Composition for non-aqueous secondary battery functional layer, non-aqueous secondary battery functional layer, and non-aqueous secondary battery
Disclosed is a composition for non-aqueous secondary battery functional layer which comprises non-conductive particles; a water-soluble polymer having a degree of swelling in electrolyte solution of greater than 1.0 time and 2.0 times or less; and a water-insoluble polymer having a volume-average particle diameter of 0.01 μm or more and 0.30 μm or less.
1. A composition for non-aqueous secondary battery functional layer, comprising:
non-conductive particles;
a water-soluble polymer comprising 70% by mass or more and 99% by mass or less of a (meth)acrylamide monomer unit and having a degree of swelling in electrolyte solution of greater than 1.0 time and 2.0 times or less; and
a water-insoluble polymer having a volume-average particle diameter of 0.01 μm or more and 0.30 μm or less, wherein
the volume-average particle diameter of the water-insoluble polymer is 0.15 times or more and 0.60 times or less a volume-average particle diameter of the non-conductive particles.
2. The composition for non-aqueous secondary battery functional layer according to claim 1 , wherein the water-soluble polymer comprises 0.01% by mass or more and 2.0% by mass or less of a cross-linkable monomer unit.
3. The composition for non-aqueous secondary battery functional layer according to claim 1 , wherein the water-insoluble polymer has a degree of swelling in electrolyte solution of greater than 1.0 time and 3.0 times or less.
4. The composition for non-aqueous secondary battery functional layer according to claim 1 , wherein the composition comprises the water-insoluble polymer in an amount 0.1 times or more and 2.5 times or less the amount of the water-soluble polymer by mass.
5. A non-aqueous secondary battery functional layer formed using the composition for non-aqueous secondary battery functional layer according to claim 1 .
6. A non-aqueous secondary battery comprising the non-aqueous secondary battery functional layer according to claim 5 .