US 11,728,481 B2
Method of producing positive electrode active material for nonaqueous electrolyte secondary battery
Kenichi Kobayashi, Tokushima (JP); and Yukiko Sano, Anan (JP)
Assigned to NICHIA CORPORATION, Anan (JP)
Filed by Nichia Corporation, Anan (JP)
Filed on Dec. 10, 2021, as Appl. No. 17/547,783.
Application 16/881,940 is a division of application No. 16/404,287, filed on May 6, 2019, granted, now 10,700,353, issued on Jun. 30, 2020.
Application 16/404,287 is a division of application No. 16/140,976, filed on Sep. 25, 2018, granted, now 10,326,132, issued on Jun. 18, 2019.
Application 16/140,976 is a division of application No. 15/473,974, filed on Mar. 30, 2017, granted, now 10,115,967, issued on Oct. 30, 2018.
Application 17/547,783 is a continuation of application No. 16/881,940, filed on May 22, 2020, granted, now 11,233,238.
Claims priority of application No. 2016-072487 (JP), filed on Mar. 31, 2016; and application No. 2017-059653 (JP), filed on Mar. 24, 2017.
Prior Publication US 2022/0102716 A1, Mar. 31, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/505 (2010.01); C01G 53/00 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01); H01M 4/485 (2010.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 10/052 (2010.01)
CPC H01M 4/505 (2013.01) [C01G 53/006 (2013.01); C01G 53/40 (2013.01); C01G 53/42 (2013.01); C01G 53/50 (2013.01); H01M 4/131 (2013.01); H01M 4/1391 (2013.01); H01M 4/485 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2004/03 (2013.01); C01P 2004/51 (2013.01); C01P 2004/61 (2013.01); C01P 2006/40 (2013.01); H01M 10/052 (2013.01)] 14 Claims
OG exemplary drawing
 
1. 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.