Resin composition, filler-containing resin film for non-aqueous electrolyte secondary battery, and method for producing filler-containing resin film for non-aqueous electrolyte secondary battery

Abstract

An object of the present invention is to provide a filler-containing resin film in which shedding of inorganic materials or the like is suppressed, a resin composition that can be used in production of the filler-containing resin film, and a method for producing the filler-containing resin film. The filler-containing resin film of the present invention is a filler-containing resin film comprising: a vinylidene fluoride copolymer obtained by copolymerizing vinylidene fluoride and a compound represented by formula (1) (in formula (1), R 1 , R 2 , and R 3 are each independently hydrogen atoms, chlorine atoms, or alkyl groups having from 1 to 5 carbons; and X′ is an atomic group having a molecular weight of 472 or less and having a main chain configured from 1 to 19 atoms); and an insulating inorganic filler. The resin film is produced by applying onto a substrate and then drying a resin composition containing the vinylidene fluoride copolymer, the insulating inorganic filler, and an organic solvent.

1 . A separator resin film for insulating a positive electrode and a negative electrode in a non-aqueous electrolyte secondary battery, wherein the separator resin film comprises a fluororesin film formed from a resin composition, the resin composition comprising a vinylidene fluoride copolymer obtained by copolymerizing vinylidene fluoride and a compound represented by formula (2) below; an insulating inorganic filler; and an organic solvent, the fluororesin film comprising 50 parts by mass or more of the insulating inorganic filler with respect to 100 parts by mass of the whole of the fluororesin film, 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2 , and R 3  are each independently hydrogen atoms, chlorine atoms, or alkyl groups having from 1 to 5 carbons; and X′″ is an atomic group having a molecular weight of 456 or less and having a main chain configured from 1 to 18 atoms. 
     
     
         2 . The separator resin film according to  claim 1 , wherein the insulating inorganic filler is at least any one of alumina and silicon dioxide. 
     
     
         3 . A non-aqueous electrolyte secondary battery comprising the separator resin film according to  claim 1 . 
     
     
         4 . A non-aqueous electrolyte secondary battery comprising the separator resin film according to  claim 2 .