| 초록 |
Na3V2(PO4)3 is one of the excellent cathode candidates of sodium ion batteries owing to its high theoretical specific capacity (117 mA h g-1) and operating voltage (3.4 V vs. Na/Na+). However, the inferior intrinsic electronic conductivity of NVP limits facile charge transfer, resulting in poor rate capability and long-term cycle stability. In order to overcome these hurdles, studies are being conducted to improve electrical conductivity via forming a composite with a carbon material or doping/substitution of heteroatom. In this work, a composite with reduced graphene oxide (rGO) was fabricated to reduce particle size of NVP, organize a uniform 3D conductive network to minimize capacity loss, and greatly increase electrical conductivity. The composite, called 'BI-NVP', achieved excellent performance of a sodium ion battery and confirmed interfacial stability of NVP-rGO through various post-mortem analysis including HR-TEM and STEM-EELS. |
