Potassium perylene-tetracarboxylate with two-electron redox behaviors as a highly stable organic anode for K-ion batteries

Potassium perylene-3,4,9,10-tetracarboxylate was exploited as a new organic anode for potassium-ion batteries, exhibiting two-electron redox behavior and a theoretical capacity of 93 mA h g(-1). After optimization, the K4PTC electrode showed an average of 50 mA h g(-1) over 2500 cycles at a current density of 0.5 A g(-1).