Thermochemical Cyclization Constructs Bridged Dual-Coating of Ni-Rich Layered Oxide Cathodes for High-Energy Li-Ion Batteries

Jing Wang, Qiang Yuan, Zhixin Ren, Chunhao Sun, Junfan Zhang, Ran Wang, Mengmeng Qian, Qi Shi, Ruiwen Shao, Daobin Mu, Yuefeng Su, Jing Xie*, Feng Wu, Guoqiang Tan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Enhancing microstructural and electrochemical stabilities of Ni-rich layered oxides is critical for improving the safety and cycle-life of high-energy Li-ion batteries. Here we propose a thermochemical cyclization strategy where heating polyacrylonitrile with LiNi0.8Co0.1Mn0.1O2can simultaneously construct a cyclized polyacrylonitrile outer layer and a rock-salt bridge-like inner layer, forming a compact dual-coating of LiNi0.8Co0.1Mn0.1O2. Systematic studies demonstrate that the mild cyclization reaction between polyacrylonitrile and LiNi0.8Co0.1Mn0.1O2induces a desirable "layered to rock-salt" structural transformation to create a nano-intermedium that acts as the bridge for binding cyclized polyacrylonitrile to layered LiNi0.8Co0.1Mn0.1O2. Because of the improvement of the structural and electrochemical stability and electrical properties, this cathode design remarkably enhances the cycling performance and rate capability of LiNi0.8Co0.1Mn0.1O2, showing a high reversible capacity of 183 mAh g-1and a high capacity retention of 83% after 300 cycles at 1 C rate. Notably, this facile and scalable surface engineering makes Ni-rich cathodes potentially viable for commercialization in high-energy Li-ion batteries.

Original languageEnglish
Pages (from-to)5221-5229
Number of pages9
JournalNano Letters
Volume22
Issue number13
DOIs
Publication statusPublished - 13 Jul 2022

Keywords

  • Dual-coating
  • Li-ion battery
  • Nickel-rich layered oxide
  • Polyacrylonitrile
  • Thermochemical cyclization

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