Binder composition for non-aqueous secondary battery heat-resistant layer, slurry composition for non-aqueous secondary battery heat-resistant layer, heat-resistant layer for non-aqueous secondary battery, and non-aqueous secondary battery
Provided is a binder composition for a non-aqueous secondary battery heat-resistant layer containing a particulate polymer that includes a cyano group-containing monomer unit and a hydroxyl group-containing monomer unit and for which a value (M OH /S) obtained by dividing a value M OH of a mole fraction of the hydroxyl group-containing monomer unit in the particulate polymer by a value S (μm 2 ) of surface area of the particulate polymer is 0.40 or more.
1. A binder composition for a non-aqueous secondary battery heat-resistant layer comprising a particulate polymer, wherein
the particulate polymer includes a cyano group-containing monomer unit, a hydroxyl group-containing monomer unit, and a (meth)acrylic acid ester monomer unit,
a value M OH /S obtained by dividing a value M OH of a mole fraction of the hydroxyl group-containing monomer unit in the particulate polymer by a value S of surface area of the particulate polymer in units of μm 2 is 0.40 or more and 1.51 or less,
a mole fraction of the (meth)acrylic acid ester monomer unit in the particulate polymer is more than 0.5, and
a mole fraction of the cyano group-containing monomer unit in the particulate polymer is 0.07 or less.
2. The binder composition for a non-aqueous secondary battery heat-resistant layer according to claim 1 , wherein
the particulate polymer has a volume-average particle diameter of 0.30 μm or less, and
the mole fraction of the hydroxyl group-containing monomer unit in the particulate polymer is 0.02 or more.
3. The binder composition for a non-aqueous secondary battery heat-resistant layer according to claim 1 , wherein the particulate polymer has a degree of swelling in electrolyte solution of a factor of 8.0 or less.
4. A slurry composition for a non-aqueous secondary battery heat-resistant layer comprising: non-conductive particles; and the binder composition for a non-aqueous secondary battery heat-resistant layer according to claim 1 .
5. The slurry composition for a non-aqueous secondary battery heat-resistant layer according to claim 4 , wherein the non-conductive particles have a volume-average particle diameter of 0.7 μm or less.
6. A heat-resistant layer for a non-aqueous secondary battery formed using the slurry composition for a non-aqueous secondary battery heat-resistant layer according to claim 4 .
7. A non-aqueous secondary battery comprising the heat-resistant layer for a non-aqueous secondary battery according to claim 6 .