Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6606015 | Electrochimica Acta | 2016 | 8 Pages |
Abstract
Application of layered nickel cobalt manganese oxide as cathode under higher potential than conventional 4.2Â V 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.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Xiaolin Liao, Xiongwen Zheng, Jiawei Chen, Ziyu Huang, Mengqing Xu, Lidan Xing, Youhao Liao, Qilun Lu, Xiangfeng Li, Weishan Li,