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This work aims at enhancing the cycling stability and rate capability of a CuO-based anode material for lithium-ion batteries. Here porous CuO nanospheres decorated on reduced graphene oxide (CuO-NSs/RGO) have been synthesized by a two-step thermal treatment procedure. The porous CuO nanospheres are assembled by ultra-fine nanoparticles of CuO with a size of ∼15 nm. Such a porous nature endows many merits, improving the lithium storage performances of the CuO-NSs/RGO composite used as a lithium-ion battery anode. The porous CuO-NSs/RGO composite demonstrates superior reversible capacity (753.3 mA h g−1 at 100 mA g−1) and good cycling stability (616.2 mA h g−1 after 200 cycles at 500 mA g−1). In particular, it exhibits an outstanding high-rate capability of 327.3 mA h g−1 even at 5 A g−1. The feasibility of the CuO-NSs/RGO composite as an anode material was further investigated with a commercial LiFePO4 (LFP) cathode for lithium-ion batteries.

Self-assembly of porous CuO nanospheres decorated on reduced graphene oxide with enhanced lithium storage performance