| abstract |
The present invention relates to a high ion conductive solid electrolyte that satisfies the two problems of realizing high ion conductivity and preventing size change by suppressing swelling at the same time, and a fuel cell and other electrochemical system using the solid electrolyte. provide. A modified group comprising at least one inorganic compound selected from a silicic acid compound, a tungstic acid compound, a molybdic acid compound, a stannic acid compound or a zirconic acid compound and polyvinyl alcohol, wherein the polyvinyl alcohol satisfies the following general formula: The present invention provides a high ion conductive solid electrolyte containing a composite compound into which is introduced. In the formula, Hi represents mol% of the i-th type modifying group with respect to the total number of moles of the hydroxyl site when m types of modifying groups are attached to the hydroxyl group of polyvinyl alcohol, and Pi represents the modifying group at the hydroxyl site of polyvinyl alcohol. Represents the average molecular weight of the side chain moiety of the modified group of the i-th species when m is attached. [Expression 4] [Selection figure] None |