CPC H01M 4/606 (2013.01) [H01M 4/366 (2013.01); H01M 10/0525 (2013.01); H01M 10/0585 (2013.01); H01M 50/411 (2021.01); H01M 50/443 (2021.01); H01M 50/489 (2021.01)] | 7 Claims |
1. A composition for a non-aqueous secondary battery functional layer, comprising a particulate polymer, wherein
the particulate polymer has a core-shell structure including a core portion and a shell portion covering at least a portion of an outer surface of the core portion,
the particulate polymer has a volume-average particle diameter of not less than 0.05 μm and not more than 1.5 μm,
the core portion is formed of a polymer A including an aromatic vinyl monomer unit, having a degree of swelling in electrolyte solution of 400 mass % or less, and having a glass-transition temperature of 25° C. or higher, and
the shell portion is formed of a polymer B including not less than 1 mol % and not more than 30 mol % of a sulfo group-containing monomer unit, wherein the sulfo group-containing monomer unit is a lithium styrene sulfonate unit.
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