A sulfur-doped carbon-enhanced Na3V2(PO4)3 nanocomposite for sodium-ion storage

To promote the electrical conductivity of Na3V2(PO4)3 (NVPO) for sodium-ion storage, sulfur-doped carbon-promoted Na3V2(PO4)3 ([email protected]) composite has been firstly fabricated using a sol-gel route assisted with a solid-state reaction process. In this designed cathode material, NASICON-type NVPO nanocrystals are homogeneously coated with a thin sulfur-doped carbon film. The introduced sulfur-doped carbon coating acts as a conductive bridge between NVPO particles, thereby improving the electrical conductivity of NVPO electrode. Compared to the carbon-decorated NVPO ([email protected]) material, the designed [email protected] displays superior sodium storage performance because of its good electrical conductivity. It exhibits the high discharge capacities of 110.3 and 105.9 mAh/g at 0.1 and 2 C respectively and presents a 97.8% capacity retention over 300 cycles at 10 C. Therefore, the resulted [email protected] nanocomposite might be a prospective advanced electrode in sodium-ion batteries.