| 초록 |
Silicon (Si) has been selected as one of the most remarkable anode materials for next-generation Li-ion batteries (LIBs) because of its high theoretical capacity (3574mAh/g). However, Si anode suffers from ruinous volume change when cycling, finally, performance degradation is induced due to electrical contact loss with current collector and microscopic disintegration of silicon fractures. In addition, because silicon has poor electrical conductivity, performance at high current induce formation of unstable SEI on silicon. Herein, Si@graphene nanoflakes (GF) composite was fabricated by electrostatic interaction between positively charged SiO2 layer on Si and GOF and following thermal reduction makes Si@GOF into Si@GF. Furthermore, Si@GF core improved the rate performance of silicon and cycling stability of the anodes due to buffering effect for volume change of anode material. As a result, the Si@GF composite realized the significantly superior capacity and capacitive stability. |
