Affiliation:
1. Key Laboratory of Advanced Batteries Materials for Electric Vehicles of China Petroleum and Chemical Industry Federation Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering Xi'an University of Technology Xi'an Shaanxi 710048 P. R. China
2. Department of Physics City University of Hong Kong Hong Kong 999077 P. R. China
3. Qinghai Provincial Key Laboratory of Nanomaterials and Nanotechnology Qinghai Minzu (Nationalities) University Xining 810007 P. R. China
Abstract
AbstractThe as‐reported doping entropy engineering of electrode materials that are usually realized by the sharing of multiple metal elements with the metal element from the lattice body, potentially has three shortages of stringent synthesis conditions, large active element loss, and serious lattice distortion. Herein, an interlayer entropy engineering of layered oxide cathodes is proposed, where the multiple metal ions are simultaneously intercalated into the same interlayer sites, thus avoiding the three shortages. Concretely, a novel interlayer medium‐entropy V2O5 ((MnCoNiMgZn)0.26V2O5∙0.84H2O) is successfully constructed by a one‐step hydrothermal method. The interlayer medium‐entropy effect is revealed to be that five metal ions pre‐intercalation induces the local symmetry‐broken [VO6] octahedra in bilayer V2O5, thus activating the reversible high‐voltage redox reaction, inhibiting the layer slip and following phase transformation by its pinning effect, and enhancing the charge transfer kinetics. As a result, the medium‐entropy cathode realizes the trade‐off between specific capacity and structural stability with a discharge capacity of 152 mAh g−1 at 0.1 A g−1 after 100 cycles, and a capacity retention rate of 98.7% at 0.5 A g−1 after 150 cycles for Li+ storage. This engineering provides a new guideline for the rational design of high‐performance layered oxide cathodes.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Education Department of Shaanxi Province
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献