Patent ID: 9685654
Date: 2017-06-20
CPC Classifications: H01M,Y02E

Claim:
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.