A high-performance potassium metal battery using safe ionic liquid electrolyte

• DOI: 10.1073/pnas.2012716117
• Publication Date: 2020-10-27T00:41:44Z
• Authors: Hao Sun; Peng Liang; Guanzhou Zhu; Wei Hsuan Hung; Yuan-Yao Li; Hung-Chun Tai; Cheng-Liang Huang; Jiachen Li; Yongtao Meng; Michael Angell; Chang-An Wang; Hongjie Dai
• Keywords: Flammable liquid; Potassium-ion battery

Significance Rechargeable potassium batteries are promising alternatives of Li owing to the earth abundance and low cost potassium. The safety K metal battery involving highly reactive flammable organic electrolyte remains poor, risking fire hazards during use. This work presents development an ionic liquid that allows safe high-performance batteries. An impressive capacity retention 89% after 820 cycles is achieved with a high average Coulombic efficiency 99.9%. Moreover, can safely stably at 60 °C. provides insights future design innovation other toward long-life energy storage.