| 초록 |
In this study, graphene has been employed to serve as a structure that can support the silicon nanoparticles (Si NPs) in Li-ion battery electrodes, by which the drawback of large volume expansion and poor electronic conductivity upon charge-discharge cycling can be significantly suppressed. However, since the graphene nanosheets (GNSs) are prone to restack to form graphite, it is expected to encounter the imbalanced composition and morphology. To overcome this problem, therefore, we introduce the 3-phase electrodes comprised of zero-dimensional (0D) Si NPs, one-dimensional (1D) V2O5 nanowires (NWs) and two-dimensional (2D) GNSs. In particular, 1D V2O5 NWs can provide a role of binding the composite constituents homogeneously. Notably, they form a structure of interconnected networks that minimizes the volume change of Si NPs during repeated cycling. As a result, ternary composites exhibit dramatically enhanced electrochemical performance of high storage capacity and cycling stability. |
