Polyimide precursor solution, porous polyimide film, separator for secondary battery, and secondary battery
A polyimide precursor solution includes a polyimide precursor having a glass transition temperature Tg of equal to or higher than 300° C. after imidization, an aqueous solvent containing water, an organic amine compound, and resin particles having a volume average particle size of equal to or less than 100 nm.
1. A polyimide precursor solution comprising:
a polyimide precursor having a glass transition temperature Tg of equal to or higher than 300° C. after imidization;
an aqueous solvent containing water;
an organic amine compound; and
resin particles having a volume average particle size of 40 nm or more and 95 nm or less.
2. The polyimide precursor solution according to claim 1 ,
wherein the polyimide precursor is a polymer of an aromatic tetracarboxylic dianhydride and an aromatic diamine compound.
3. The polyimide precursor solution according to claim 2 ,
wherein the aromatic tetracarboxylic dianhydride contains equal to or more than 80 mol % of biphenyltetracarboxylic dianhydride, and
the aromatic diamine compound contains equal to or more than 80 mol % of p-phenylenediamine.
4. The polyimide precursor solution according to claim 1 ,
wherein a weight average molecular weight of the resin particles is equal to or more than 200,000.
5. The polyimide precursor solution according to claim 2 ,
wherein the weight average molecular weight of the resin particles is equal to or more than 200,000.
6. The polyimide precursor solution according to claim 3 ,
wherein the weight average molecular weight of the resin particles is equal to or more than 200,000.
7. The polyimide precursor solution according to claim 4 ,
wherein the weight average molecular weight of the resin particles is equal to or more than 300,000.
8. The polyimide precursor solution according to claim 5 ,
wherein the weight average molecular weight of the resin particles is equal to or more than 300,000.
9. The polyimide precursor solution according to claim 6 ,
wherein the weight average molecular weight of the resin particles is equal to or more than 300,000.
10. The polyimide precursor solution according to claim 1 ,
wherein each of the resin particles has a carboxy group on a surface of the resin particle.
11. The polyimide precursor solution according to claim 2 , further comprising:
a carboxy group on a surface of the resin particle.
12. The polyimide precursor solution according to claim 3 , further comprising:
a carboxy group on a surface of the resin particle.
13. The polyimide precursor solution according to claim 4 , further comprising:
a carboxy group on a surface of the resin particle.
14. The polyimide precursor solution according to claim 5 , further comprising:
a carboxy group on a surface of the resin particle.
15. The polyimide precursor solution according to claim 6 , further comprising:
a carboxy group on a surface of the resin particle.
16. The polyimide precursor solution according to claim 7 , further comprising:
a carboxy group on a surface of the resin particle.
17. The polyimide precursor solution according to claim 8 , further comprising:
a carboxy group on a surface of the resin particle.