Mild solution synthesis of graphene loaded with LiFePO4–C nanoplatelets for high performance lithium ion batteries

Abstract

To reduce the reaction time, electric energy consumption and the need for high pressure as well as unsafe conditions, we developed an easy and efficient method for the synthesis of a LiFePO₄–graphene–C composite. The cathode material was fabricated in situ in an open system by microwave-assisted solvent treatment. The disc-shaped LiFePO₄ nanoparticles were 50–100 nm in size and well dispersed on the surface of the graphene. The cyclic voltammograms, charge–discharge profiles and electrochemical impedance measurements indicated that the electrochemical performances of the LiFePO₄–graphene–C were better than those of LiFePO₄–graphene and LiFePO₄–C composites. The LiFePO₄–graphene–C cathode delivered a capacity of 160.1 mA h g⁻¹ at 0.1 C rate and showed a decay rate of no more than 0.09% per cycle. The effect of graphene on the structure and performance of the composites was investigated.