Resin composition for nonaqueous electrolyte secondary battery, separator for nonaqueous electrolyte secondary battery using same, resin composition for electrode mixture layer, electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

摘要

An object of the present invention to provide a resin composition for a nonaqueous electrolyte secondary battery comprising a vinylidene fluoride copolymer having high adhesive strength to the constituent materials of the nonaqueous electrolyte secondary battery, little swelling by the electrolyte, and high solubility in N-methylpyrrolidone do it with The resin composition for a non-aqueous electrolyte secondary battery for solving the above problems includes a vinylidene fluoride copolymer having a structural unit derived from vinylidene fluoride and a structural unit derived from a fluorinated alkyl vinyl compound. The melting point measured according to ASTM D3418 of the vinylidene fluoride copolymer is 105 to 125° C., the mass fraction W a of the structural units derived from the fluorinated alkyl vinyl compound in the vinylidene fluoride copolymer, and the vinylidene fluoride copolymer.The degree of crystallinity D C of the copolymer and the degree of unpurification D A of the vinylidene fluoride copolymer satisfy the following formula (1). 4.7≤W a ×(D C /D A )≤14 (1)