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Electrochemical properties of a poly(ethylene carbonate)-LiTFSI electrolyte containing a pyrrolidinium-based ionic liquid

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Abstract

A novel polymer electrolyte membrane comprising poly(ethylene carbonate) (PEC), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt, and N-n-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr14TFSI) ionic liquid is prepared by a solvent-free procedure, combining annealing and hot-pressing. The electrochemical properties of the electrolyte are investigated in terms of ionic conductivity, Li transference number (t Li+), and electrochemical stability by a combined study involving electrochemical impedance spectroscopy (EIS), chronoamperometry, and voltammetry. The thermal characteristics are assessed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results reveal an ionic conductivity of a PEC-Pyr14TFSI-LiTFSI electrolyte of the order of 10−5 S cm−1 at 80 °C and t Li+ as high as 0.66 with the intrinsic amorphous nature of the PEC matrix. Furthermore, a Li polymer cell coupling LiFePO4 cathode and the electrolyte is assembled and galvanostatically cycled. The result of this charge-discharge test demonstrates a 3.5-V battery which can be used at 80 °C and a current rate of C/20, delivering a reversible capacity of the order of 150 mAh g−1.

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Acknowledgments

KK acknowledges financial support from the Program for Leading Graduate Schools of Tokyo University of Agriculture and Technology organized by the Japan Society for the Promotion of Science (JSPS), Japan. BS acknowledges the Italian Institute of Technology (IIT) within the “REALIS” project and JH within the Regione Lazio (Italy) project. We also thank Dr. Giovanni Batista Appetecchi (ENEA, Italy), Dr. Maria Assunta Navarra, and Dr. Judith Serra Moreno (Sapienza University of Rome) for their kind cooperation to assure the completion of this work.

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Authors and Affiliations

  1. Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, 184-8588, Japan

    Kento Kimura & Yoichi Tominaga

  2. Department of Chemistry, Sapienza University of Rome, 00185, Rome, Italy

    Jusef Hassoun & Stefania Panero

  3. Italian Institute of Technology, 16163, Genoa, Italy

    Bruno Scrosati

  4. Global Innovation Research Organization, Tokyo University of Agriculture and Technology, Tokyo, 184-8588, Japan

    Bruno Scrosati

Authors
  1. Kento Kimura
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  2. Jusef Hassoun
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  3. Stefania Panero
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  4. Bruno Scrosati
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  5. Yoichi Tominaga
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Corresponding author

Correspondence to Yoichi Tominaga.

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Kimura, K., Hassoun, J., Panero, S. et al. Electrochemical properties of a poly(ethylene carbonate)-LiTFSI electrolyte containing a pyrrolidinium-based ionic liquid. Ionics 21, 895–900 (2015). https://doi.org/10.1007/s11581-015-1370-x

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  • DOI: https://doi.org/10.1007/s11581-015-1370-x

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