Electrode mixture, electrode, and nonaqueous electrolyte secondary cell
AssigneeSumitomo Chemical Company, Limited
InventorsJun-ichi Kageura, Takitaro Yamaguchi
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Abstract
The present invention provides an electrode mixture, an electrode and a nonaqueous electrolyte secondary battery. The electrode mixture includes a lithium mixed metal oxide represented by formula (1): Liz(Ni1-x-yMnxMy)O2 (1), an electrically conductive material, and a water-dispersible polymeric binder, wherein x is 0.30 or more and less than 1, y is 0 or more and less than 1, x+y is 0.30 or more and less than 1, z is 0.5 or more and 1.5 or less, and M represents one or more members selected from the group consisting of Co, Al, Ti, Mg and Fe.
Claims6
An electrode mixture comprising a lithium mixed metal oxide represented by formula (1):
- Liz(Ni1-x-yMnxMy)O2 (1)
- wherein x is 0.30 or more and less than 1,
- y is 0.01 or more and less than 0.3,
- x+y is 0.31 or more and less than 1,
- z is 0.5 or more and 1.5 or less, and
- M represents Co and/or Fe,
- an electrically conductive material, and a water-dispersible polymeric binder which contains an aqueous emulsion,
- wherein the aqueous emulsion contains one or more aqueous emulsions selected from the group consisting of vinyl polymer emulsions and acrylic polymer emulsions, and
- wherein a vinyl polymer in the vinyl polymer emulsions is at least one selected from the group consisting of ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-vinyl chloride copolymer, ethylene-vinyl chloride copolymer, and vinyl chloride-vinyl acetate copolymer, and
- an acrylic polymer in the acrylic emulsion is at least one selected from the group consisting of alkyl acrylate monopolymers, vinyl acetate-alkyl acrylate copolymer, vinyl chloride-alkyl acrylate copolymer, ethylene-vinyl acetate-alkyl acrylate copolymer, and methyl acrylate-ethyl acrylate copolymer,
- wherein an average particle size of the lithium mixed metal oxide is 0.1 to 0.3 μm and an average particle size of one or both of the vinyl polymer and the acrylic polymer in the aqueous emulsion is 0.001 to 0.9 μm, and
- wherein a BET specific surface area of the lithium mixed metal oxide is from 8.0 to 20 m2/g.
An electrode mixture comprising a lithium mixed metal oxide represented by formula (1):
- Liz(Ni1-x-yMnxMy)O2 (1)
- wherein x is 0.30 or more and less than 1,
- y is 0.01 or more and less than 0.3,
- x+y is 0.31 or more and less than 1,
- z is 0.5 or more and 1.5 or less, and
- M represents Co and/or Fe,
- an electrically conductive material, and a water-dispersible polymeric binder which contains an aqueous emulsion,
- wherein the aqueous emulsion contains one or more aqueous emulsions selected from the group consisting of vinyl polymer emulsions and acrylic polymer emulsions, and
- wherein a vinyl polymer in the vinyl polymer emulsions is at least one selected from the group consisting of ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-vinyl chloride copolymer, ethylene-vinyl chloride copolymer, and vinyl chloride-vinyl acetate copolymer, and
- an acrylic polymer in the acrylic emulsion is at least one selected from the group consisting of alkyl acrylate monopolymers, vinyl acetate-alkyl acrylate copolymer, vinyl chloride-alkyl acrylate copolymer, ethylene-vinyl acetate-alkyl acrylate copolymer, and methyl acrylate-ethylacrylate copolymer,
- wherein the lithium mixed metal oxide is 0.1 to 0.3 μm of the average particle size,
- wherein the concentration of the lithium mixed metal oxide, the electrically conductive material and the polymeric binder in the electrode mixture is 30 to 90% by weight, and
- wherein a BET specific surface area of the lithium mixed metal oxide is from 8.0 to 20 m2/g.
Dependencies are inferred from the claim text.