writer：Chao Chen, et al.
keywords：ether-based electrolytes, multidentate solvents, solvation structures, potassium metal anode, dendrite-free metal anode
source：期刊
specific source：ACS Appl. Energy Mater.
Issue time：2022年
Potassium (K) is regarded as an alternative to lithium (Li) for use in contemporary energy storage devices owing to its high abundance and low electrochemical potential. However, because K ions are larger than Li ions, they exhibit different solvation properties that can ultimately affect device performance. Herein, a multidentate ether-based electrolyte is demonstrated to effectively solvate K ions and the solvation structures can be further modulated with cosolvents. The use of the multidentate ether-based electrolyte also suppresses the formation of K dendrites and significantly enhances the cycling stability of K//K symmetric cells (e.g., over 2000 h at 0.25 mA cm^-2).