电解质
阳极
钾
金属
无机化学
盐(化学)
电极
溶剂
材料科学
化学工程
化学
冶金
有机化学
物理化学
工程类
作者
Hua Wang,Dandan Yu,Xiao Wang,Zhiqiang Niu,Mengxue Chen,Liwei Cheng,Wei Zhou,Lin Guo
标识
DOI:10.1002/anie.201908607
摘要
Alloying anodes are promising high-capacity electrode materials for K-ion batteries (KIBs). However, KIBs based on alloying anodes suffer from rapid capacity decay due to the instability of K metal and large volume expansion of alloying anodes. Herein, the effects of salts and solvents on the cycling stability of KIBs based on a typical alloying anode such as amorphous red phosphorus (RP) are investigated, and the potassium bis(fluorosulfonyl)imide (KFSI) salt-based carbonate electrolyte is versatile to achieve simultaneous stabilization of K metal and RP electrodes for highly stable KIBs. This salt-solvent complex with a moderate solvation energy can alleviate side reactions between K metal and the electrolyte and facilitate K+ ion diffusion/desolvation. Moreover, robust SEI layers that form on K metal and RP electrodes can suppress K dendrite growth and resist RP volume change. This strategy of electrolyte regulation can be applicable to other alloying anodes for high-performance KIBs.
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