Resin composition, coating film using same, and electrolyte

A resin composition, comprising:

• a polycarbonate resin comprising a constituent unit represented by the following general formula (1):
• wherein
• R1 to R4 and R11 to R14 each independently represent hydrogen, fluorine, chlorine, bromine or iodine, or an alkyl group containing 1 to 20 carbon atoms, an aryl group containing 6 to 12 carbon atoms, an alkenyl group containing 2 to 12 carbon atoms, an alkoxy group containing 1 to 5 carbon atoms, or an aralkyl group containing 7 to 17 carbon atoms, each of which optionally has a substituent,
• a represents an integer of 1 to 1,000, and
• X represents the following:
• wherein, R5 and R6 each independently represent hydrogen, fluorine, chlorine, bromine or iodine, or an alkyl group containing 1 to 20 carbon atoms, an alkoxy group containing 1 to 5 carbon atoms, or an aryl group containing 6 to 12 carbon atoms, each of which optionally has a substituent, or R5 and R6 bind to each other to form a carbocyclic ring containing 5 to 20 carbon atoms, or a heterocyclic ring having 5 to 12 elements,
• R7 and R8 each independently represent hydrogen, fluorine, chlorine, bromine or iodine, or an alkyl group containing 1 to 9 carbon atoms, an alkoxy group containing 1 to 5 carbon atoms, an alkenyl group containing 2 to 12 carbon atoms, or an aryl group containing 6 to 12 carbon atoms, each of which optionally has a substituent, and
• b represents an integer of 0 to 20;
• and
• a carbonate-based organic solvent, wherein
• a content of the polycarbonate resin in the resin composition is 0.05% to 50% by mass,
• a content of the carbonate-based organic solvent in the resin composition is 50% to 99.5% by mass, and
• a total percentage of constituent units represented by the following formulae (2) to (4) in all of the constituent units represented by the general formula (1) is 0% to 75% at a molar percentage: