材料科学
阴极
尖晶石
溶解
电解质
表征(材料科学)
锰
锂(药物)
原位
电极
纳米技术
降级(电信)
曲面重建
过渡金属
化学工程
催化作用
曲面(拓扑)
计算机科学
冶金
物理化学
化学
几何学
数学
生物化学
电信
气象学
内分泌学
工程类
物理
医学
作者
Xiaoxia Gou,Zhenkun Hao,Zhimeng Hao,Gaojing Yang,Zhuo Yang,Xinyue Zhang,Zhenhua Yan,Qing Zhao,Jun Chen
标识
DOI:10.1002/adfm.202112088
摘要
Abstract Lithium‐rich manganese‐based layered oxides (LROs) are standing out as cathode materials of lithium‐ion batteries (LIBs) due to merits on both capacity (>250 mAh g −1 ) and operation voltage (≈3.6 V). However, the applications of LROs are plagued by almost inevitable degradation of structure, in which electrode surface bears the brunt as the primacy barrier for Li + transport. Plenty of surface modification strategies are proposed to stabilize the structure and in situ self‐reconstruction strategies with atomic level connection to bulk structures provide robust layers to prevent the degradation. Herein, a critical review focusing on in situ surface reconstruction of LROs is summarized. It is started from the overview of LROs and then the surface challenges including lattice oxygen release, phase transformation, transition metal ions dissolution, and interfacial side reactions are further discussed. In situ self‐reconstruction strategies are emphasized to alleviate the performance degradation of LROs, from creating oxygen vacancies to synthesizing layered‐spinel or layered‐rocksalt heterogeneous structures. Among these approaches, synthesis and characterization methods, formation mechanisms and roles to stabilize the structures are highlighted. Finally, the prospects from the aspects of precise/large scale preparations, interphase design between electrolytes and electrodes, and in‐operando characterization approaches for the commercialization of LROs are provided.
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