▎ 摘　　要

In the present paper, we demonstrate a facile high- temperature solid-state route to synthesis two-phase cobalt phosphide/graphene nanocomposite and assess its potential as anode material for Li-ion batteries. The synthesized CoP-Co2P/ RGO composite shows a flake-like structure consisted of many cobalt phosphide nanospheres densely aggregated on the surface of the RGO nanosheets which in turn causes a twofold increase in the surface area from 15 m(2).g(-1) to 30 m(2).g(-1) and decreasing the mean pore diameter from * 2-95 nm to * 1-3 nm in comparison with the pristine CoP-Co2P sample. The test results confirm the reversibility of the electrochemical reactions of the prepared anode material in the first 10 cycles. Compared to the pristine CoP-Co2P sample, CoP-Co2P/RGO nanocomposite exhibits 60 and 71% increase in the lithiation (118 mAh.g(-1)) and delithiation (12 mAh.g(-1)) capacities at 200 mA.g(-1). The improved battery performance of the CoP-Co2P/RGO electrode is attributed to its highly-porous structure, high capacity of CoP, high electrical conductivity of graphene and Co2P, and the ability of graphene in buffering the volume expansion during cycling.