期刊
ENERGY STORAGE MATERIALS
卷 28, 期 -, 页码 1-9出版社
ELSEVIER
DOI: 10.1016/j.ensm.2020.02.028
关键词
Mechanical stress; Cyclic stability; Particle cracking; Ni-rich cathodes; Lithium ion batteries
资金
- National Key R&D Program of China [2018YFB0905400]
- National Natural Science Foundation of China [51572273,21805297]
- Ningbo Natural Science Foundation [2018A610085]
- Ningbo S&T Innovation 2025 Major Special Programme [2018B10061, 2018B10087]
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.c 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 Delta c indicating that pushing effect plays the dominant role. Since it renders the largest reduction of lattice c variation, similar to 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 similar to 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据