钼掺杂磷酸钒锂正极材料的制备及其电化学性能研究

doi:10.61558/2993-074X.2889

电化学（中英文） ›› 2012, Vol. 18 ›› Issue (2): 113-117. doi: 10.61558/2993-074X.2889

• 化学电源近期研究专辑（武汉大学杨汉西教授主编） • 上一篇下一篇

钼掺杂磷酸钒锂正极材料的制备及其电化学性能研究

唐致远^1*, 袁威¹, 闫继¹, 毛文峰¹, 马莉²

1. 天津大学化工学院应用化学系天津 300072； 2. 迈科科技有限公司广东 523800

收稿日期:2011-11-24 修回日期:2011-12-29 出版日期:2012-04-28 发布日期:2012-01-14
通讯作者: 唐致远 E-mail:zytang@tju.edu.cn
基金资助:
国家自然科学基金（No. 20973124）和广东省重大科技专项（No. 2009A080208001）资助

Preparation and Electrochemical Performance of Mo-doped Li3V2(PO4)3/C Cathode Materials

TANG Zhi-Yuan^1*, YUAN Wei¹, YAN Ji¹, MAO Wen-Feng¹, MA Li²

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China; 2. McNair Technology Co., Ltd., Guangdong, 523800, China

Received:2011-11-24 Revised:2011-12-29 Published:2012-04-28 Online:2012-01-14
Contact: TANG Zhi-Yuan E-mail:zytang@tju.edu.cn

摘要/Abstract

摘要： 以Li2CO3，NH4H2PO4，V2O5和MoO3为原料，柠檬酸为络合剂和碳源，采用溶胶凝胶法制备了锂离子正极材料Li3MoxV2-x(PO4)3/C (x = 0.01, 0.02和0.03). X射线衍射（XRD）表明，合成的材料具有单一的单斜晶系结构，空间群为P21/n. 扫描电镜（SEM）显示Li3Mo0.02V1.98(PO4)3/C具有均一的表面形貌。恒流充放电测试表明，当x = 0.02时，掺杂后的Li3Mo0.02V1.98(PO4)3具有最佳的电化学性能. 在1C倍率下，3.0 ~ 4.3 V电位区间，Li3Mo0.02V1.98(PO4)3/C的首次放电比容量达到122.3 mAh?g-1，循环50周之后，容量没有衰减的迹象；而当x = 0, 0.01和0.03时，首次放电比容量仅分别为117.1 mAh?g-1，115.1 mAh?g-1和116.0 mAh?g-1. 在3C和5C倍率下，样品Li3Mo0.02V1.98 (PO4)3/C仍能保持优异的循环稳定性.

关键词: 正极材料, 磷酸钒锂, 钼掺杂, 溶胶-凝胶

Abstract: The molybdenum-doped Li3V2-xMox(PO4)3/C (x = 0.01, 0.02 and 0.03) cathode materials were prepared with a sol-gel method by using Li2CO3, NH4H2PO4, V2O5 and MoO3 as raw materials, and citric acid as both chelating reagent and carbon source. The X-ray diffraction (XRD) analyses showed that the crystal structure of as-prepared samples is monoclinic with space group P21/n. Scanning electron microscopy (SEM) observations indicated the uniform morphology for Li3Mo0.02V1.98(PO4)3/C sample. Galvanostatic charge/discharge tests revealed that the optimal Mo-doping proportion is x = 0.02, and the best initial discharge capacity of Li3Mo0.02V1.98(PO4)3/C reaches 122.3 mAh?g-1 in the voltage range of 3.0 ～ 4.3 V at 1C rate with almost no capacity loss after 50 cycles. However, at x = 0, 0.01 and 0.03, the initial discharge capacities are 117.1 mAh?g-1，115.1 mAh?g-1 and 116.0 mAh?g-1, respectively. Even at 3C and 5C rates, the Li3Mo0.02V1.98(PO4)3/C sample also exhibits excellent electrochemical performance.

Key words: cathode material, lithium vanadium phosphate, Mo-doping, sol-gel

中图分类号:

O646.21

唐致远, 袁威, 闫继, 毛文峰, 马莉. 钼掺杂磷酸钒锂正极材料的制备及其电化学性能研究[J]. 电化学（中英文）, 2012, 18(2): 113-117.

TANG Zhi-Yuan, YUAN Wei, YAN Ji, MAO Wen-Feng, MA Li. Preparation and Electrochemical Performance of Mo-doped Li3V2(PO4)3/C Cathode Materials[J]. Journal of Electrochemistry, 2012, 18(2): 113-117.

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钼掺杂磷酸钒锂正极材料的制备及其电化学性能研究

Preparation and Electrochemical Performance of Mo-doped Li3V2(PO4)3/C Cathode Materials

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