| 초록 |
Although Silicon (Si) has been regarded as one of the most promising due to its high theoretical capacity for Li-ion batteries (LIBs), it suffers from excessive volume expansion (~300%) upon Li insertion, resulting in poor discharge stability and rate capability. In order to improve these performances, Si-Co/reduced graphene oxide (rGO) nanocomposites were prepared by mild ball milling of Si nanoparticles, Cobalt (Co) oxide nanoparticles, and rGO nanosheets, followed by thermal reduction to formation of Si-Co alloy. In particular, Si-Co phase inside the Si domains provides the role of the matrix to alleviate the stress caused by volume change of the Si structure and enhances the electron and ion transport during cycling. Furthermore, rGO nanosheets exhibit the conductive framework, which improves the structural flexibility and electrical conductivity. Therefore, the Si-Co/rGO ternary nanocomposite achieved the high-performance LIBs. |
