Mengqing Xu, Yanlin Liu, Bin Li
2012
Citations
1
Influential Citations
108
Citations
Quality indicators
Journal
Electrochemistry Communications
Abstract
Abstract Tris (pentafluorophenyl) phosphine (TPFPP) is used as an electrolyte additive to improve the cycling performance of high voltage (~ 5 V) lithium-ion battery. The electrochemical behaviors and surface chemistry of LiNi 0.5 Mn 1.5 O 4 are investigated via cyclic voltammetry, chronoamperometry, charge–discharge test, X-ray photoelectron spectroscopy, and theoretical computations. It is found that the cycling performance of the cell Li/LiNi 0.5 Mn 1.5 O 4 , using an electrolyte of 1.0 M LiPF 6 in ethylene carbonate/dimethyl carbonate/diethyl carbonate (1/1/1, in volume), can be improved by adding TPFPP into the electrolyte. The theoretical calculations predict that TPFPP is preferably oxidized compared to the solvents. Electrochemical measurements and XPS analyses show that a protective film is formed on LiNi 0.5 Mn 1.5 O 4 when TPFPP is used, which contributes to the cycling performance improvement of the cell.