电解质
X射线光电子能谱
材料科学
阳极
化学工程
石墨
电极
扫描电子显微镜
透射电子显微镜
介电谱
阴极
电化学
分析化学(期刊)
化学
纳米技术
复合材料
有机化学
工程类
物理化学
作者
Dongqing Liu,Kun Qian,Yan‐Bing He,Dan Luo,Hai Li,Mengyao Wu,Feiyu Kang,Baohua Li
标识
DOI:10.1016/j.electacta.2018.02.151
摘要
Three-electrode LiCoO2/graphite pouch cells have been used to investigate the film formation mechanism of Fluoroethylene carbonate (FEC) for high-voltage performance. It is found that the cells exhibit improved cycling performance in 5% FEC containing electrolyte in the voltage range of 3.0–4.4 V. In situ electrochemical impedance spectroscopy (EIS) results reveal that the gradual film formation process in FEC electrolyte is not a negative lithium consumption process, different from that of the base electrolyte. The characterizations from scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) demonstrate that FEC facilitates the formation of stable solid electrolyte interfaces (SEI) simultaneously on anode and cathode of the LiCoO2/graphite pouch cells with different decomposition mechanisms, which can effectively protect electrodes and prevent electrolyte decomposition on both electrodes.
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