Inhibiting Voltage Decay in Li-Rich Layered Oxide Cathode:From O3-Type to O2-Type Structural Design  

作　　者：Guohua Zhang Xiaohui Wen Yuheng Gao Renyuan Zhang Yunhui Huang 

机构地区：[1]Institute of New Energy for Vehicles,Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials,School of Materials Science and Engineering,Tongji University,Shanghai 201804,People’s Republic of China [2]Contemporary Amperex Technology Co.,Ltd,Ningde 352100,People’s Republic of China [3]State Key Laboratory of Material Processing and Die and Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第12期81-102,共22页纳微快报（英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant Nos.22279092 and 5202780089).

摘　　要：Li-rich layered oxide(LRLO)cathodes have been regarded as promising candidates for next-generation Li-ion batteries due to their exceptionally high energy density,which combines cationic and anionic redox activities.However,continuous voltage decay during cycling remains the primary obstacle for practical applications,which has yet to be fundamentally addressed.It is widely acknowledged that voltage decay originates from the irreversible migration of transition metal ions,which usually further exacerbates structural evolution and aggravates the irreversible oxygen redox reactions.Recently,constructing O2-type structure has been considered one of the most promising approaches for inhibiting voltage decay.In this review,the relationship between voltage decay and structural evolution is systematically elucidated.Strategies to suppress voltage decay are systematically summarized.Additionally,the design of O2-type structure and the corresponding mechanism of suppressing voltage decay are comprehensively discussed.Unfortunately,the reported O2-type LRLO cathodes still exhibit partially disordered structure with extended cycles.Herein,the factors that may cause the irreversible transition metal migrations in O2-type LRLO materials are also explored,while the perspectives and challenges for designing high-performance O2-type LRLO cathodes without voltage decay are proposed.

关 键 词：Lithium-ion batteries Li-rich layered oxide Voltage decay Migration of transition metal ions O2-type structural design 

分 类 号：TM912[电气工程—电力电子与电力传动]