Carbon-supported single-atom metal materials for robust Li/Na/K batteries: A mini review

Alkali ion batteries have attracted broad attention because of their high power and energy density. However, there is an urgency to explore novel electrode materials with higher capacity and longer cycle life to meet the ever-increasing requirements. Due to their unique electronic structure and coordination environment, carbon-supported single-atom metal (CSAM) materials are promising to enhance the anode capacity and prolong its lifespan, but the development is still in its infancy stage. In this mini-review, we first summarize the application of CSAM materials in alkali ion batteries from theoretical predictions to experimental investigations. Then the work mechanisms of CSAM materials in alkali ion batteries are discussed, and their disadvantages, such as low mass loading, low activity and metal atom migration, are reviewed. Finally, we discuss the solution strategies to address these issues. This mini-review will guide the structural design of CSAM materials and accelerate the future application in alkali ion batteries.