US 11,855,284 B2
Positive electrode active material precursor for non-aqueous electrolyte secondary battery
Kenji Tashiro, Ehime (JP); and Kentaro Sogabe, Ehime (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 16/766,392
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Nov. 27, 2018, PCT No. PCT/JP2018/043643
§ 371(c)(1), (2) Date May 22, 2020,
PCT Pub. No. WO2019/107373, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 2017-228253 (JP), filed on Nov. 28, 2017.
Prior Publication US 2020/0350578 A1, Nov. 5, 2020
Int. Cl. H01M 4/525 (2010.01); H01M 10/0525 (2010.01); C01G 53/00 (2006.01); H01M 4/02 (2006.01)
CPC H01M 4/525 (2013.01) [C01G 53/006 (2013.01); H01M 10/0525 (2013.01); C01P 2004/34 (2013.01); C01P 2004/61 (2013.01); C01P 2006/40 (2013.01); H01M 2004/028 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A positive electrode active material precursor for a non-aqueous electrolyte secondary battery, comprising:
nickel composite hydroxide particles, wherein
a cross section of each nickel composite hydroxide particle includes voids, and
when the cross section of an entirety of the nickel composite hydroxide particle is divided into a plurality of regions by boundary lines arranged in a grid such that each of the plurality of regions partitioned by the boundary lines has a size of 2 μm square,
an average value of a ratio of an area of the voids in an area of each of the plurality of regions of the entirety of the nickel composite hydroxide particle partitioned by the boundary lines, is greater than or equal to 0.5% and less than or equal to 5.0%, and
a standard deviation of the ratio of the area of the voids in the area of each of the plurality of regions of the entirety of the nickel composite hydroxide particle partitioned by the boundary lines, is less than or equal to 1.0.