电解质
溶剂化
钾
化学
乙醚
金属
无机化学
离子
化学工程
有机化学
物理化学
电极
工程类
作者
Mei Lin Gu,Xunzhu Zhou,Qiusheng Yang,Shenxu Chu,Lin Liu,Jiaxin Li,Yang Zhao,Xing Hu,Shuo Shi,Zhuo Chen,Jintao Zhang,Shulei Chou,Kaixiang Lei
标识
DOI:10.1002/anie.202402946
摘要
Electrolytes with anion-dominated solvation are promising candidates to achieve dendrite-free and high-voltage potassium metal batteries. However, it's challenging to form anion-reinforced solvates at low salt concentrations. Herein, we construct an anion-reinforced solvation structure at a moderate concentration of 1.5 M with weakly coordinated cosolvent ethylene glycol dibutyl ether. The unique solvation structure accelerates the desolvation of K+, strengthens the oxidative stability to 4.94 V and facilitates the formation of inorganic-rich and stable electrode-electrolyte interface. These enable stable plating/stripping of K metal anode over 2200 h, high capacity retention of 83.0% after 150 cycles with a high cut-off voltage of 4.5 V in K0.67MnO2//K cells, and even 91.5% after 30 cycles under 4.7 V. This work provides insight into weakly coordinated cosolvent and opens new avenues for designing ether-based high-voltage electrolytes.
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