| abstract |
The present invention provides a polyimide precursor solution that can obtain a polyimide film in which variation in film thickness is suppressed, a method for producing the polyimide film, and a method for producing a separator for a lithium ion secondary battery. The polyimide precursor solution contains: a polyimide precursor with a weight average molecular weight of 20,000 or more and 80,000 or less; particles; and an aqueous solvent, containing an organic amine compound (A) wherein the following water-soluble organic solvent ( Except B), containing selected from N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, N,N-dimethylformamide and N,N-dimethylacetamide At least one of the water-soluble organic solvent (B) and water (C) in the group consisting of, the content ratio of the (A), the (B) and the (C) [(A):( B): (C)] 0.02 or more and 0.07 or less: 0.02 or more and 0.05 or less: 0.88 or more and 0.96 or less in mass ratio. |