Effect of Vanadium Incorporation on Electrochemical Performance of LiFePO4 for Lithium-Ion Batteries

被引：113

作者：

Zhang, Lu-Lu ^{[1
]}

Liang, Gan ^{[2
]}

Ignatov, Alexander ^{[3
,4
]}

Croft, Mark C. ^{[3
,4
]}

Xiong, Xiao-Qin ^{[1
]}

Hung, I-Ming ^{[5
]}

Huang, Yun-Hui ^{[1
]}

Hu, Xian-Luo ^{[1
]}

Zhang, Wu-Xing ^{[1
]}

Peng, Yun-Long ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mold Technol, Wuhan 430074, Hubei, Peoples R China

[2] Sam Houston State Univ, Dept Phys, Huntsville, TX 77341 USA

[3] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[4] Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA

[5] Yuan Ze Univ, Dept Chem Engn & Mat Sci, Yuan Ze Fuel Cell Ctr, Tao Yuan 320, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 27期

基金：

国家高技术研究发展计划(863计划); 美国国家科学基金会;

关键词：

ELECTRODE MATERIALS; CATHODE MATERIAL; INSERTION PROPERTIES; PHOSPHATE; IRON; FLUOROPHOSPHATE; CELLS; AL3+; V3+;

D O I：

10.1021/jp2034906

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of LiFe1-xVxPO4/C samples have been successfully prepared using a two-step solid-state reaction route. The effect of vanadium incorporation on the performance of LiFePO4 has systematically been investigated with X-ray diffraction, Raman spectroscopy, charge/discharge measurements, and cyclic voltammetry tests. It is found that V incorporation significantly enhances the electrochemical performance of LiFePO4. Particularly, the LiFePO4/C sample with 5 at. % vanadium doping exhibits the best performance with a specific discharge capacity of 129 mAh g(-1) at 5.0 C after 50 cycles; the capacity retention ratio is higher than 97.5% at all C rates from 0.1 to 5.0 C. X-ray absorption spectroscopy results show that the valence of V in LiFe0.95 V0.05PO4/C is between +3 and +4. It is confirmed that the samples with x <= 0.03 are in single phase, whereas the samples with 0.05 <= x < 1.00 contain two impurity phases: Li3V2(PO4)3 and LiVOPO4. A clear feature of vanadium incorporation in LiFePO4 has been specified.

引用

页码：13520 / 13527

页数：8

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