Bimetallic-based composites for potassium-ion storage: challenges and perspectives

Abstract

Potassium ion batteries (PIBs) are important for the development of energy storage systems as an effective complement to lithium ion batteries (LIBs) owing to the abundance of potassium resources in the earth's crust to meet the needs of large-scale energy storage systems. To this end, numerous studies have focused on anode materials, which can provide high capacity for PIBs. Bimetallic-based compounds (ABXs) achieve higher capacity and structural diversity due to their different chemical compositions and rich spatial structures. Moreover, the synergistic effect of the two metals makes the structure of ABXs more stable. Hence, ABXs are one of the most promising anode materials. This review focuses on performance optimization strategies (such as metal base selection, structural design, voltage regulation, and electrolyte optimization) and the electrochemical properties of ABXs. Finally, the current challenges and research prospectives of ABXs are presented. This review is expected to provide new perspectives and deeper insights into the study of ABXs as anode materials for PIBs and large-scale energy storage devices.