Improved sodium storage properties of Zr-doped Na3V2(PO4)2F3/C as cathode material for sodium ion batteries
Improved sodium storage properties of Zr-doped Na3V2(PO4)2F3/C as cathode material for sodium ion batteries
复制标题
Zr掺杂Na3V2(PO4)2F3/C作为钠离子电池正极材料改善钠储存性能
DOI：
10.1016/j.ceramint.2020.08.006
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发表时间：
2020-12-15
影响因子：
5.2
通讯作者：
Ren, Yurong
中科院分区：
文献类型：
--
作者：
Wang, Mingxue;Wang, Kun;Ren, Yurong
To improve the intrinsic electronic conductivity of Na3V2(PO4)(2)F-3 (NVPF), zirconium (Zr) was introduced into the NVPF/C compound through a carbothermal reduction reaction with citric acid as the carbon source. The effects of Zr4+ doping on the crystal structure and morphology of the as-prepared materials were analyzed. Electrochemical and kinetic properties of the samples were investigated by galvanostatic charge-discharge, CV and EIS test. It is confirmed that moderate Zr4+ doping can improve the electrochemical performance of NVPF. Among all Na3V2-xZrx(PO4)(2)F-3/C (x = 0, 0.01, 0.05, 0.1) samples, Na3V1.95Zr0.05(PO4)(2)F-3/C shows the best rate and cycle performance. It exhibits the highest specific capacity of 121.8 and 110.3 mAh/g at 0.2 and 10 C, respectively, and maintains a capacity retention of approximately 83.6% after 1000 cycles at 5 C. The kinetic properties results show that the excellent electrochemical performance of Na3V1.95Zr0.05(PO4)(2)F-3/C can be attributed to the increase in electronic conductivity and ion diffusion coefficient.
