Electrode structural body and production method thereof
In an electrode structural body, a coated film is obtained by applying an electrode mixture including an electrode active material, a first fluorine based polymer, and a solvent and drying the mixture, then formed on the surface of a current collector, the first fluorine based polymer has one or more side chains represented by the following Formula (1), and the coated film is subjected to heat treatment. —X—COOH (1) (In Formula (1), X is an atomic group having a molecular weight of less than 500, the main chain of which is made up of 1 to 20 atoms).
1. An electrode structural body, comprising a coated film formed on a surface of a current collector, wherein the coated film is obtained by applying an electrode mixture including an electrode active material, a first fluorine based polymer, a second fluorine based polymer having one or more side chains having a hydroxy group, and a solvent onto the surface of the current collector, drying the mixture, and subjecting to heat treatment,
wherein the first fluorine based polymer having one or more side chains represented by Formula (1),
—X—COOH (1),
where X is an atomic group having a molecular weight of less than 500, a main chain of which is made up of 1 to 20 atoms.
2. The electrode structural body according to claim 1 , wherein the solvent is a nonaqueous solvent.
3. The electrode structural body according to claim 1 , wherein the electrode active material has a specific surface area of 0.5 m 2 /g or greater.
4. The electrode structural body according to claim 1 , wherein the one or more side chains having a hydroxy group comprise side chains represented by formula (4),
—Y—OH (4),
wherein Y is —COO—Y′—or —Y′—, Y′ being a hydrocarbon having 1 to 8 carbons, or represented by (—CH 2 —CH 2 —O—) m (—CH 2 —CH(CH 3 )—O—) n , wherein both m and n are integers including 0, and (m+n)≤10.
5. The electrode structural body according to claim 1 , wherein the side chains represented by Formula (1) are side chains represented by Formula (2):
—COO—X′—COOH (2),
where X′ is an atomic group having a molecular weight of less than 456, the main chain of which is made up of 1 to 18 atoms.
6. The electrode structural body according to claim 1 , wherein the first fluorine based polymer is a fluorine based copolymer obtained by copolymerizing fluorine based monomers with at least one selected from 2-carboxyethyl acrylate, acryloyloxyethyl succinate, and acryloyloxypropyl succinate.
7. The electrode structural body according to claim 1 , wherein the second fluorine based polymer is a fluorine based copolymer obtained by copolymerizing fluorine based monomers with 2-hydroxyethyl acrylate and/or hydroxypropyl acrylate.
8. The electrode structural body according to claim 1 , wherein the current collector is an aluminum foil.
9. A battery comprising an electrode structural body according to claim 1 .
10. A method for producing an electrode structural body, comprising:
a step of applying an electrode mixture including an electrode active material, a first fluorine based polymer, a second fluorine based polymer having one or more side chains having a hydroxy group, and a nonaqueous solvent onto the surface of a current collector and drying the mixture, to form a coated film on the surface of the current collector; and
a step of subjecting the coated film after drying to heat treatment, wherein the first fluorine based polymer has one or more side chains represented by Formula (1):
—X—COOH (1),
where X is an atomic group having a molecular weight of less than 500, the main chain of which is made up of 1 to 20 atoms.