▎ 摘　　要

In this research, LiFePO4@C nanoparticles anchored on conductive S-doped graphene, fabricated using the sol-gel approach followed by the calcination process, have shown superior Li-storage properties. Detailed characterizations of the properties of the designed LiFePO4@C/S-doped graphene nanocomposite have been carried out. In the resulting nanocomposite, the LiFePO4@C nanocrystals are uniformly adhered to the two-dimensional S-doped graphene sheet. Benefiting from the added S-doped graphene which can increase the transportation of the electrons/Li-ions of the electrode material, the LiFePO4@C/S-doped graphene cathode presents superior Li-storage performances including high reversible capacity, outstanding rate capability and excellent cyclic life. For instance, it can display a high initial capacity of 162.9 mAh g(-1) at 0.1 C. Moreover, a stable reversible capacity of 113.6 mAh g(-1) can still be obtained over 400 cycles at 20 C. These results suggest that the advanced LiFePO4@C/S-doped graphene composite is a superior cathode material in lithium energy storage.