| 초록 |
Due to high ionic conductivity of Na3V2(PO4)3(NVP), stable 3-D structure and high theoretical capacity, NVP is attracting much attention as cathode material of Na-ion system. However, NVP has poor electronic conductivity and it causes poor rate capability and cycle stability. The aim of this research is to form a composites of NVP@rGO (reduced graphene oxide) to further improve electronic conductivity and structural stability, thereby improving the rate capability and cycle stability. The NVP@rGO composites were made by sol-gel method and ice templating method. Electrochemical tests show that NVP@rGO composites has much more excellent cycle stability and rate capability than pristine NVP. The results show that NVP@rGO can be considered as a candidate for cathode materials with long-cycle life and high rate capability in sodium-ion systems. |
