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Regularities of ionic solvation and association of lithium difluoro(oxalate)borate in dimethyl carbonate and sulfolane solvent systems

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Abstract

Lithium difluoro(oxalate)borate (LiODFB) is acknowledged as a new type of electrolyte lithium salt with great potential for high-voltage lithium-ion batteries. Utilizing Raman spectroscopy, a conductivity tester, and a viscometer, this study concentrates on the solution structures and properties of LiODFB-solvent systems. The results demonstrated that in the sulfolane (SL) solvent, the main coordination form is among the Li+ cation. The ODFB− anion and SL molecules form an ionic solvation as a contact ion pair (CIP). The content of free Li+ cations is very considerable, which is beneficial to improve the solubility and conductivity of LiODFB in the SL solvent. In the dimethyl carbonate (DMC) solvent, the main coordination form is ionic association as an aggregate (AGG). In addition, the solvent can display the comprehensive superiority of the SL solvent and LiODFB salt when a high concentration is dissolved in the SL-DMC as a mixed solvent.

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Acknowledgements

Financial support was from Natural Science Foundation of China (Grant No. 51371198) and the Natural Science Foundation of Hunan provincial (Grant No. 2017JJ2168).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, Hunan, 410083, China

    Jian Li, Pengyu Meng & Hongming Zhou

  2. Hunan Zhengyuan Institute for Energy Storage Materials and Devices, Changsha, Hunan, 410083, China

    Jian Li & Hongming Zhou

Authors
  1. Jian Li
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  2. Pengyu Meng
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  3. Hongming Zhou
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Corresponding author

Correspondence to Hongming Zhou.

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Highlights

• Describes the solution structures and properties of LiODFB-solvent systems.

• Combines microscopic and macroscopic methods.

• Comprehensive use of SL and DMC solvents combines the advantages of both.

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Li, J., Meng, P. & Zhou, H. Regularities of ionic solvation and association of lithium difluoro(oxalate)borate in dimethyl carbonate and sulfolane solvent systems. Ionics 24, 2147–2155 (2018). https://doi.org/10.1007/s11581-018-2463-0

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  • DOI: https://doi.org/10.1007/s11581-018-2463-0

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