Binder composition for non-aqueous secondary battery electrode, slurry composition for non-aqueous secondary battery electrode, electrode for non-aqueous secondary battery, and non-aqueous secondary battery
A binder composition for a non-aqueous secondary battery electrode contains a particulate polymer A and a particulate polymer B. The particulate polymer A is a block copolymer including an aromatic vinyl monomer unit and an aliphatic conjugated diene monomer unit having a carbon number of 4 or more. The particulate polymer B is a random copolymer including a (meth)acrylic acid ester monomer unit in a proportion of not less than 20.0 mass % and not more than 80.0 mass %.
1. A binder composition for a non-aqueous secondary battery electrode comprising a particulate polymer A and a particulate polymer B, wherein
the particulate polymer A is a block copolymer including an aromatic vinyl monomer unit, in a proportion of not less than 10.0 mass % and not more than 30.0 mass %, and an aliphatic conjugated diene monomer unit having a carbon number of 4 or more,
the particulate polymer A includes a graft portion, and
the particulate polymer B is a random copolymer including a (meth)acrylic acid ester monomer unit in a proportion of not less than 20.0 mass % and not more than 77.5 mass % and an aromatic vinyl monomer unit.
2. The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein the graft portion of the particulate polymer A includes an acidic group-containing monomer unit in a proportion of not less than 0.1 mass % and not more than 30.0 mass % when the particulate polymer A is taken to be 100 mass % overall.
3. The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein content of the particulate polymer A is not less than 20.0 mass % and not more than 80.0 mass % when total content of the particulate polymer A and the particulate polymer B is taken to be 100 mass %.
4. The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein the proportion of the aromatic vinyl monomer unit in the particulate polymer B is not less than 10 mass % and not more than 70 mass %.
5. The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein the particulate polymer B further includes an acidic group-containing monomer unit in a proportion of not less than 1.0 mass % and not more than 15.0 mass %.
6. A slurry composition for a non-aqueous secondary battery electrode comprising: an electrode active material; and the binder composition for a non-aqueous secondary battery electrode according to claim 1 .
7. An electrode for a non-aqueous secondary battery comprising an electrode mixed material layer formed using the slurry composition for a non-aqueous secondary battery electrode according to claim 6 , wherein the electrode mixed material layer has a density of 1.70 g/cm3 or more.
8. A non-aqueous secondary battery comprising the electrode for a non-aqueous secondary battery according to claim 7 .