电解质
溶剂化
易燃液体
磷酸三甲酯
化学
可燃性
电导率
无机化学
离子电导率
溶剂
金属
化学工程
材料科学
有机化学
磷酸盐
电极
物理化学
工程类
作者
Zhijie Wang,Yanyan Wang,Baohua Li,James C. Bouwer,Kenneth Davey,Jun Lü,Zaiping Guo
标识
DOI:10.1002/anie.202206682
摘要
In traditional non-flammable electrolytes a trade-off always exists between non-flammability and battery performance. Previous research focused on reducing free solvents and forming anion-derived solid-electrolyte interphase. However, the contribution of solvated anions in boosting the stability of electrolyte has been overlooked. Here, we resolve this via introducing anions into Li+ solvation sheaths using anions with similar Gutmann donor number (DN) to that of solvents. Taking trimethyl phosphate fire-retardant (DN=23.0 kcal mol-1 ) and NO3- (DN=22.2 kcal mol-1 ) as an example, NO3- is readily involved in the Li+ solvation sheath and reduces the polarity of solvent. This results in boosted stability of electrolyte against Li. The developed non-flammable electrolyte has low viscosity, high ionic conductivity and is low cost. The reversibility of Li-Cu cell was improved to 99.49 % and the lifespan of practical LMBs was extended by >100 %.
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