| 초록 |
Silicon (Si) has regarded as one of the most promising anode materials because of its high theoretical capacity (4200 mAh/g). However, Si anode suffers from drastic volume change upon cycling. Therefore, Si anode loses electrical contacts with current collector, resulting in capacity fade. To overcome these obstacles, metal silicates have been considered as good additive to maintain capacitive performance of Si anodes. In this study, Si@Co2SiO4@rGO-nanosheets was prepared by easy ball milling and hydrothermal treatment. In particular, Co2SiO4 hollow structures of the composite enlarged the contact area of the electrode with electrolyte thereby facilitating fast transportation of electrons and Li ions during cycling. Moreover, void spaces between the Si@Co2SiO4 accommodated the huge volume change of Si during cycling. As a result, the Si@Co2SiO4/rGO ternary nanocomposite achieved the significantly improved reversible capacity, steady cycle life, and excellent rate capability. |
