Separator for a non-aqueous secondary battery, and non-aqueous secondary battery
Provided is a separator for a non-aqueous secondary battery, including: a porous substrate having an average pore diameter of from 20 nm to 100 nm; and a porous layer provided on one or both sides of the porous substrate and including a polyvinylidene fluoride resin and a filler, the porous layer including a filler in an amount of from 45% by volume to 75% by volume with respect to a total solid content of the porous layer, a weight average molecular weight of the polyvinylidene fluoride resin being 1,000,000 or more, and a peel strength between the porous substrate and the porous layer being 0.20 N/12 mm or more.
1. A separator for a non-aqueous secondary battery, comprising:
a porous substrate having an average pore diameter of from 25 nm to 90 nm; and
a porous layer provided on one or both sides of the porous substrate and comprising a polyvinylidene fluoride resin and a filler,
the porous layer comprising a filler in an amount of from 53% by volume to 70% by volume with respect to a total solid content of the porous layer,
a weight average molecular weight of the polyvinylidene fluoride resin in the porous layer being 1,000,000 or more, and
a peel strength between the porous substrate and the porous layer being 0.3 N/12 mm or more.
2. The separator for a non-aqueous secondary battery according to claim 1 , wherein the weight average molecular weight of the polyvinylidene fluoride resin in the porous layer is 1,100,000 or more.
3. The separator for a non-aqueous secondary battery according to claim 1 , wherein a volume average particle diameter of the filler is from 0.1 μm to 2.0 μm.
4. The separator for a non-aqueous secondary battery according to claim 1 , wherein the filler is an inorganic filler.
5. The separator for a non-aqueous secondary battery according to claim 1 , wherein the polyvinylidene fluoride resin comprises a vinylidene fluoride-hexafluoropropylene copolymer.
6. The separator for a non-aqueous secondary battery according to claim 5 , wherein, in the vinylidene fluoride-hexafluoropropylene copolymer, a proportion of constituent units derived from hexafluoropropylene is from 2.0% by mass to 7.0% by mass.
7. The separator for a non-aqueous secondary battery according to claim 1 , wherein the porous substrate is a polyolefin microporous film.
8. The separator for a non-aqueous secondary battery according to claim 1 , wherein the porous layer is provided on both sides of the porous substrate.
9. A non-aqueous secondary battery comprising:
a positive electrode;
a negative electrode; and
the separator for a non-aqueous secondary battery according to claim 1 , which is disposed between the positive electrode and the negative electrode,
wherein, in the non-aqueous secondary battery, an electromotive force is obtained by lithium doping/de-doping.
10. A separator for a non-aqueous secondary battery, comprising:
a porous substrate having an average pore diameter of from 25 nm to 90 nm; and
a porous layer provided on one or both sides of the porous substrate and comprising a polyvinylidene fluoride resin and a filler,
the porous layer comprising a filler in an amount of from 53% by volume to 70% by volume with respect to a total solid content of the porous layer,
a weight average molecular weight of the polyvinylidene fluoride resin in the porous layer being 1,000,000 or more, and
a peel strength between the porous substrate and the porous layer being 0.3 N/12 mm or more,
wherein the porous substrate has a thickness of 10 μm to 25 μm.
11. The separator for a non-aqueous secondary battery according to claim 10 , wherein the porous substrate has a thickness of 11 μm to 25 μm.
12. The separator for a non-aqueous secondary battery according to claim 10 , wherein the porous substrate has a thickness of 12 μm to 25 μm.
13. The separator for a non-aqueous secondary battery according to claim 10 , wherein the weight average molecular weight of the polyvinylidene fluoride resin in the porous layer is 1,100,000 or more.
14. The separator for a non-aqueous secondary battery according to claim 10 , wherein a volume average particle diameter of the filler is from 0.1 μm to 2.0 μm.
15. The separator for a non-aqueous secondary battery according to claim 10 , wherein the filler is an inorganic filler.
16. The separator for a non-aqueous secondary battery according to claim 10 , wherein the polyvinylidene fluoride resin comprises a vinylidene fluoride-hexafluoropropylene copolymer.
17. The separator for a non-aqueous secondary battery according to claim 16 , wherein, in the vinylidene fluoride-hexafluoropropylene copolymer, a proportion of constituent units derived from hexafluoropropylene is from 2.0% by mass to 7.0% by mass.
18. The separator for a non-aqueous secondary battery according to claim 10 , wherein the porous substrate is a polyolefin microporous film.
19. The separator for a non-aqueous secondary battery according to claim 10 , wherein the porous layer is provided on both sides of the porous substrate.
20. A non-aqueous secondary battery comprising:
a positive electrode;
a negative electrode; and
the separator for a non-aqueous secondary battery according to claim 10 , which is disposed between the positive electrode and the negative electrode,
wherein, in the non-aqueous secondary battery, an electromotive force is obtained by lithium doping/de-doping.