| Summary: | Potassium-ion batteries (KIBs) represent one of the most promising alternatives to lithium-ion batteries (LIBs) considering the potential low cost and abundant potassium resource. In this work, we demonstrate a core-shell structured sponge cathode for KIBs, where amorphous V2O5 uniformly coats on carbon nanotube (CNT) sponge via atomic layer deposition (ALD). The V2O5@CNT sponge shows several advantages as cathode: (1) the three-dimensional (3D) conductive network of CNT sponge offers a fast electron transport pathway, (2) the porous nature and high surface area of CNT sponge enables enough access for electrolyte to V2O5, (3) the amorphous structure of V2O5 offers a fast kinetics upon K-ion insertion/deinsertion. The V2O5@CNT sponge cathode delivers a high capacity of 206 mA h/g and moderate cycling and rate performance in common carbonate-based electrolyte system. Keywords: Potassium ion batteries, Atomic layer deposition, Amorphous vanadium oxide, Carbon nanotube sponge
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