This review mainly focuses on the recent progress of various liquid organic and solid-state K+ electrolytes for potassium-based batteries. First, the key design principles and applications of organic liquid electrolyte in various battery systems are discussed. Then the research status of ionic liquid, gel/polymer, and solid electrolyte are summarized and evaluated. Finally, this review discusses the challenge of various electrolyte/electrode interfaces and puts forward promising research direction and opportunities in the future.
Potassium (K)-based batteries are viewed as the most promising alternatives to lithium-based batteries, owing to their abundant potassium resource, lower redox potentials (−2.97 V vs. SHE), and low cost. Recently, significant achievements on electrode materials have boosted the development of potassium-based batteries. However, the poor interfacial compatibility between electrode and electrolyte hinders their practical. Hence, rational design of electrolyte/electrode interface by electrolytes is the key to develop K-based batteries. In this review, the principles for formulating organic electrolytes are comprehensively summarized. Then, recent progress of various liquid organic and solid-state K+ electrolytes for potassium-ion batteries and beyond are discussed. Finally, we offer the current challenges that need to be addressed for advanced K-based batteries.
Ling Ni, Gaojie Xu, Chuanchuan Li, Guanglei Cui*
How to cite:
L. Ni, G. Xu, C. Li, G. Cui, Exploration 2022, 2, 20210239.