Cu9S5-nanowire-pinned-WS2 sheets on hollow cubic carbon for synergistic promotion in K-ion battery performance

Cu 9 S 5 -nanowire-pinned-WS 2 sheets on a hollow cubic carbon multi-level composite structure exhibits a high capacity (406 mA h g −1 after 150 cycles at 200 mA g −1 ) and excellent rate performance (246 mA h g −1 at 20 A g −1 ) as an anode material of PIBs.