Improvement of long-term cycling performance of high-nickel cathode materials by ZnO coating

Nanotechnology Reviews

article

Fangfang Wang¹  Ruoyu Hong¹  Xuesong Lu²  Huiyong Liu¹  Yuan Zhu³  Ying Zheng⁴  David Hui⁵ 

[1] College of Chemical Engineering, Fuzhou University;School of Engineering and Physical Sciences, Heriot-Watt University, United Kingdom;Ltd.;Department of Chemical and Biochemical Engineering, Western University;Department of Mechanical Engineering, University of New Orleans, United States of America

关键词: LiNi0.8Co0.15Al0.05O2;    cathode material;    ZnO coating;    lithium-ion battery;   

DOI  :  10.1515/ntrev-2021-0020

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

The high-nickel cathode material of LiNi 0.8 Co 0.15 Al 0.05 O 2 (LNCA) has a prospective application for lithium-ion batteries due to the high capacity and low cost. However, the side reaction between the electrolyte and the electrode seriously affects the cycling stability of lithium-ion batteries. In this work, Ni 2+ preoxidation and the optimization of calcination temperature were carried out to reduce the cation mixing of LNCA, and solid-phase Al-doping improved the uniformity of element distribution and the orderliness of the layered structure. In addition, the surface of LNCA was homogeneously modified with ZnO coating by a facile wet-chemical route. Compared to the pristine LNCA, the optimized ZnO-coated LNCA showed excellent electrochemical performance with the first discharge-specific capacity of 187.5 mA h g −1 , and the capacity retention of 91.3% at 0.2C after 100 cycles. The experiment demonstrated that the improved electrochemical performance of ZnO-coated LNCA is assigned to the surface coating of ZnO which protects LNCA from being corroded by the electrolyte during cycling.

【 授权许可】

CC BY