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Effects of acetonitrile on electrochemical performance of LiFePO4/Li

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Abstract

It is widely accepted that lithium hexafluorophosphate (LiPF6) is the best electrolyte for making lithium ion battery because of its excellent performance. Using acetonitrile (ACN) solvent to pretreat LiPF6 is a green chemical process. However, ACN residue will be introduced into the electrolyte during the preparation process. The effects of ACN on the electrochemical performance of LiFePO4/Li are evaluated in this study. The study results showed that the battery capacity is improved by the addition of 1 wt % ACN to the electrolyte. Surface analyses of the battery cathodes using XPS and FTIR suggested that the cathodes be oxidized in all electrolytes with 0, 1, and 5 wt % ACN, resulting in the formation of Li2CO3, LiF, and ROCO2Li on their surfaces. Li(ACN)4PF6, which reduces the battery capacity, was especially formed on the surface of the cathode in the electrolyte containing 5 wt % ACN.

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Authors and Affiliations

  1. School of Chemical Engineering, Sichuan University Chengdu, Sichuan, 610065, China

    Q. Peng, Z. Y. Zhang, L. Yang & X. L. Wang

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  1. Q. Peng
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  2. Z. Y. Zhang
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  3. L. Yang
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  4. X. L. Wang
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Corresponding author

Correspondence to X. L. Wang.

Additional information

Published in Russian in Elektrokhimiya, 2015, Vol. 51, No. 4, pp. 393–398.

The article is published in the original.

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Peng, Q., Zhang, Z.Y., Yang, L. et al. Effects of acetonitrile on electrochemical performance of LiFePO4/Li. Russ J Electrochem 51, 339–344 (2015). https://doi.org/10.1134/S1023193515040096

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  • DOI: https://doi.org/10.1134/S1023193515040096

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