Porous CoP@RGO With Pseudocapacitance Characteristics for Lithium Ion Storage

Abstract

Transition metal phosphides (TMPs) have the advantages of large theoretical capacity, good thermal stability and low cost, are widely concerned as potential electrode materials for lithium ion battery (LIBs). Herein, a mild method was used to load CoP on graphene oxide to prepare porous CoP@RGO materials. The CoP@RGO exhibits an excellent electrochemical performance due to its good porosity and excellent electronic conductivity. The initial discharge specific capacity of the CoP@RGO electrode reaches 1210 mAh g-1,  after 50 cycles, the discharge specific capacity still reaches 745.25 mAh g-1. The outstanding performance of the CoP@RGO provides not only a novel insight into the modulated volume expansion of anode but also one of the most effective strategies for large-scale production of graphene-loaded new phosphide electrodes. The pseudocapacitance-controlled charge storage contributions of 80.2% at 0.8 mV s-1 sweep rates, which shows it exhibits higher pseudocapacitance -controlled charge storage contributions.