Abstract
We use impedance spectroscopy to investigate ionic conduction and dielectric response and mechanical tests to study mechanical properties of cross-linked epoxy-based solid polymer electrolytes (SPEs) containing a mixture of succinonitrile (SN) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) with different ratio of mechanically robust epoxy and ionic conducting SN/LiTFSI mixture content. Increasing SN/LiTFSI mixture content results in a proportional increase in ionic conductivity σ DC , and its maximum conductivity approaches σ DC ∼10-4 S/cm at room temperature. This is consistent with accelerating the observed relaxation processes such as ion rearrangement and segmental motion, upon adding further SN/LiTFSI content. The combination of epoxy and SN/LiTFSI also leads to a large increase in static dielectric constant ε s ∼75, which is higher than the prediction from the Landau and Lifshitz mixing rule, compared to the host epoxy (ε s ∼4) and pure SN/LiTFSI mixture (ε s ∼53). On the other hand, the addition of SN/LiTFSI decreases Young’s modulus (E), compared to the neat epoxy, and approaches E∼10 MPa at room temperature, reflecting a trade-off relationship between E and σ DC .
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Acknowledgment: This work was supported by a Research Grant of Pukyong National University (2016 year).
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Choi, U.H., Jung, B.M. Ion Conduction, Dielectric and Mechanical Properties of Epoxy-Based Solid Polymer Electrolytes Containing Succinonitrile. Macromol. Res. 26, 459–465 (2018). https://doi.org/10.1007/s13233-018-6061-9
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DOI: https://doi.org/10.1007/s13233-018-6061-9