High-capacity potassium-ion batteries using new rigid backbone quinone-based polymer electrode materials

We report the synthesis and electrochemical study of three quinone-based ladder-type redox-active polymers. These materials were applied as electrode materials in potassium half-cells and delivered high specific discharge capacities of up to 268 mAh g−1 at 0.66 A g−1. Using concentrated diglyme-based electrolyte formulation allowed us to suppress capacity fading and enable stable charge-discharge cycling of the batteries. The designed materials represent promising electrode materials for emerging scalable organic potassium-ion battery technology.