Precipitation synthesis and enhanced electrochemical performance of graphene-modified LiMn2O4 for lithium-ion batteries

The graphene-modified LiMn 2 O 4 cathode material was synthesized by precipitation method. X-ray diffraction (XRD), scanning electron microscopy (SEM), and fourier transform infrared (FITR) showed LiMn 2 O 4 had been successfully combined with the graphene. The charge and discharge tests and electrochemical impedance spectroscopy (EIS) were used to study electrochemical properties of as-synthesized material. The results showed that the electrochemical properties of the graphene oxide–supported LiMn 2 O 4 were superior to that of the LiMn 2 O 4 material. The initial discharge capacity of the graphene-modified LiMn 2 O 4 material reached 127 mAh g −1 . After 100 cycles, it still had a capacity retention rate of 96.2%. Enhanced electrochemical performance of graphene-supported LiMn 2 O 4 could be attributed to the establishment of fast Li + channels and structural stability after coating LiMn 2 O 4 with the graphene.