材料科学
阴极
开裂
离子
锂(药物)
压力(语言学)
氧气
电子
复合材料
纳米技术
化学物理
化学工程
物理化学
量子力学
哲学
内分泌学
有机化学
化学
语言学
工程类
物理
医学
作者
Ze Ren,Cai Shen,Liang Meng,Jian Liu,Shengqi Zhang,Ying Gai,Liyuan Huai,Xiaosong Liu,Deyu Wang,Liu Hong
标识
DOI:10.1016/j.ensm.2020.02.028
摘要
The cyclic plummet caused by mechanical-damage-induced particle cracking is one of the key challenges to hinder the practical application of nickel-rich cathodes. Mechanical stress, roughly estimated by Δc resulted from variation of O-(Li)–O propelling forces, could be tuned up by partially deflecting oxygen charges. Herein, we propose a strategy to abate the mechanical stress of LiNi0.9Co0.08Mn0.02O2 via adjusting electrons’ distribution with appropriate cations substitution. Among the investigated species, Ti- and Al-modifications alleviate the change of lattice c by drawing the neighbor-oxygen charges to transition metal (TM) layers, and Zn-substitution aggrandizes Δc indicating that pushing effect plays the dominant role. Since it renders the largest reduction of lattice c variation, ~40% less in both regions, Ti-substituted sample retains 93.4% of the initial capacity after 200 cycles, even without particle cracking, although the other samples also deliver ~220 mAhg−1 under 0.1 C. Our approaches demonstrate the dependence of mechanical stress on electronic micro-structure, which is viable to develop long-life cathodes for power lithium ion batteries.
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