电解质
稀释剂
锂(药物)
离子
材料科学
高压
电压
锂离子电池
电极
电池(电)
化学工程
阴极
化学
电气工程
热力学
核化学
有机化学
物理化学
物理
工程类
内分泌学
功率(物理)
医学
作者
Tingting Feng,Guozhu Yang,Shu Zhang,Ziqiang Xu,Haiping Zhou,Mengqiang Wu
标识
DOI:10.1016/j.cej.2021.134138
摘要
Using localized high-concentration electrolytes (LHCEs), which have high oxidation resistance and low viscosity, in high-voltage lithium-ion batteries can facilitate the low-temperature operation of the batteries. In this study, a new short-chain fluorinated diluent 1,1,2,2-tetrafluoroethyl methyl ether is used to prepare a methyl acetate-based LHCE that shows good stability against a LiNi0.5Mn1.5O4 (LNMO) cathode. Furthermore, an LNMO||Li battery (3–4.9 V vs. Li/Li+) with the LHCE shows good cycling stability at room temperature at 1C. Owing to the excellent low-temperature performance of the LHCE, the battery can discharge 80.85% of its room temperature capacity at 0.2C at the temperature of −50 °C and show reversible charge/discharge behavior at 0.1C at the temperature of −40 °C. In this study, LHCEs are successfully used to realize a high-voltage battery that could operate with a relatively high current density (≥0.1C) at a low temperature (-50 °C).
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