Method for producing electrode
An electrode is produced by forming an electrode layer on a surface of a current collector using an electrode composition containing a binder including a polyamide acid that is obtained from a specific aromatic tetracarboxylic acid compound and a diamine component containing a diamine having a carboxyl group, and subsequently performing heat treatment to remove a solvent and perform an imidization reaction of the polyamide acid. It is preferable that the electrode composition further contains a crosslinking agent having an epoxy group or an oxazoline group. It is also preferable that the electrode composition further contains a pyridine.
1. A method for producing an electrode, the method comprising forming an electrode layer on a surface of a current collector using an electrode composition containing at least an electrode active material and a binder comprising a polyamide acid having a repeating unit represented by a formula (1) below, and subsequently performing heat treatment to remove a solvent and perform an imidization reaction of the polyamide acid,
wherein in the formula (1), A comprises at least one tetravalent group selected from the group consisting of tetravalent groups represented by formulae (2), (3), and (4) below, and
B comprises at least one divalent group selected from the group consisting of: divalent groups represented by formulae (5), (6), (7), and (8) below and divalent saturated hydrocarbon groups having 4 to 10 carbon atoms; and at least one divalent group selected from the group consisting of divalent groups represented by formulae (9) and (10) below,
wherein in the formula (8), X is any of a direct bond, an oxygen atom, a sulfur atom, a methylene group, a carbonyl group, a sulfoxyl group, a sulfone group, a 1,1′-ethylidene group, a 1,2-ethylidene group, a 2,2′-isopropylidene group, a 2,2′-hexafluoroisopropylidene group, a cyclohexylidene group, a phenylene group, a 1,3-phenylenedimethylene group, a 1,4-phenylenedimethylene group, a 1,3-phenylenediethylidene group, a 1,4-phenylenediethylidene group, a 1,3-phenylenedipropylidene group, a 1,4-phenylenedipropylidene group, a 1,3-phenylenedioxy group, a 1,4-phenylenedioxy group, a biphenylenedioxy group, a methylenediphenoxy group, an ethylidenediphenoxy group, a propylidenediphenoxy group, a hexafluoropropylidenediphenoxy group, an oxydiphenoxy group, a thiodiphenoxy group, and a sulfonediphenoxy group, and
wherein in the formula (10), Y is any of a direct bond, an oxygen atom, a sulfur atom, a methylene group, a carbonyl group, a sulfoxyl group, a sulfone group, a 1,1′-ethylidene group, a 1,2-ethylidene group, a 2,2′-isopropylidene group, a 2,2′-hexafluoroisopropylidene group, a cyclohexylidene group, a phenylene group, a 1,3-phenylenedimethylene group, a 1,4-phenylenedimethylene group, a 1,3-phenylenediethylidene group, a 1,4-phenylenediethylidene group, a 1,3-phenylenedipropylidene group, a 1,4-phenylenedipropylidene group, a 1,3-phenylenedioxy group, a 1,4-phenylenedioxy group, a biphenylenedioxy group, a methylenediphenoxy group, an ethylidenediphenoxy group, a propylidenediphenoxy group, a hexafluoropropylidenediphenoxy group, an oxydiphenoxy group, a thiodiphenoxy group, and a sulfonediphenoxy group.
2. The method for producing an electrode according to claim 1 , wherein the electrode composition further contains a crosslinking agent having an epoxy group or an oxazoline group.
3. The method for producing an electrode according to claim 1 , wherein the electrode composition further contains a pyridine compound.
4. The method for producing an electrode according to claim 1 , wherein the electrode active material is carbon powder, silicon powder, tin powder, or alloy powder containing silicon or tin.
5. The method for producing an electrode according to claim 1 , wherein the electrode active material is a lithium transition metal oxide.
6. The method for producing an electrode according to claim 1 , wherein an electrode for a lithium ion secondary battery is obtained.
7. The method for producing an electrode according to claim 2 , wherein the electrode composition further contains a pyridine compound.
8. The method for producing an electrode according to claim 2 , wherein the electrode active material is carbon powder, silicon powder, tin powder, or alloy powder containing silicon or tin.
9. The method for producing an electrode according to claim 3 , wherein the electrode active material is carbon powder, silicon powder, tin powder, or alloy powder containing silicon or tin.
10. The method for producing an electrode according to claim 2 , wherein the electrode active material is a lithium transition metal oxide.
11. The method for producing an electrode according to claim 3 , wherein the electrode active material is a lithium transition metal oxide.
12. The method for producing an electrode according to claim 4 , wherein the electrode active material is a lithium transition metal oxide.
13. The method for producing an electrode according to claim 2 , wherein an electrode for a lithium ion secondary battery is obtained.
14. The method for producing an electrode according to claim 3 , wherein an electrode for a lithium ion secondary battery is obtained.
15. The method for producing an electrode according to claim 4 , wherein an electrode for a lithium ion secondary battery is obtained.
16. The method for producing an electrode according to claim 5 , wherein an electrode for a lithium ion secondary battery is obtained.
17. The method for producing an electrode according to claim 7 , wherein the electrode active material is carbon powder, silicon powder, tin powder, or alloy powder containing silicon or tin.
18. The method for producing an electrode according to claim 7 , wherein the electrode active material is a lithium transition metal oxide.
19. The method for producing an electrode according to claim 8 , wherein the electrode active material is a lithium transition metal oxide.
20. The method for producing an electrode according to claim 9 , wherein the electrode active material is a lithium transition metal oxide.