Enhanced electrochemical performance of cobalt oxide layers coated LiNi0.8Co0.1Mn0.1O2 by polyvinylpyrrolidone-assisted method cathode for Li-ion batteries

Jian Wei; Di Liang; Yuxuan Ji; Bing Chen; Chao Jiang; Xueting Li

doi:10.1016/j.jcis.2022.02.095

Enhanced electrochemical performance of cobalt oxide layers coated LiNi_0.8Co_0.1Mn_0.1O₂ by polyvinylpyrrolidone-assisted method cathode for Li-ion batteries

J Colloid Interface Sci. 2022 Jun 15:616:520-531. doi: 10.1016/j.jcis.2022.02.095. Epub 2022 Feb 22.

Authors

Jian Wei¹, Di Liang², Yuxuan Ji², Bing Chen², Chao Jiang², Xueting Li³

Affiliations

¹ College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China. Electronic address: weijian@xauat.edu.cn.
² College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China.
³ College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China. Electronic address: xuetingli@xauat.edu.cn.

PMID: 35228048
DOI: 10.1016/j.jcis.2022.02.095

Abstract

LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) stands out among many cathode materials for lithium-ion batteries due to its high energy density. However, the Li-Ni mixing phenomenon and the side reactions between the active cathode material and the electrolyte during the charging and discharging process have hindered its commercial application. Co₃O₄ is a transition metal oxide with a spinel structure that can provide Li⁺ embedding sites for NCM811 and is considered a competitive coating material. Here, we use polyvinylpyrrolidone (PVP) as the assisting material and Co(NO₃)₂·6H₂O as the cobalt source to form a uniform and continuous Co₃O₄ coating on the surface the of NCM811 by a simple wet chemical method. The formed coating can avoid direct contact between NCM811 and the electrolyte, enhance the structural stability of the material surface, and reduce the polarization of the electrode during cycling. The experimental results demonstrate that the performance of the modified cathode materials is higher than that of NCM811, with a higher initial specific capacity (183.59 mAh·g^-1 at 0.1C), specific capacity (151.10 mAh·g^-1 at 2C) and cycle performance. The performances are better than those of many oxide coating materials at this research stage and provide a potential solution for the practical application of NCM811 lithium-ion batteries that provide high energy.

Keywords: Co(3)O(4); Electrochemical performance; Lithium-ion battery; Ni-rich cathode material.