Ion Transport in the Polymer Electrolytes Formed Between Poly(ethylene succinate) and Lithium Tetrafluoroborate

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Abstract
Solid electrolyte complexes of poly(ethylene succinate), PESc, and were prepared by heating the salt with the molten polymer. The complexes were completely amorphous over the concentration range 1:1 to 3:1 polymer repeat units:metal cation. At salt concentrations above the 1:1 composition, a salt phase was present, and at salt concentrations less than 3:1, free crystalline polymer was observed. Within the 1:1 to 3:1 concentration range, increasing salt concentration was accompanied by decreasing conductivity, and increasing glass transition temperatures. This behavior is discussed in terms of free‐volume theory, with dynamical corrections.

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