Potassium vanadate K2V3O8 as a superior anode material for potassium-ion batteries

Layered K2V3O8 (KVO) is successfully fabricated via simple hydrothermal reaction and employed as novel anode materials in potassium-ion batteries (KIBs). Benefitting from its specific layered structure and various oxidation states of V (V2+ to V5+), KVO delivers high reversible capacity of 300 mAh g−1. This works have significant implications in exploiting for potential anode materials, consequently speeding up the development of high-performance KIBs.