Effect of different oxidants on properties of tin-graphite composite anode material for lithium-ion battery

In this paper, oxidation doping modification of tin-graphite composite anode material, discussing the effect of doping different oxidants on the properties of composites. The structure and morphology were measured by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical properties of the samples were investigated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge and discharge tests. The results showed that the oxidation effect of H2SO4 was better than HNO3 and H2O2. When the tin-graphite composite was oxidized by H2SO4, the material had better electrochemical properties, of which initial specific discharge capacity reached 859 mAh·g−1 at the rate of 0.1C, increasing by 113 and 76 mAh·g−1 compared with the HNO3 and H2O2. The initial discharge specific capacities at rates of 0.2, 0.5, and 1C were 809, 761, and 627 mAh·g−1.