Development in silicon/graphene composite anode materials
Silicon,due to its high theoretical specific capacity(4 200 mAh/g)and low voltage platform(0.4 V),has become a poten-tial negative electrode material for the next generation of lithium-ion batteries.However,during the charging and discharging process of lithium-ion batteries,the silicon has a large volume expansion(>300%)due to the lithium alloy formation,which leads to the rupture of the silicon electrode structure and rapid capacity attenuation.Graphene,with high specific surface area,high electrical conductivity and high tensile strength,has many advantages in improving the performance of silicon anode materials,and is expected to become an i-deal material for modifying silicon anode.In this review,the preparation methods of silicon/graphene composite negative electrode mate-rials are briefly introduced,the latest research progress is summarized,and the research trend of graphene modified silicon negative e-lectrode is prospected.
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