Electrode mixture paste, electrode, and non-aqueous electrolyte rechargeable battery
The present invention provides an electrode mixture paste containing an electrode active material, a conductive material, a binder, and an organic solvent. The electrode active material has a sodium-containing transition metal compound, the binder has a polymer soluble to the organic solvent, and the polymer does not have a structural unit derived from vinylidene halide.
1. An electrode mixture paste comprising an electrode active material, a conductive material, a binder, and an organic solvent, wherein the electrode active material comprises a sodium-containing transition metal compound, the binder comprises a polymer soluble in the organic solvent, and the polymer has no structural unit derived from a vinylidene halide, wherein the polymer has the following structural unit (A) in the main chain and a glass transition temperature of −50° C. to 0° C., and includes an olefin polymer:
CHR 1 —CR 2 R 3 (A)
wherein R 1 and R 2 are each independently a hydrogen atom, a carboxyl group, or a divalent hydrocarbon group,
R 3 is a hydrogen atom, a hydroxyl group, a thiol group, an ester group, an aryl group, a nitrile group, an amino group, an amide group, a cyclic amide group, a carboxyl group, an ether group, a phosphate group, a sulfonate group, a carboxylic acid ester group, or an inorganic acid ester group, and
when the polymer has a plurality of structural units (A),
R 1 groups may be the same or different,
R 2 groups may be the same or different,
R 3 groups may be the same or different, and
R 1 , R 2 and R 3 may be the same or different, excluding the case where all of R 1 , R 2 and R 3 are hydrogen in structural unit (A), and
the sodium-containing transition metal compound is represented by the following formula (B):
Na x Mo 2 (B)
wherein M is one or more elements selected from the group consisting of Fe, Ni, Co, Mn, Cr, V, Ti, B, Al, Mg and Si, x is not less than 0.7 and not more than 1.2, and the sodium-containing transition metal compound has an O 3 type layered structure.
2. The electrode mixture paste according to claim 1 , wherein the amount of water contained in the electrode mixture paste is 30000 ppm or less.
3. An electrode produced by applying an electrode mixture paste as defined in claim 1 on a current collector.
4. A non-aqueous electrolyte secondary battery having the electrode as defined in claim 3 as a positive electrode.
5. The non-aqueous electrolyte secondary battery according to claim 4 further having a separator.