Binder composition for all-solid-state secondary battery, slurry composition for all-solid-state secondary battery electrode mixed material layer, slurry composition for all-solid-state secondary battery solid electrolyte layer, electrode for all-solid-state secondary battery, solid electrolyte layer for all-solid-state secondary battery, and all-solid-state secondary battery
Provided is a binder composition for an all-solid-state secondary battery with which it is possible to produce a slurry composition for a solid electrolyte-containing layer having good leveling performance and to form a solid electrolyte-containing layer that can cause an all-solid-state secondary battery to display excellent output characteristics. The binder composition for an all-solid-state secondary battery contains a first polymer, a second polymer, and a solvent. The first polymer is poorly soluble in the solvent. The second polymer includes a nitrile group-containing monomer unit and is highly soluble in the solvent.
1 . A binder composition for an all-solid-state secondary battery comprising a first polymer, a second polymer, and a solvent, wherein
the first polymer is a copolymer that is poorly soluble in the solvent and includes an ethylenically unsaturated carboxylic acid ester monomer unit and a cross-linkable monomer unit, and
the second polymer is a copolymer that is highly soluble in the solvent, the copolymer that is highly soluble in the solvent being a polymer that includes a nitrile group-containing monomer unit and an ethylenically unsaturated carboxylic acid ester monomer unit but does not include an aliphatic conjugated diene monomer unit and a hydrogenated product thereof.
2 . The binder composition for an all-solid-state secondary battery according to claim 1 , wherein the first polymer constitutes a proportion of not less than 10 mass % and not more than 90 mass % among a total of the first polymer and the second polymer.
3 . The binder composition for an all-solid-state secondary battery according to claim 1 , wherein the solvent includes either or both of xylene and butyl butyrate.
4 . A slurry composition for an all-solid-state secondary battery electrode mixed material layer comprising: a solid electrolyte; an electrode active material; and the binder composition for an all-solid-state secondary battery according to claim 1 .
5 . A slurry composition for an all-solid-state secondary battery solid electrolyte layer comprising: a solid electrolyte; and the binder composition for an all-solid-state secondary battery according to claim 1 .
6 . An electrode for an all-solid-state secondary battery comprising an electrode mixed material layer formed using the slurry composition for an all-solid-state secondary battery electrode mixed material layer according to claim 4 .
7 . A solid electrolyte layer for an all-solid-state secondary battery formed using the slurry composition for an all-solid-state secondary battery solid electrolyte layer according to claim 5 .
8 . An all-solid-state secondary battery comprising the electrode for an all-solid-state secondary battery according to claim 6 .
9 . An all-solid-state secondary battery comprising the solid electrolyte layer for an all-solid-state secondary battery according to claim 7 .
10 . A binder composition for an all-solid-state secondary battery comprising a first polymer, a second polymer, and a solvent, wherein
the first polymer is a copolymer that is poorly soluble in the solvent and includes an ethylenically unsaturated carboxylic acid ester monomer unit and a cross-linkable monomer unit, and a proportional content of the cross-linkable monomer unit is in a range of 0.01 mass % or more and 5 mass % or less, and
the second polymer is a copolymer that is highly soluble in the solvent, the copolymer that is highly soluble in the solvent being a polymer that includes a nitrile group-containing monomer unit and an ethylenically unsaturated carboxylic acid ester monomer unit but does not include an aliphatic conjugated diene monomer unit and a hydrogenated product thereof.