Preparation And Electrochemical Performance of Nano Si@Short Hard Carbon Fiber Composites as Anodes for Lithium Batteries

Abstract

The bamboo paper was soaked by the silica sol. After drying, the nano-silicon@short hard carbon fiber was prepared by vacuum high-temperature carbonization treatment followed by grind, which was one-dimensional composite. The structure and morphology of the composite material were characterized by X-ray diffraction and Scanning electron microscopy (SEM). The results show that the diameter of the short hard carbon fiber is about 2∼8 μm and the length is about several tens of microns. The nano-silicon particles are sparsely distributed on the outer wall of the short bamboo charcoal fiber. The adhesion between nano silicon and short hard carbon fiber is strong due to the effect of thermal diffusion and Van der Waals’ force. The prepared nano-silicon@short hard carbon fiber composite was used as a negative electrode material for lithium battery for charge and discharge test. When the current density was 100 mA.g−1, the capacity was only attenuated by 6.54% after 50 cycles. Meanwhile, the composite also exhibits well rate performance.