Chemical diffusion coefficient of lithium ion in Li3V2(PO4)3 cathode material

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Abstract

The kinetic properties of monoclinic lithium vanadium phosphate were investigated by potential step chronoamperometry (PSCA) and electrochemical impedance spectroscopy (EIS) method. The PSCA results show that there exists a linear relationship between the current and the square root of the time. The D̃Li values of lithium ion in Li3-xV2(PO4)3 under various initial potentials of 3.41, 3.67, 3.91 and 4.07 V (vs Li/Li+) obtained from PSCA are 1.26 × 10- 9, 2.38 × 10- 9, 2.27 × 10- 9 and 2.22 × 10- 9 cm2·s- 1, respectively. Over the measuring temperature range 15-65 °C, the diffusion coefficient increased from 2.67 × 10- 8 cm2·s- 1 (at 15 °C) to 1.80 × 10- 7 cm2·s- 1 (at 65 °C) as the measuring temperature increased. Crown Copyright © 2009.

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Tang, A., Wang, X., Xu, G., Peng, R., & Nie, H. (2009). Chemical diffusion coefficient of lithium ion in Li3V2(PO4)3 cathode material. Materials Letters, 63(27), 2396–2398. https://doi.org/10.1016/j.matlet.2009.08.005

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