Effect of Cr3+doping on the electrochemical performance of Na3V2(PO4)2F3/C cathode materials for sodium ion battery

被引：17
|
作者：
Yi, Xiaoli [1 ,2 ]
Luo, Hongyue [1 ,2 ]
Zhou, Yongmao [1 ,2 ]
Feng, Shihao [1 ,2 ]
Wang, Jiexi [1 ,2 ,3 ]
Wang, Zhixing [1 ,2 ,3 ]
Duan, Jianguo [4 ]
Wang, Ding [4 ]
Guo, Huajun [1 ,2 ,3 ]
Yan, Guochun [1 ,2 ,3 ]
机构：
[1] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China
[2] Cent South Univ, Engn Res Ctr, Minist Educ Adv Battery Mat, Changsha 410083, Peoples R China
[3] Cent South Univ, Hunan Prov Key Lab Nonferrous Value Added Met, Changsha 410083, Peoples R China
[4] Kunming Univ Sci & Technol, Fac Met & Energy Engn, Kunming 650093, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2023年 / 437卷
基金：
中国国家自然科学基金;
关键词：
Sodium-ion battery; Cr-doping; Sol-gel; NA3V2(PO4)(2)F-3/C; LITHIUM; CR3+;
D O I：
10.1016/j.electacta.2022.141491
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Na3V2(PO4)2F3 is considered as one of the most promising cathode materials for sodium-ion batteries (SIBs). However, the low electronic conductivity of this material severely restricts its electrochemical performance. Herein, Cr-doped Na3V2(PO4)2F3/C material was synthesized by a simple sol-gel method, and the effects of Cr3+ doping on the structure, morphology and electrochemical performance were systematically investigated. The optimized material Na3V2-xCrx(PO4)2F3/C (x = 0.05) exhibits high initial discharge capacity of 101.9 mAh g-1 at 10 C and keep a capacity retention of 68.7 % after 1000 cycles. The improved electrochemical performance can be attributed to the higher crystallinity, improved intrinsic electronic conductivity and sodium ion diffusion coefficient due to the doped Cr3+, which accelerates the electron transport and charge transfer rate. The opti-mized Cr-doped Na3V2(PO4)3F3/C material obtained in this work can promote the practical application of Na3V2(PO4)3F3 cathode.
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页数：7
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