▎ 摘　　要

Lithium iron(II) phosphate (LiFePO4) particles were simultaneously modified via reduced graphene oxide (rGO) and manganese ion(II) (Mn2+) through a facile one-step method. X-ray photoelectron spectroscopy unravels that the formation of Mn-O bond originated from Mn2+ ion and fringe oxygen atoms of LiFePO4, which is beneficial for the rate capability of cathode. As cathode for lithium-ion battery, the as-prepared rGO/Mn-LiFePO4 composite exhibits excellent electrochemical properties. Its discharge-specific capacity is 159 mAh g(-1) at 1 C after 800 cycles with capacity retention of 92%. Even at a high rate of 10 C, the rGO/Mn-LiFePO4 composite is still capable of delivering 140 mAh g(-1) of discharge-specific capacity, indicating its excellent rate capability and cycle stability. It was demonstrated that the simultaneous modification of Mn2+ and rGO does not destroy the olivine structure of LiFePO4, but it can stabilize the crystal structure, decrease the electrode polarization, enhance the electronic conductivity and Li+ diffusion coefficient, and thus improve its cycling and high-rate capability.