LAUSR

Abstract In this work, CuO/Cu2O@C heterostructure polyhedron accumulated by hollow microspheres was obtained through a etching-pyrolysis-oxidation strategy. CuO/Cu2O@C composites, utilized for lithium-ion batteries (LIBs) anodes, exhibited excellent initial discharge specific capacity (1053 mAh g−1 at 0.05 A g−1, initial Coulombic efficiency (ICE) is 70%) and long-cycle life (510 mAh g−1 after 1000 cycles at 1 A g−1). Even after cycle of various current densities (0.05–5 A g−1) for 70 cycles, discharge capacity backtracked to 663 mAh g−1 at 0.05 A g−1. Furthermore, energy storage behavior of CuO/Cu2O@C coexisting with diffusion and capacitance during the cycle was investigated by CV tests at different scanning rate. These exceptional electrochemical performances were ascribed to hollow spherical structure, cross-linked porous carbon network, and the synergy between the two components of CuO and Cu2O, making CuO/Cu2O@C polyhedron one of the promising anode materials for LIBs.