JP2011238416A5 - - Google Patents

Claims (12)

General formula: Li _w Ni _x Co _y Mn _z O ₂ (where 0.95 ≦ w ≦ 1.05, x = z, x + y + z = 1, 0.3 ≦ x ≦ 0.45, 0.1 ≦ y ≦ 0.4, 0.3 ≦ z ≦ 0.45), and a method for producing a hexagonal lithium nickel cobalt manganese composite oxide having a layered structure,
Nickel compounds, cobalt compounds, and manganese compounds are pulverized and mixed in a solvent until the average particle size exceeds 0.1 μm and falls within the range of 1 μm or less, and the resulting compound slurry is spray-dried to obtain an average. Obtaining a mixed raw material of a nickel compound, a cobalt compound, and a manganese compound having a particle size in the range of 2 μm to 6 μm;
Mixing the obtained mixed raw material and a lithium compound, firing the obtained mixture, and obtaining a lithium nickel cobalt manganese composite oxide;
Washing the obtained lithium nickel cobalt manganese composite oxide with water and vacuum drying;
A method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery.   The non-aqueous electrolyte secondary battery according to claim 1, further comprising a step of heat-treating the mixed raw material at 300 ° C. to 800 ° C., wherein the mixed raw material after the heat treatment and the lithium compound are mixed. A method for producing a positive electrode active material. General formula: Li _w Ni _x Co _y Mn _z O ₂ (where 0.95 ≦ w ≦ 1.05, x = z, x + y + z = 1, 0.3 ≦ x ≦ 0.45, 0.1 ≦ y ≦ 0.4, 0.3 ≦ z ≦ 0.45), and a method for producing a hexagonal lithium nickel cobalt manganese composite oxide having a layered structure,
Nickel compounds, cobalt compounds, manganese compounds, and lithium compounds are pulverized and mixed in a solvent until the average particle size exceeds 0.1 μm and falls within the range of 1 μm or less, and the resulting compound slurry is spray dried. And obtaining a mixture of a nickel compound, a cobalt compound, a manganese compound, and a lithium compound having an average particle size in the range of 2 μm to 6 μm;
Firing the obtained mixture to obtain a lithium nickel cobalt manganese composite oxide;
And a step of washing the obtained lithium nickel cobalt manganese composite oxide with water and vacuum drying. A method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery.   In the water washing step, after the obtained lithium nickel cobalt manganese composite oxide is mixed with water so that the slurry concentration is in the range of 500 g / L to 2000 g / L, the mixture is stirred for 15 minutes to 1 hour, Then, it filters, The manufacturing method of the positive electrode active material for nonaqueous electrolyte secondary batteries as described in any one of Claims 1-3 characterized by the above-mentioned.   The nickel compound, cobalt compound, and manganese compound are each one or more selected from the group consisting of oxides, hydroxides, oxyhydroxides, carbonates, and acetates. The manufacturing method of the positive electrode active material for nonaqueous electrolyte secondary batteries as described in any one of -4.   The said lithium compound is 1 or more types chosen from a hydroxide and carbonate, The manufacture of the positive electrode active material for nonaqueous electrolyte secondary batteries as described in any one of Claims 1-5 characterized by the above-mentioned. Method.   The firing process of the mixture is performed at a temperature in a range of 900 ° C to 1100 ° C, in an air stream or in an oxygen stream, and for one hour or longer. The manufacturing method of the positive electrode active material for nonaqueous electrolyte secondary batteries as described in any one of.   General formula: Li _w Ni _x Co _y Mn _z O ₂ (However, 0.95 ≦ w ≦ 1.30, x = z, x + y + z = 1, 0.3 ≦ x ≦ 0.45, 0.1 ≦ y ≦ 0.4, 0.3 ≦ z ≦ 0.45 ) And a hexagonal lithium nickel cobalt manganese composite oxide having a layered structure, and the site occupancy of metal ions other than lithium at the 3a site obtained by Rietveld analysis of the powder X-ray diffraction pattern is The non-aqueous electrolyte 2 is characterized in that it is 5% or less, the site occupancy of metal ions other than nickel, cobalt, and manganese at the 3b site is 10% or less, and the average particle size is 2 μm to 6 μm. Positive electrode active material for secondary battery.   9. The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 8, obtained by washing the lithium nickel cobalt manganese composite oxide with water and vacuum drying. Characterized Rukoto obtained by the production method according to any of claims 1 to 7, the positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 8. When used as a positive electrode material in 2032 type coin battery of the positive electrode, the initial discharge capacity of the battery becomes 180 mAh / g or more, and wherein the positive electrode resistance is less 6.5Omu, claims 8 to 10 The positive electrode active material for nonaqueous electrolyte secondary batteries in any one of. A non-aqueous electrolyte secondary battery comprising a positive electrode using the positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 8 as a positive electrode material.