Polymer compound, intermediate composition, negative electrode, electrical storage device, slurry for negative electrode, method for producing polymer compound, and method for producing negative electrode

A polymer compound to be used as a binder for a negative electrode of a power storage device, wherein

• the polymer compound has a chain structure constituted by a polyacrylic acid, and a crosslinked structure connecting carboxyl groups in the chain structure or between the chain structures with each other,
• the crosslinked structure is at least one crosslinked structure selected from the following general formulae (2) to (4), and
• the chain structure has free carboxyl groups and carboxyl groups converted into a lithium salt
• where PAA denotes the chain structure constituted by the polyacrylic acid converted into a lithium salt;
• X is a structure represented by the following general formula (5):
• where
• Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group, or an oxygen atom, and
• R1 and R2 are each independently a hydrogen atom, a methyl group, a trifluoromethyl group, or a methoxy group.

An intermediate composition of a polymer compound to be used as a binder for a negative electrode of a power storage device, wherein

• the intermediate composition contains a polyacrylic acid having some of carboxyl groups converted into a lithium salt, a polyfunctional amine represented by the following general formula (1), and a mixed solvent of a nonaqueous solvent with water,
• the polyacrylic acid and the polyfunctional amine are dissolved in the mixed solvent:
• where
• Y is a straight-chain alkyl group having 1 to 4 carbon atoms, a phenylene group or an oxygen atom, and
• R1 and R2 are each independently one or more hydrogen atoms, a methyl group, an ethyl group, a trifluoromethyl group, or a methoxy group.