Hybrid NiO/Co3O4 nanoflowers as high-performance anode materials for lithium-ion batteries

Abstract

The construction of advanced nanostructures as well as the hybridization of different active materials are highly desirable for achieving lithium-ion batteries (LIBs) anode with superior electrochemical performance. Herein, we developed a simple solvothermal method, with a subsequent annealing process for the synthesis of flower-like NiO/Co3O4 with dense pores on the petals and investigated its potential as anodes for LIBs. The as-prepared hybridized NiO/Co3O4 anode material exhibited an impressive capacity (1428.8 mAh g−1 at a current density of 0.1 A g−1 after 100 cycles, and 668.6 mAh g−1 at 1 A g−1 after 600 cycles), which is a significant improvement compared with its corresponding building blocks as well as the physical mixture of NiO and Co3O4. This excellent performance is attributed to the unique flower-like porous architecture and the synergetic effect of two electrochemically cooperative anode materials, simultaneously overcoming the conductivity deficiency and capacity fading due to severe volume expansion during cycling. The material design principle and synthesis approach are expected to be useful for other battery electrodes, as well as in other applications such as catalysis, microwave absorption and gas sensing.