Improving LiNi0.9Co0.08Mn0.02O2’s cyclic stability via abating mechanical damages

Zhongmin Ren, Cai Shen, Meng Liu, Jian Liu, Shengqi Zhang, Gai Yang, Liyuan Huai, Xiaosong Liu, Deyu Wang, Hong Li

Research output: Journal PublicationArticlepeer-review

23 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalEnergy Storage Materials
Volume28
DOIs
Publication statusPublished - Jun 2020
Externally publishedYes

Keywords

  • Cyclic stability
  • Lithium ion batteries
  • Mechanical stress
  • Ni-rich cathodes
  • Particle cracking

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (all)
  • Energy Engineering and Power Technology

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