Review on Recent Advances of Cathode Materials for Potassium‐ion Batteries

Potassium‐ion batteries (PIBs) as a promising supplement to lithium‐ion batteries have drawn great attention attributing to the abundant potassium resources, the fast‐ionic conductivity of potassium ions in electrolyte, and the low standard redox potential of potassium. However, the development of PIBs is still in its infancy, which is largely restricted by the fact that the electrode materials, especially the cathode materials of PIBs, are far from satisfactory in practical applications regarding the capacity, voltage, and cycle life. Therefore, most of current research efforts have been devoted to exploring new and high‐performance electrode materials for achieving PIBs with high capacity and voltage as well as excellent cyclability. In this review, the recent advancements on cathode materials for PIBs are specially summarized. Besides, technological developments, scientific challenges, and future research opportunities of cathode materials for PIBs are also briefly outlooked. Recently, potassium‐ion batteries (PIBs) attract considerable attention due to their low cost, fast ion conductivity in electrolyte and high operating voltage. Cathode materials play a significant role in determining the overall electrochemical property of PIBs. This review provides recent advancements of cathode materials for PIBs. Furthermore, challenges and prospects of these cathode materials are also discussed.