N/S Co-modified carbon/Na3V2(PO4)3 with high rate capability for Zn-ion storage

Authors：Liang, Yongqing; Xu, Shaolong; Lu, Xinchao; Zhang, Chenxia; Liu, Zheng; Zou, Pintian; Lv, Yiju^*; Huang, Bin^*

Source：New Journal of Chemistry, 2023, 47(12): 5715-5722.

DOI：10.1039/d2nj06264j

• LONG CYCLE
• CATHODE MATERIALS
• ZINC
• PERFORMANCE
• BATTERIES
• HYBRID
• NA3V2(PO4)(3)
• COMPOSITE
• ENERGY
• OXIDE

Na3V2(PO4)(3) (NVP) with a NASICON structure serves as one of the most promising cathode materials for aqueous zinc-ion batteries (AZIBs) due to its stable crystal structure and fast ion mobility. Nevertheless, its electrochemical properties are still unsatisfactory because of its poor electrical conductivity. A simple hydrothermal method is used to prepare carbon-coated NVP (NVP-C) and N/S co-doped carbon-coated NVP (NVP-C-NS) composites. The results demonstrate that the NVP-C-NS composite exhibits superior capacity and rate capability. After 100 cycles at a high current density of 1000 mA g(-1), the reversible capacity of the NVP-C-NS composite can reach 115 mA h g(-1), while pure NVP-C is capable of achieving only 83 mA h g(-1) at the same current density, and 94.8% of the capacity of the NVP-C-NS composite and only 90% of the NVP-C material are retained. The excellent electrochemical performance of the NVP-C-NS composite is mainly due to the high carbon content (13.08 wt% vs. NVP-C with 4.8 wt%.) and high conductivity (3.72 x 10(-4) S cm(-1)vs. NVP-C with 1.20 x 10(-4) S cm(-1)). The introduction of more active sites and defects after N/S doping and the increased specific surface area can provide a larger electrochemical contact surface for electrochemical reactions. Furthermore, the practicality of the NVP-C-NS//Zn battery is evaluated by lighting up LED bulbs. This work provides a reference for the development of Na3V2(PO4)(3) as a cathode material for AZIBs.

• Institution
  桂林理工大学