电解质
化学
X射线光电子能谱
介电谱
电化学
锂(药物)
离子电导率
化学工程
扫描电子显微镜
电导率
分析化学(期刊)
电极
极化(电化学)
材料科学
复合材料
物理化学
色谱法
医学
工程类
内分泌学
作者
Han He,Yue Wang,Meng Li,Jingyi Qiu,Yuehua Wen,Junhong Chen
标识
DOI:10.1016/j.jelechem.2022.116870
摘要
The operation of lithium–ion batteries (LIBs) at low temperature is hampered by decreased electrical conductivity and delayed electrode reaction kinetics. Due to its positive solid electrolyte interphase (SEI) formation properties, fluoroethylene carbonate (FEC) is one of the most widely researched additives for LIBs. Herein, charge–discharge tests, electrochemical impedance spectroscopy scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X–ray photoelectron spectroscopy (XPS) were used to investigate the effect of FEC on LCO/Li cells. According to SEM, TEM and XPS results, the addition of FEC results in the formation of a thin and stable cathode–electrolyte interface (CEI) film on the surface of the LCO electrode. Charge–discharge curves show that adding FEC to the electrolyte reduces polarization while increasing the discharge capacity. At −40 °C, the discharge capacity in electrolyte with 10 wt% FEC is 75.3 % that at room temperature and only 46.8 % without FEC at 1C. LiF is the main component of the FEC electrochemistry that forms a CEI, which has a low interfacial resistance and improves the ionic conductivity of the electrolyte, thus facilitating the performance of the battery at low temperature.
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