Nonaqueous secondary battery functional layer composition, nonaqueous secondary battery functional layer, and nonaqueous secondary battery
A composition for a non-aqueous secondary battery functional layer including a particulate polymer, wherein the particulate polymer is a copolymer containing 20% by weight or more and 80% by weight or less of an aromatic monovinyl monomer unit; and 0.01% by weight or more and 2% by weight or less of a polyvalent ethylenically unsaturated crosslinkable monomer unit, a volume-average particle diameter D of the particulate polymer is 0.5 μm or more and 5 μm or less, and a swelling degree of the particulate polymer to an electrolyte solution is more than 1 time and 3 times or less; and a non-aqueous secondary battery including the same.
1. A composition for a non-aqueous secondary battery functional layer comprising a particulate polymer, wherein
the particulate polymer is a copolymer containing
20% by weight or more and 80% by weight or less of an aromatic monovinyl monomer unit; and
0.01% by weight or more and 2% by weight or less of a polyvalent ethylenically unsaturated crosslinkable monomer unit,
a volume-average particle diameter D of the particulate polymer is 0.5 μm or more and 5 μm or less,
a swelling degree of the particulate polymer to an electrolyte solution is more than 1 time and 3 times or less, and
the particulate polymer has only one glass transition temperature and the only one glass transition temperature of the particulate polymer is 20° C. or higher.
2. The composition for the non-aqueous secondary battery functional layer according to claim 1 , wherein an elution amount of the particulate polymer to the electrolyte solution is 0.01% by weight or more and 10% by weight or less.
3. The composition for the non-aqueous secondary battery functional layer according to claim 1 , further comprising inorganic particles.
4. A functional layer for a non-aqueous secondary battery formed using the composition for the non-aqueous secondary battery functional layer according to claim 1 .
5. A non-aqueous secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte, wherein one or more of the positive electrode, the negative electrode, and the separator have the functional layer for the non-aqueous secondary battery according to claim 4 .
6. A functional layer for the non-aqueous secondary battery comprising
a particulate polymer, wherein the particulate polymer is a copolymer containing
20% by weight or more and 80% by weight or less of an aromatic monovinyl monomer unit; and
0.01% by weight or more and 2% by weight or less of a polyvalent ethylenically unsaturated crosslinkable monomer unit,
a volume-average particle diameter of the particulate polymer is 0.5 μm or more and 5 μm or less,
a swelling degree of the particulate polymer to a specific electrolyte solution is more than 1 time and 3 times or less, and
the particulate polymer has only one glass transition temperature and the only one glass transition temperature of the particulate polymer is 20° C. or higher.
7. The composition for the non-aqueous secondary battery functional layer according to claim 1 , wherein the particulate polymer further contains 5% by weight or more and 20% by weight or less of a (meth)acrylic acid alkyl ester monomer unit.
8. The functional layer for the non-aqueous secondary battery according to claim 6 , wherein the particulate polymer further contains 5% by weight or more and 20% by weight or less of a (meth)acrylic acid alkyl ester monomer unit.