Constructing CuCo2O4/N‑doped reduced graphene oxide hybrid hollow spheres serve as an anode for sodium-ion batteries
Construction of high-capacity anode is an essential for sodium-ion batteries (SIBs), but it remains grand challenges. Here, we design a facile and novel tactic to fabricate hierarchical CuCo2O4/N-doped reduced graphene oxide (CuCo2O4/N-rGO) hollow hybrid nanospheres, which is further applied as anode materials for SIBs firstly. In this tactic, the highly porous structure of CuCo2O4/N-rGO is fabricated using the mesoporous silica nanospheres as the reactant template. The unique hollow structure produced by the hybrid nanospheres can not only significantly reduce the energy consumption during the diffusion of sodium ions, but also improve the electrical conductivity. CuCo2O4/N-rGO delivered the capacity with 345 mAh g−1 after 50 cycles at 2 A g-1. The CuCo2O4/N-rGO manifested high capacity and efficiency of sodium storage, excellent cycle stability and brilliant rate capability.