尖晶石
结构稳定性
阴极
电化学
材料科学
切断
电压
电极
高压
结构材料
纳米技术
分析化学(期刊)
复合材料
化学
冶金
物理化学
物理
结构工程
工程类
量子力学
色谱法
作者
Hyesu Lee,Eunmi Jo,Kyung Yoon Chung,Dongjin Byun,Seung Min Kim,Wonyoung Chang
标识
DOI:10.1002/anie.201910670
摘要
The structural stability of cathode materials during electrochemical reactions, in particular, under high-rate discharge, is pertinent to the design and development of new electrode materials. This study investigates the structural inhomogeneity that develops within a single LiNi0.835 Co0.15 Al0.015 O2 (NCA83) particle during a fast discharging process under different cutoff voltages. Some of the NCA83 particles discharged from a high cutoff voltage (4.8 V) developed surface areas in which the layered structure was recovered, although the interiors retained the degraded spinel structure. These micro- and nano-scale structural inversions from high cutoff voltage seem highly correlated with structural evolutions in the initial charged state, and may ultimately degrade the cycling stability. This study advances understanding of the structural inhomogeneity within primary particles during various electrochemical processes and may facilitate the development of new Ni-rich cathode materials.
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