Emerging High‐Entropy Electrolytes for High‐Performance Alkali Metal Batteries: Mechanism, Progress, and Prospects

ABSTRACT Alkali metal (Li, Na, and K) batteries (AMBs) have attracted widespread attention in recent years because of their high theoretical specific capacity and attractive energy density. However, they still suffer from uncontrollable dendrite growth and sluggish conductivity during cycling, which lead to security issues and inferior cycling performance. Fortunately, the introduction of high‐entropy electrolytes (HEEs) in AMBs can effectively inhibit dendrites' growth and accelerate the ion diffusion kinetics, resulting in improved electrochemical performance. Considering the rapidly growing research enthusiasm for this topic over the past few years, we have comprehensively and systematically summarized the recent advances in HEEs (including liquid electrolyte, gel polymer electrolytes, and solid‐state electrolytes) and their corresponding mechanisms in AMBs, particularly focusing on their enhancement of ionic conductivity and cycling performance. Finally, rational suggestions and prospects for the future development of HEEs are also proposed.