Method of producing positive electrode active material for nonaqueous electrolyte secondary battery
AssigneeNichia Corporation
InventorsKenichi KOBAYASHI, Yukiko SANO
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Abstract
A method of producing a positive electrode active material for a nonaqueous electrolyte secondary battery, the method includes preparing nickel-containing composite oxide particles having a ratio 1D90/1D10 of a 90% particle size 1D90 to a 10% particle size 1D10 in volume-based cumulative particle size distribution is 3 or less; mixing the composite oxide particles and a lithium compound to obtain a first mixture; subjecting the first mixture to a first heat treatment at a first temperature and a second heat treatment at a second temperature higher than the first temperature to obtain a first heat-treated product; and subjecting the first heat-treated material to a dispersion treatment.
Claims14
A method of producing a positive electrode active material for a nonaqueous electrolyte secondary battery, comprising:
- providing nickel-containing composite oxide particles;
- subjecting a first mixture containing the nickel-containing composite oxide particles and a lithium compound to a first heat treatment at a first temperature and a second heat treatment at a second temperature higher than the first temperature to obtain a first heat-treated material;
- and
- dissociating from the first heat-treated material the positive electrode active material,
- wherein the positive electrode active material comprises lithium-transition metal composite oxide particles having a ratio 2D50/2DSEM of a 50% particle size 2D50 in volume-based cumulative particle size distribution to an average particle size 2DSEM based on electron microscopic observation in a range of 1 to 4,
- wherein the lithium-transition metal composite oxide particles have a ratio 2D90/2D10 of a 90% particle size 2D90 to a 10% particle size 2D10 in volume-based cumulative particle size distribution is 4 or less, and
- wherein a molar ratio of nickel in a composition of the lithium-transition metal composite oxide to a total molar number of metals other than lithium is 0.3 to 0.6.
Dependencies are inferred from the claim text.