| 초록 |
Silicon (Si) has been considered as one of the most remarkable anode materials for next-generation lithium ion batteries (LIBs) owing to its high theoretical capacity (4200 mAh/g), which is over 11 times higher than that of graphite. However, Si anode suffers from dramatic volume change when cycling, resulting in electrical contact loss with current collector and capacity loss. In addition, silicon has poor electrical conductivity to receive the electrons from current collector. In this report, Si@graphene nanoflakes (GNF) complex was prepared by electrostatic interaction between aminated SiO2 layer on Si and GOF and following thermal reduction and wet etching with HF makes Si@SiO2@GOF into target material. Furthermore, GNF layer on Si core improved the rate performance of silicon-based cell and cycling stability of the anodes due to buffering effect for volume change of material. Consequently, the Si@GNF composite realized the significantly superior capacity and capacitive stability. |
