Phase Behavior during Electrochemical Cycling of Ni‐Rich Cathode Materials for Li‐Ion Batteries,Advanced Energy Materials

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Phase Behavior during Electrochemical Cycling of Ni‐Rich Cathode Materials for Li‐Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-12-21 , DOI: 10.1002/aenm.202003404
Chao Xu _{1,

2} , Philip J. Reeves _{1,

2} , Quentin Jacquet _{1,

2} , Clare P. Grey _{1,

2}

Affiliation

Although layered lithium nickel‐rich oxides have become the state‐of‐the‐art cathode materials for lithium‐ion batteries in electric vehicle (EV) applications, they can suffer from rapid performance failure—particularly when operated under conditions of stress (temperature, high voltage)‐the underlying mechanisms of which are not fully understood. This essay aims to connect electrochemical performance with changes in structure during cycling. First, structural properties of LiNiO₂ are compared to the substituted Ni‐rich compounds NMCs (LiNi_xMn_yCo₁₋_x₋_yO₂) and NCAs (LiNi_xCo_yAl₁₋_x₋_yO₂). Particular emphasis is placed on decoupling intrinsic behavior and extrinsic “two‐phase” reactions observed during initial cycles, as well as after extensive cycling for NMC and NCA cathodes. The need to revisit the various high‐voltage structural changes that occur in LiNiO₂ with modern characterization tools is highlighted to aid the understanding of the accelerated degradation for Ni‐rich cathodes at high voltages.

中文翻译：

锂离子电池富镍正极材料电化学循环过程中的相行为

尽管层状富含锂镍的氧化物已成为电动汽车（EV）应用中最先进的锂离子电池正极材料，但它们仍会遭受快速性能下降的困扰，尤其是在压力（温度，高电压）-其基本机理尚未完全了解。本文旨在将电化学性能与循环过程中结构的变化联系起来。首先，的LiNiO的结构性质₂进行比较，以取代的富Ni化合物的NMC（的LiNi _X锰_ý钴_1-_X_-_Ÿ Ò ₂）和种NCA（的LiNi _X钴_ý的Al _1-_X_-_y O₂）。特别强调的是在初始循环以及NMC和NCA阴极的大量循环后观察到的内在行为和外在“两相”反应的解耦。强调了需要使用现代表征工具来重新审视LiNiO₂中发生的各种高压结构变化，以帮助理解富镍阴极在高压下的加速降解。

更新日期：2021-02-18

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