Fabrication and electrochemical performance of core-shell silicon/graphite composite anode material based on graphite matrix

Silicon/graphite with core-shell structure composites were successfully synthetized by spray drying in combination with a following heat-treatment process. Structure and morphology of the composites were characterized by XRD/SEM measurements. Investigated by charge-discharge test (CC), cyclic voltammetry (CV) and electrochemical impedance (EIS), the core-shell silicon/graphite composites coated by citric acid, phenolic resin and glucose have better electrochemical performance than that of the conventional graphite. And with the high initial Coulombic efficiency and high capacity retention rate, the silicon/graphite composite coated by glucose has the best electrochemical performance.