Improved electrochemical performances of high voltage LiCoO2 with tungsten doping

doi:10.1088/1674-1056/27/8/088202

Abstract

The effects of tungsten W doping and coating on the electrochemical performance of LiCoO₂ cathode are comparatively studied in this work. The amount of modification component is as low as 0.1 wt% and 0.3 wt% respectively. After 100 cycles between 3.0 V-4.6 V, 0.1 wt% W doping provides an optimized capacity retention of 72.3%. However, W coating deteriorates battery performance with capacity retention of 47.8%, even lower than bare LiCoO₂ of 55.7%. These different electrochemical performances can be attributed to the surface aggregation of W between doping and coating methods. W substitution is proved to be a promising method to develop high voltage cathodes. Practical performance relies on detailed synthesis method.

Keywords: cathode lithium-ion batteries lithium cobalt oxide doping coating

Received: 08 April 2018
Revised: 23 May 2018
Accepted manuscript online:

PACS:	82.47.Aa	(Lithium-ion batteries)
	82.45.Fk	(Electrodes)

Corresponding Authors: Xi-Qian Yu, Hong Li
E-mail: xyu@iphy.ac.cn;hli@iphy.ac.cn

Cite this article:

Jie-Nan Zhang(张杰男), Qing-Hao Li(李庆浩), Quan Li(李泉), Xi-Qian Yu(禹习谦), Hong Li(李泓) Improved electrochemical performances of high voltage LiCoO₂ with tungsten doping 2018 Chin. Phys. B 27 088202

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Improved electrochemical performances of high voltage LiCoO2 with tungsten doping

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Improved electrochemical performances of high voltage LiCoO₂ with tungsten doping