Importance

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Abstract

Described is an electrode or electrolyte solution for an electrochemical device that can be used in a wider temperature range with good long-term stability. An electrode protection film forming agent contains a compound having a urethane bond and a polymerizable unsaturated bond and preferably represented by general formula (1): A(-NHCO₂—X)_n. A is i) an n-valent C_2-42 hydrocarbon group, ii) a trivalent residue obtained by removing three isocyanate groups from a trimer of a C_2-42 diisocyanate (B), or iii) a divalent residue obtained by removing two isocyanate groups from a urethane prepolymer having isocyanate groups at both ends and being a reaction product of C_2-42 diisocyanate (B) and C_2-20 diol (N). X is a monovalent C_3-42 organic group having a polymerizable unsaturated bond (b), n is an integer of 1 to 6, and when n is 2 or more, multiple X may be the same or different from each other.

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First Claim