材料科学
电解质
电化学窗口
电化学
离子液体
储能
化学工程
锂(药物)
电极
离子电导率
有机化学
物理化学
工程类
内分泌学
物理
医学
催化作用
功率(物理)
化学
量子力学
作者
Zhicheng Wang,Haiyang Zhang,Jingjing Xu,Anran Pan,Fengrui Zhang,Lei Wang,Ran Han,Jianchen Hu,Meinan Liu,Xiaodong Wu
标识
DOI:10.1002/adfm.202112598
摘要
Abstract High‐voltage Li‐metal batteries (LMBs) are regarded as next‐generation high‐energy‐density storage devices to apply to extensive fields such as electric vehicles, space explorations, subsea operations, and grid‐scale storages. Unfortunately, their practical applications are restricted by some defects of commercial carbonate electrolytes including flammability, low oxidation stability, narrow temperature operation window, and Li dendrites growth. Herein, a novel ultralow‐concentration electrolyte (ULCE, 0.1 m ) is fabricated by dissolving lithium difluoro(oxalato)borate in N ‐methyl‐ N ‐methoxyethyl‐pyrrolidinium bis(trifluoromethylsulfonyl)imide ([MEMP][TFSI]) ionic liquid and 1,1,2,2‐tetrafluoroethyl‐2,2,3,3‐tetrafluoropropylether. This advanced ULCE exhibits impressive merits including low cost, non‐flammability, wide operation temperature (−100 to +70 °C), and high electrochemical window (5.75 V). Meanwhile, it helps to suppress Li dendrite growth due to the combined effect of the cation shielding by MEMP + cations and robust solid electrolyte interphase formed by the preferential decomposition of DFOB − and TFSI − anions. The LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622)/Li cell with ULCE shows outstanding performance under a high voltage of 4.5 V and a wide temperature range from −60 to 70 °C. This work provides a distinctive sight to design advanced electrolyte for lower cost, safe, and wide‐temperature high‐energy‐density LMBs.
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