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

• Published in: The Journal of physics and chemistry of solids Vol. 167; p. 110746
• Main Authors: Huang, Zan, Luo, Peifang, Jia, Shikui, Zheng, Honghong, Lyu, Zhaochun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2022
• Subjects: Cathode; Na3V2(PO4)3; Rate capability; Sodium-ion storage; Sulfur-doped carbon; Sulfur-doped carbon; Cathode; Na3V2(PO4)3; Rate capability; Sodium-ion storage
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2022.110746

To promote the electrical conductivity of Na3V2(PO4)3 (NVPO) for sodium-ion storage, sulfur-doped carbon-promoted Na3V2(PO4)3 (NVPO@SC) 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 (NVPO@C) material, the designed NVPO@SC 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 NVPO@SC nanocomposite might be a prospective advanced electrode in sodium-ion batteries. •Sulfur-doped carbon-coated Na3V2(PO4)3 nanocomposite has been firstly prepared.•The electrical conductivity of Na3V2(PO4)3 is enhanced by sulfur-doped carbon.•The fabricated cathode displays excellent high-rate capability and stable cyclic-life.