Vanadium substitution of LiFePO 4 cathode materials to enhance the capacity of LiFePO 4 -based lithium-ion batteries

Ching Yu Chiang, Hui Chia Su*, Pin Jiun Wu, Heng Jui Liu, Chih Wei Hu, Neeraj Sharma, Vanessa K. Peterson, Han Wei Hsieh, Yu Fang Lin, Wu-Ching Chou, Chih Hao Lee, Jyh Fu Lee, Bor Yuan Shew

*Corresponding author for this work

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Abstract

The mechanism of enhancing the capacity of the LiFePO 4 cathodes in lithium ion batteries by the addition of a small amount of vanadium, which locate on the lithium site and induce lithium vacancies in the crystal structure, is reported in this article. As a result, the capacity increases from 138 mAh/g found for pristine LiFePO 4 to 155 mAh/g for the V-added compound, and the conductivity increases from 4.75 × 10 -4 S/cm for the LiFePO 4 without V addition to 1.9 × 10 -2 S/cm for the V-added compound. A possible model to facilitate the enhancement of conductivity and capacity is described with evidence supported by X-ray powder diffraction, X-ray absorption spectroscopy, and neutron powder diffraction data.

Original languageEnglish
Pages (from-to)24424-24429
Number of pages6
JournalJournal of Physical Chemistry C
Volume116
Issue number46
DOIs
StatePublished - 4 Dec 2012

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    Chiang, C. Y., Su, H. C., Wu, P. J., Liu, H. J., Hu, C. W., Sharma, N., Peterson, V. K., Hsieh, H. W., Lin, Y. F., Chou, W-C., Lee, C. H., Lee, J. F., & Shew, B. Y. (2012). Vanadium substitution of LiFePO 4 cathode materials to enhance the capacity of LiFePO 4 -based lithium-ion batteries. Journal of Physical Chemistry C, 116(46), 24424-24429. https://doi.org/10.1021/jp307047w