Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6609622 | Electrochimica Acta | 2015 | 8 Pages |
Abstract
The cyclic stability of LiCoO2 as cathode of lithium ion battery under 4.5Â V is improved by using 4-(trifluoromethyl) benzonitrile (4-TB) as an electrolyte additive. In a standard (STD) electrolyte (1.0Â mol/L LiPF6 in EC/EMC/DMC, 1/1/1 by volume) containing 0.5Â wt.% 4-TB, LiCoO2 exhibits an improved cyclic stability when the end-off charge potential is increased to 4.5Â V. The characterizations, from XRD, ICP, SEM, FTIR, and XPS, demonstrate that a cathode electrolyte interphase (CEI) film is formed on LiCoO2 from 4-TB, which suppresses the successive decomposition of STD electrolyte and prevents LiCoO2 from crystal destruction. Theoretical calculations confirm that 4-TB is adsorbed and oxidized on LiCoO2 preferentially to the carbonates in electrolyte, forming the protective CEI film.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Xianshu Wang, Xiaolin Liao, Wenna Huang, Lidan Xing, Youhao Liao, Qiming Huang, Mengqing Xu, Weishan Li,