| http://www.w3.org/ns/prov#value | - It is preferable that the foregoing solid electrolyte is composed of a random copolymer having the main chain structure which contains a structural unit having a structure expressed by the following chemical formula 4 and a structural unit expressed by the following chemical formula 5 and electrolyte salt which is soluble in the foregoing random copolymer. where R1 is a group selected from a group
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