Vertical graphene composite silicon anode material

It is made by growing vertical graphene on the surface of nano silicon powder. This vertical graphene has the characteristics of good conductivity, flexibility, and non-agglomeration, which can effectively improve the conductivity of nano silicon powder and relieve the volume expansion of silicon powder, thereby obtaining A new type of silicon carbon anode material with high capacity, good cycle stability and outstanding rate performance. At a current density of 0.1 A/g, the first capacity is as high as 2696.1 mAh/g, and the capacity retention rate is as high as 90.6% after 100 cycles. At a current density of 2 A/g, the first capacity is 1403.5 mAh/g, and the capacity remains after 500 cycles. The rate is as high as 80.1%, and the capacity is still as high as 457.9 mAh/g at a current density of 20 A/g. When the full battery is at 0.1 C, the energy density is as high as 516.4 Wh/Kg, and the volume energy density is as high as 1126.5 Wh/L.