Research progress of electrolytes for aluminum ion batteries

Due to the rapid development of society, demands for secondary ion batteries are gradually increasing. Aluminum-ion battery has a lot of advantages, such as low cost, high safety and good cycle performance. Thus, it is an ideal energy storage system to replace lithium-ion battery in the future. As an important component of battery system, electrolyte plays a key role in transferring ions and connecting circuits, and has a direct impact on battery performance. Therefore, designing and preparing of electrolytes with good overall performance has become a research hotspot in aluminum-ion batteries. This article summarizes the current research status of liquid electrolytes, inorganic solid electrolytes and polymer electrolytes for aluminum-ion batteries, analyzes their performance in terms of cost, electrochemical window, chemical stability and ionic conductivity. The future development direction of aluminum-ion battery electrolytes is prospected.