电解质
锂(药物)
阳极
电化学
石墨
电导率
化学
离子
溶剂
化学工程
材料科学
电极
物理化学
有机化学
心理学
工程类
精神科
作者
Fuyou Xiang,Pipi Wang,Hao Cheng
标识
DOI:10.1002/ente.201901277
摘要
Herein, a novel sulfone‐based compound, methyl 2,2‐difluoro‐2‐(fluorosulfonyl) acetate (MDFA) is studied for its effects in improving LiCoO 2 /graphite pouch Li‐ion cell performance at high working voltage (4.45 V). Calculations based on density functional theory (DFT) and electrochemical tests reveal that MDFA can be reduced preferentially compared with the electrolyte solvent. It helps form a robust interface film with high lithium‐ion conductivity, which will greatly reduce the interfacial impedance of cells. The pouch cells containing 1 wt% MDFA show excellent discharge performance at low temperature (−10 °C) and such concentration of MDFA can also inhibit the deposition of lithium on the anode. Moreover, this additive can promote stability of cell cycling at high voltage. The overall results indicate that the MDFA is a low‐impedance additive that can be well applied to improve the property of high‐voltage lithium‐ion batteries.
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