Binder for secondary battery, binder resin composition for secondary battery, electrode for secondary battery, and secondary battery
The present application relates to a binder for a secondary battery. The binder includes a first copolymer unit including a carboxyl group-containing acrylic monomer and at least one of an acrylic acid derivative monomer and a substituted or unsubstituted styrene and a second copolymer unit including a residue of a polymer azo initiator. A mass ratio of the second copolymer unit relative to a total mass of the first copolymer unit and the second copolymer unit is 10 mass % to 40 mass %.
1. A binder for a secondary battery, comprising:
a first copolymer unit comprising a carboxyl group-containing acrylic monomer and at least one of an acrylic acid derivative monomer and a substituted or unsubstituted styrene; and
a second copolymer unit comprising a residue of a polymer azo initiator,
wherein a mass ratio of the second copolymer unit relative to a total mass of the first copolymer unit and the second copolymer unit is 10 mass % to 40 mass %,
wherein at least one part of the carboxyl group-containing acrylic monomer is an alkali metal salt or an ammonium salt.
2. The binder of claim 1 , wherein the carboxyl group-containing acrylic monomer is at least one selected from acrylic acid, methacrylic acid, maleic acid, monomethyl maleic acid, 2-carboxylethyl acrylate, and 2-carboxylethyl methacrylate.
3. The binder of claim 1 , wherein the acrylic acid derivative monomer is at least one selected from a nitrile group-containing acrylic monomer, acrylic acid ester, and acrylamide.
4. The binder of claim 3 , wherein the nitrile group-containing acrylic monomer is at least one selected from acrylonitrile, methacrylonitrile, 2-cyanoethylacrylate, and 2-cyanoethylmethacrylate.
5. The binder of claim 1 , wherein the first copolymer unit comprises a nitrile group-containing acrylic monomer as the acrylic acid derivative monomer.
6. The binder of claim 1 , wherein the second copolymer unit comprises at least one of polyether and polysiloxane as the residue of the polymer azo initiator.
7. A binder resin composition for a secondary battery comprising the binder of claim 1 .
8. An electrode for a secondary battery comprising the binder of claim 1 .
9. The electrode of claim 8 , further comprising carboxylmethyl cellulose (CMC) as the binder for the secondary battery.
10. A secondary battery comprising the electrode of claim 8 .
11. The secondary battery of claim 10 , wherein the electrode is a negative electrode.