电解质
材料科学
锂(药物)
金属锂
溶剂
阳极
离子液体
化学工程
碳酸乙烯酯
盐(化学)
可燃性
无机化学
有机化学
电极
化学
复合材料
催化作用
物理化学
内分泌学
工程类
医学
作者
Yuan Yang,Yini Wang,Zeyu Hui,Boyu Qie,Aijun Li,Daniel W. Paley,Bingqing Xu,Xue Z. Wang,A. M. Chitu,Haowei Zhai,Tiaoyao Gong,Yuan Yang
标识
DOI:10.1021/acsami.8b22156
摘要
Rechargeable metallic lithium batteries are considered as promising candidates for next-generation energy storage due to their high energy densities. However, safety concerns associated with electrolyte flammability and dendrite growth hinder their practical applications. Nonflammable liquid electrolytes have attracted significant attention recently, but they are mainly based on expensive ionic liquids, fluorinated solvents, or with highly concentrated salt. Here we design a novel trisalt electrolyte composed of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)-lithium bis(oxalato)borate (LiBOB)-LiPF6 in EC/PC solvent, which is not flammable even in contact with fire. Moreover, it creates unique protection of solid electrolyte interphase (SEI) film on lithium metal anode that allows 400 cycles of Li/Li(NiMnCo)1/3O2 cells with a capacity retention of 97.0% at 0.83 mA cm-2. This work illustrates that low-cost fluorine-free carbonate solvents can also realize nonflammable electrolyte with high performance, which opens new opportunities to promote safety and energy density of rechargeable lithium batteries simultaneously.
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