Graphene improving lithium-ion battery performance by construction of NiCo2O4/graphene hybrid nanosheet arrays

Graphene-based NiCo2O4 nanosheet arrays directly grown on nickel foam have been successfully synthesized. The incorporation of graphene into the composites array shows significantly improved lithium storage properties than NiCo2O4 nanosheets. The graphene not only serves as a conductive network to increase the conductivity of the NiCo2O4, but also can offer effective buffering to accommodate the lithiation-induced stress which is beneficial to lithium storage and cycling stability.