Graphene Encircled KFeSO4F Cathode Composite for High Energy Density Potassium-Ion Batteries

Herein, we report on a facile and novel synthesis and multifarious characterizations of the graphene wrapped KFeSO4F (KFSF@G) for the first time. The KFSF@G electrode exhibits admirable electrochemical performance with a high average operating potential of 3.55 V, high reversible discharge capacity of 111.51 mAh g-1.