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- Title
Promoting Surface Electric Conductivity for High‐Rate LiCoO<sub>2</sub>.
- Authors
Xu, Shenyang; Tan, Xinghua; Ding, Wangyang; Ren, Wenju; Zhao, Qi; Huang, Weiyuan; Liu, Jiajie; Qi, Rui; Zhang, Yongxin; Yang, Jiachao; Zuo, Changjian; Ji, Haocheng; Ren, Hengyu; Cao, Bo; Xue, Haoyu; Gao, Zhihai; Yi, Haocong; Zhao, Wenguang; Xiao, Yinguo; Zhao, Qinghe
- Abstract
The cathode materials work as the host framework for both Li+ diffusion and electron transport in Li‐ion batteries. The Li+ diffusion property is always the research focus, while the electron transport property is less studied. Herein, we propose a unique strategy to elevate the rate performance through promoting the surface electric conductivity. Specifically, a disordered rock‐salt phase was coherently constructed at the surface of LiCoO2, promoting the surface electric conductivity by over one magnitude. It increased the effective voltage (Veff) imposed in the bulk, thus driving more Li+ extraction/insertion and making LiCoO2 exhibit superior rate capability (154 mAh g−1 at 10 C), and excellent cycling performance (93 % after 1000 cycles at 10 C). The universality of this strategy was confirmed by another surface design and a simulation. Our findings provide a new angle for developing high‐rate cathode materials by tuning the surface electron transport property.
- Subjects
ELECTRIC conductivity; SURFACE conductivity; ELECTRON transport; ELECTRON diffusion; METAL oxide semiconductor capacitors; SURFACES (Technology); ELECTROCHEMICAL electrodes
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 10, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202218595