电解质
介电谱
X射线光电子能谱
锂(药物)
溶剂
电化学
化学
离子液体
电池(电)
石墨
电导率
锂离子电池
离子电导率
无机化学
分析化学(期刊)
材料科学
化学工程
有机化学
电极
物理化学
功率(物理)
催化作用
内分泌学
工程类
物理
医学
量子力学
作者
Weidong Lu,Kai Xie,Zhongxue Chen,Shizhao Xiong,Yi Pan,Chunman Zheng
标识
DOI:10.1016/j.jpowsour.2014.10.112
摘要
We develop a new co-solvent for wide temperature lithium ion battery electrolytes: 2,2,2-Trifluoroethyl N-caproate (TFENH) in this work and particularly investigate the effect of TFENH content on the electrochemical properties of the mixed electrolytes. The results show that the improved low and high temperature performances of LiCoO2/graphite can be achieved if the volume ratio of TFENH co-solvent is kept between 17 and 25 Vol%. Carbon nuclear magnetic resonance spectroscopy (13C NMR) indicate that TFENH co-solvent is prior to distribute in the bulk of electrolyte, which help to reduce the viscosity and enhance the ionic conductivity of the electrolyte at low temperature. Electrochemical impedance spectroscopy (EIS) show that few TFENH co-solvent incorporation is beneficial to decrease the resistance of SEI film. X-ray photoelectron spectroscopy (XPS) demonstrate that a thin and stable CH3(CH2)4COOLi film decomposed by TFENH is formed on the surface of graphite, which plays an crucial role in improving low temperature performance and cycling stability of lithium-ion batteries.
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