Novel polymers with a rigid oxanorbornyl backbone and oligo(ethylene oxide) ‘brush’ have been synthesized as an alternative solid polymer electrolyte support for lithium ion batteries. The ionic conductivity of lithium bis(trifluoromethane)sulfonimide through the polymer was measured by impedance spectroscopy. The effect of different sample preparation techniques on the conductivity due to variable ambient water content was also explored. The temperature dependence of the conductivity was also investigated and fit to the Vogel-Fulcher-Tammann equation, examining trends in temperature dependence between samples with different oligo(ethylene oxide) lengths, as well as different degrees of polymerization. For example, samples with the highest molecular weight in the n=12 group were found to have an ionic conductivity at 298 K of 5.9 x10<sup>-6</sup> S/cm, while poly(ethylene oxide) would be approximately 1.6 x10<sup>-5</sup> S/cm if crystallization could be inhibited. These polymers are approaching competitive conductivities with poly(ethylene oxide) without the issues of crystallization.

Applications of impedance spectroscopy: Exploring the temperature dependence of ionic conductivity in novel oligo(ethylene oxide) brush homopolymers as solid electrolyte supports

251st National Meeting (2016)

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