Vanadium substitution of LiFePO4 cathode materials to enhance the capacity of LiFePO4-based lithium-Ion batteries

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 x 10(-4) S/cm for the LiFePO(4) without V addition to 1.9 x 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. © 2012, American Chemical Society.

Keywords

Granular materials, Absorption, Cathodes, Lithium ion batteries, Vanadium, Neutron diffraction, Defects

Citation

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 LiFePO4 cathode materials to enhance the capacity of LiFePO4-based lithium-Ion batteries. Journal of Physical Chemistry C, 116(46), 24424-24429. doi:10.1021/jp307047w