Importance

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Abstract

A polymer electrolyte material composed of a block copolymer having a segment containing an ionic group (hereinafter referred to as an “ionic segment”) and a segment containing no ionic group (hereinafter referred to as a “nonionic segment”), wherein the polymer electrolyte material has a phase-separation structure, and satisfies at least one of the following condition 1 or condition 2: the saturated crystallinity of the polymer electrolyte material is 5% or more and 30% or less, as measured by wide-angle X-ray diffraction; and the ion exchange capacity (IEC) of the polymer electrolyte material is 1.8 meq/g or more and 3.0 meq/g or less, and the product of the IEC (meq/g) of the polymer electrolyte material and the heat of crystallization (J/g) of the polymer electrolyte material, as measured by differential scanning calorimetry analysis, is 35.0 or more and 47.0 or less. Provided is a polymer electrolyte material having good mechanical durability and excellent proton conductivity.

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First Claim