Gradient Concentration Refilling of N Stabilizes Oxygen Vacancies for Enhanced Zn2+ Storage

Author:

Wang Ming1,Zhao Guangyu1,Bai Xiaoming1,Yu Weijian1,Zhao Chenghao1,Gao Zhenren2,Lyu Pengbo2,Chen Zhaoyu3,Zhang Naiqing1ORCID

Affiliation:

1. State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China

2. Hunan Provincial Key Laboratory of Thin Film Materials and Devices School of Materials Science and Engineering Tiangtan University Xiangtan 411105 China

3. Environment Simulation Research Infrastructure Harbin Institute of Technology Harbin 150001 China

Abstract

AbstractThe introduction of oxygen vacancies into aqueous zinc ion battery (ZIB) cathodes can significantly improve the diffusion kinetics of Zn2+, endowing enhanced electrochemical performance. However, the stability of oxygen vacancies in batteries during aqueous electrolyte cycling has been overlooked. Here, the oxygen vacancy is stabilized by the refilling of different impurity atoms, and gradient concentration refilling of N achieves the most stable state of the oxygen vacancy with minimum formation energy (4.77 eV). The obtained Zn3V2O7(OH)2·2H2O with gradient N refilling of partial oxygen vacancies (N‐VO‐ZVO) achieves more stable oxygen vacancies and a low Zn2+ diffusion energy barrier (0.19 eV) with an ultra‐high rate performance of 186 mAh g−1 at 100 A g−1 and capacity retention rate of 84.9% after 10 000 cycles.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Materials Science,Renewable Energy, Sustainability and the Environment

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