| 초록 |
Silicon (Si) has been considered as one of the most remarkable anode materials for next-generation Li-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 huge volume change when charging/discharging, 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. Herein, Si@graphene nanoflakes (GF) composite was prepared by electrostatic interaction between aminated SiO2 layer on Si and GOF and following thermal annealing and HF treatment makes Si@SiO2@GOF into targeting material. Furthermore, GF coated 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 anode material. As a result, the Si@GF composite realized the significantly superior capacity and capacitive stability. |
