Patent ID: 11929501
Assignee: NICHIA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC H

Claim 0:
1. A method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery, comprising:
providing a composition containing a first lithium transition metal composite oxide having a 50% particle size 1D50 in a first volume cumulative particle size distribution of 0.1 μm or more and less than 3.2 μm and a first liquid medium; and
granulating the composition to obtain a second lithium transition metal composite oxide having a 50% particle size 2D50 in a second volume cumulative particle size distribution greater than 1D50, wherein
the second lithium transition metal composite oxide has different volume cumulative particle size distributions before and after an ultrasonic treatment in a second liquid medium,
the second lithium transition metal composite oxide has a ratio of a 90% particle size 3D90 in a third volume cumulative particle size distribution measured after the ultrasonic treatment to a 90% particle size 2D90 in the second volume cumulative particle size distribution measured before the ultrasonic treatment (3D90/2D90) of 0.53 or less, and
the second lithium transition metal composite oxide is not subjected to a heat treatment in which heat of 300° C. or higher applies to the second lithium transition metal composite oxide.