Self-healing ability of Prussian blue analogs for aqueous potassium-ion batteries

The slow reaction kinetics,combined with the relatively large radius of K-ion,makes it challenging to develop acceptable electrode materials for reversible insertion/deinsertion of potassium ions,thus reducing the cycle stability and reversible capacity of aqueous potassium-ion batteries(PIBs)[1].Given this,there is still a long way to go in developing high-performance electrode materials for PIBs with a stable cycle life and high energy density.According to a literature study on PIB electrode materials,the electrochemical performance of cathode materials can be easily achieved through various structural modifications[2–4].Nevertheless,the study of cathode material optimization and operating mechanisms is insufficient,hindering the energy density of PIBs from reaching a satisfactory level.In this context,the performance of cathode material becomes the decisive factor for the performance of PIBs.