Effect of vanadium incorporation on electrochemical performance of LiFePO4 for lithium-ion batteries

Lu Lu Zhang; Gan Liang; Alexander Ignatov; Mark C. Croft; Xiao Qin Xiong; I. Ming Hung; Yun Hui Huang; Xian Luo Hu; Wu Xing Zhang; Yun Long Peng

doi:10.1021/jp2034906

Effect of vanadium incorporation on electrochemical performance of LiFePO4 for lithium-ion batteries

Lu Lu Zhang, Gan Liang, Alexander Ignatov, Mark C. Croft, Xiao Qin Xiong, I. Ming Hung, Yun Hui Huang, Xian Luo Hu, Wu Xing Zhang, Yun Long Peng

School of Arts and Sciences, New High Energy Theory Center

Research output: Contribution to journal › Article › peer-review

117 Scopus citations

Abstract

A series of LiFe_1-xV_xPO₄/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 LiFe-PO₄. 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 LiFe0.95V0.05PO₄/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 LiFePO ₄ has been specified.

Original language	English (US)
Pages (from-to)	13520-13527
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	115
Issue number	27
DOIs	https://doi.org/10.1021/jp2034906
State	Published - Jul 14 2011

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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@article{24403f2aa0cb48f68c4f2212c2dece24,

title = "Effect of vanadium incorporation on electrochemical performance of LiFePO4 for lithium-ion batteries",

abstract = "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 LiFe-PO4. 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 LiFe0.95V0.05PO4/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 LiFePO 4 has been specified.",

author = "Zhang, {Lu Lu} and Gan Liang and Alexander Ignatov and Croft, {Mark C.} and Xiong, {Xiao Qin} and Hung, {I. Ming} and Huang, {Yun Hui} and Hu, {Xian Luo} and Zhang, {Wu Xing} and Peng, {Yun Long}",

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AU - Zhang, Lu Lu

AU - Liang, Gan

AU - Ignatov, Alexander

AU - Croft, Mark C.

AU - Xiong, Xiao Qin

AU - Hung, I. Ming

AU - Huang, Yun Hui

AU - Hu, Xian Luo

AU - Zhang, Wu Xing

AU - Peng, Yun Long

PY - 2011/7/14

Y1 - 2011/7/14

N2 - 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 LiFe-PO4. 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 LiFe0.95V0.05PO4/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 LiFePO 4 has been specified.

AB - 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 LiFe-PO4. 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 LiFe0.95V0.05PO4/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 LiFePO 4 has been specified.

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Effect of vanadium incorporation on electrochemical performance of LiFePO4 for lithium-ion batteries

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