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Biodegradable poly (ε-caprolactone)/lithium bis(trifluoromethanesulfonyl) imide as gel polymer electrolyte

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Abstract

Poor conductivity and toxic technological garbage of polymer electrolyte has delayed energy storage application in electric vehicles. Biodegradable gel polymer electrolytes (GPEs) based on poly (ε-caprolactone) (PCL) are prepared. PCL is used to immobilize liquid electrolyte containing lithium bis(trifluoromethanesulfonyl) imide, ethylene carbonate, and propylene carbonate. Impedance spectroscopy, X-ray diffraction, and differential scanning calorimetry are used to characterize the ionic conductivity and structural and thermal properties of GPEs, respectively. For jelly-like GPEs, it exhibits liquid-like ionic conductivity of 1.69 × 10−3 S cm−1 at room temperature with a composition ratio (PCL:LiTFSI:EC:PC) of (22.5:7.5:35:35) (w/w). Results show that the polymer matrix forms cross-linked network within the liquid electrolyte, acting like an adhesive to hold the high fluidity liquid molecules. In temperature dependence studies, the GPEs are observed to obey Arrhenius equation indicating that ion transport occurs via hop** mechanism. The findings in XRD and DSC are in good agreement with conductivity results.

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Acknowledgements

This research was funded by the University of Malaya (RG324-15AFR) and the Ministry of Education of Malaysia (FP053-2014A).

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Authors and Affiliations

  1. Centre for Ionics University of Malaya, Kuala Lumpur, Malaysia

    W. N. S. Sajiri & H.J. Woo

  2. Department of Physics, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia

    W. N. S. Sajiri & H.J. Woo

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  1. W. N. S. Sajiri
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  2. H.J. Woo
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Correspondence to H.J. Woo.

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Sajiri, W.N.S., Woo, H. Biodegradable poly (ε-caprolactone)/lithium bis(trifluoromethanesulfonyl) imide as gel polymer electrolyte. Ionics 23, 2657–2662 (2017). https://doi.org/10.1007/s11581-017-2021-1

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  • DOI: https://doi.org/10.1007/s11581-017-2021-1

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