钾
阳极
电解质
化学
无机化学
金属
钾离子电池
离子
电极
有机化学
物理化学
磷酸钒锂电池
作者
Hua Wang,Dandan Yu,Xiao Wang,Zhiqiang Niu,Mengxue Chen,Liwei Cheng,Wei Zhou,Lin Guo
标识
DOI:10.1002/ange.201908607
摘要
Abstract 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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