▎ 摘　　要

The electrochemical performance especially rate capability of LiMn2O4 is improved by graphene modified via ultrasonic agitation. The pristine LiMn2O4 and LiMn2O4/graphene composite are characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The obtained LiMn2O4/graphene composite shows reversible capacity of 107 mAh g(-1) at 50 C charge/discharge rate. At 55 degrees C, the capacity at 5 degrees C charge/discharge rate for LiMn2O4/graphene is higher than that of pristine LiMn2O4. The electrochemical impedance spectroscopy (EIS) indicates that the charge transfer resistance for LiMn2O4/graphene composite is reduced compared to LiMn2O4 sample.