-based materials due to their safety and excellent electrochemical performance.However,the challenges of cation mixing,phase change during charge/discharge,and low thermal stability remain unresolved in single crystal particles.To address these issues,SCNCM are rationally modified by incorporating transition metal(TM)oxides,and the influence of metal ions with different valence states on the electrochemical properties of SCNCM is methodically explored through experimental results and theoretical calculations.Enhanced structural stability is demonstrated in SCNCM after the modifications,and the degree of improvement in the matrix materials varies depending on the valence state of doped TM ions.The highest structural stability is found in WO_(3)-modified SCNCM,due to the smaller effective ion radii,higher electro-negativity,stronger W-O bond,and efficient suppression of oxygen vacancy generation.As a result,WO_(3)-modified SCNCM have outstanding cycle performance,with a capacity retention rate of90.2%after 200 cycles.This study provides an insight into the design of advanced SCNCM with enhanced reversibility and cyclability.

关 键 词：Single crystal Ni-rich material Lithium-ion battery lon doping In-situ coating Strengthening mechanism analysis 

分 类 号：TB34[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]