| 초록 |
Although Silicon (Si) has been considered as one of the most promising anode materials for Li-ion batteries (LIBs), it suffers from drastic volume expansion (~300%) upon Li insertion, resulting in severe capacity fading. To overcome these obstacles, we present a novel ternary nanocomposite of Si, Cobalt oxide, and reduced graphene oxide (rGO) for LIB anodes. In particular, cobalt oxide hollow structures of the Si@Cobalt oxide core-shells enlarged the contact area of the electrode with electrolyte thereby facilitating fast transportation of electrons and Li ions during cycling. Moreover, rGO nanosheets enhanced the electrochemical performance of the anodes due to their good structural flexibility and electrical conductivity. As a result, the Si@Cobalt oxide/rGO ternary nanocomposite achieved the significantly improved reversible capacity, steady cycleability, and excellent rate capability. |
