Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method
Reexamination Certificate
2011-04-12
2011-04-12
Rhee, Jane (Department: 1726)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Include electrolyte chemically specified and method
C429S209000, C429S223000, C429S231950
Reexamination Certificate
active
07923147
ABSTRACT:
A layered lithium-nickel-based compound oxide powder for a positive electrode material for a high density lithium secondary cell, capable of providing a lithium secondary cell having a high capacity and excellent in the rate characteristics also, is provided.A layered lithium-nickel-based compound oxide powder for a positive electrode material for a lithium secondary cell, characterized in that the bulk density is at least 2.0 g/cc, the average primary particle size B is from 0.1 to 1 μm, the median diameter A of the secondary particles is from 9 to 20 μm, and the ratio A/B of the median diameter A of the secondary particles to the average primary particle size B, is within a range of from 10 to 200. In production of a layered lithium-nickel-based compound oxide powder, which comprises spray drying a slurry having a nickel compound and a transition metal element compound capable of substituting lithium other than nickel, dispersed in a liquid medium, followed by mixing with a lithium compound, and firing the mixture, the spray drying is carried out under conditions of 0.4≦G/S≦4 and G/S≦0.0012V, when the slurry viscosity at the time of the spray drying is represented by V (cp), the slurry supply amount is represented by S (g/min) and the gas supply amount is represented by G (L/min).
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Mitsubishi Chemical Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Rhee Jane
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