Coal-based carbon anodes for high-performance potassium-ion batteries

Potassium-ion batteries (PIBs) are considered as a viable alternative to lithium-ion batteries in large scale stationary energy storage. However, the low cost, high rate and long life anode still remains great challenge for the commercialization of PIBs. Herein, high performance carbon anodes for PIBs have been successfully prepared from low-cost and abundant coal through ball-milling, acid washing, oxidation and carbonization. We discover that...