电解质
钾
阴极
材料科学
阳极
金属
相间
乙醚
无机化学
硝酸钾
化学工程
电极
化学
有机化学
冶金
物理化学
工程类
生物
遗传学
作者
Huwei Wang,Jiahui Dong,Qing Guo,Wenxin Xu,Haodong Zhang,Kah Chun Lau,Yingjin Wei,Junyang Hu,Dengyun Zhai,Feiyu Kang
标识
DOI:10.1016/j.ensm.2021.08.013
摘要
Rechargeable potassium (K) metal batteries (PMBs) remain deeply challenged by the lack of suitable electrolytes that are stable against both highly reactive K anodes and 4 V-class cathodes. Despite their good reductive stability with K metal, classic potassium bis(fluorosulfonyl)amide (KFSI)-based ether electrolytes are typically used only in <4.0 V PMBs due to their limited oxidation stability. Herein, a potassium nitrate (KNO3)-containing ether electrolyte, at a moderate KFSI concentration (2.3 M) rather than a high concentration (normally, >3 M), is reported for the first time to be used in 4 V-class PMBs. A stable N/F-rich solid electrolyte interphase (SEI) is formed, enabling dense and uniform K deposition, especially under high current density. Remarkably, the PMBs with Prussian blue cathode exhibits an unprecedented cycle life (1000 cycles, 122 days). This work provides new perspectives of electrolyte design for 4 V-class PMBs.
科研通智能强力驱动
Strongly Powered by AbleSci AI