期刊
ELECTROCHIMICA ACTA
卷 212, 期 -, 页码 352-359出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.07.026
关键词
Layered nickel cobalt manganese oxide; Self-discharge; Suppression; Tris(trimethylsilyl)phosphate; Electrolyte additive
资金
- National Quality Inspection Administration Science and Technology planning project [2014QK040]
- jointp roject of National Natural Science Foundation of China
- Natural Science Foundation of Guangdong Province [U1401248]
- key project of Science and Technology in Guangdong Province [2013B090800013]
- Innovative Platform of Guangzhou Municipality [201509030005]
- Dongguan City Project for Cooperation among Industries, Universities and Institutes [2015509124103]
- scientific research project of Department of Education of Guangdong Province [2013CXZDA013]
Application of layered nickel cobalt manganese oxide as cathode under higher potential than conventional 4.2V yields a significant improvement in energy density of lithium ion battery. However, the cathode fully charged under high potential suffers serious self-discharge, in which the interaction between the cathode and electrolyte proceeds without potential limitation. In this work, we use tris (trimethylsilyl) phosphate (TMSP) as an electrolyte additive to solve this problem. A representative layered nickel cobalt manganese oxide, LiNi1/3Co1/3Mn1/3O2, is considered. The effect of TMSP on self-discharge behavior of LiNi1/3Co1/3Mn1/3O2 is evaluated by physical and electrochemical methods. It is found that the self-discharge of charged LiNi1/3Co1/3Mn1/3O2 can be suppressed significantly by using TMSP. TMSP is oxidized preferentially in comparison with the standard electrolyte during initial charging process forming a protective cathode interface film, which avoids the interaction between cathode and electrolyte at any potential and thus prevents electrolyte decomposition and protects LiNi1/3Co1/3Mn1/3O2 from structure destruction. (C) 2016 Elsevier Ltd. All rights reserved.
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