▎ 摘　　要

A facile method has been developed to synthesize LiFePO4 nanoparticles that are coated by 5-10 layers (2-4 nm thickness) of polyacenic semiconductor (PAS) with quasi-graphene structure. The PAS is produced from the windward pyrolysis of phenol-formaldehyde (PF) resin gas, and this solid-gas reaction process allows few layers of PAS to be coated on the surface of LiFePO4 homogeneously. Such a thin and homogeneous PAS coating greatly enhances the electronic conductivity of LiFePO4, so does the electrochemical performance. At the rate of 0.1 C, the discharge capacity of the prepared LiFePO4/PAS composite is 166 mAh g(-1), closing to the theoretical value. At a high rate of 5 C, the discharge capacity is as high as 116 mAh g(-1). In addition, this composite shows an excellent long-term cyclability, retaining over 96.5% of its original discharge capacity beyond 500 cycles at the rate of 1 C.