US 12,266,794 B2
Positive electrode active material and method of producing positive electrode active material
Ryuhei Hattori, Tokushima (JP); Yoshitomo Miyashita, Tokushima (JP); Tatsuya Yokoyama, Anan (JP); Chika Nishio, Anan (JP); and Takashi Sugimoto, Tokushima (JP)
Assigned to NICHIA CORPORATION, Anan (JP)
Filed by NICHIA CORPORATION, Anan (JP)
Filed on Jan. 19, 2024, as Appl. No. 18/417,513.
Application 18/417,513 is a continuation of application No. 18/170,373, filed on Feb. 16, 2023, granted, now 11,942,631.
Application 18/170,373 is a continuation of application No. 16/926,613, filed on Jul. 10, 2020, granted, now 11,621,415, issued on Apr. 4, 2023.
Claims priority of application No. 2019-129204 (JP), filed on Jul. 11, 2019; and application No. 2020-097755 (JP), filed on Jun. 4, 2020.
Prior Publication US 2024/0154107 A1, May 9, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/485 (2010.01); C01G 53/00 (2006.01); C01G 53/40 (2025.01); C01G 53/42 (2025.01); H01M 4/02 (2006.01); H01M 4/131 (2010.01); H01M 4/1391 (2010.01)
CPC H01M 4/485 (2013.01) [C01G 53/40 (2013.01); C01G 53/42 (2013.01); H01M 4/131 (2013.01); H01M 4/1391 (2013.01); C01P 2002/52 (2013.01); H01M 2004/028 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A positive electrode active material, comprising:
secondary particles each composed of an aggregate of primary particles that contain a lithium transition metal composite oxide having a layered structure and a composition ratio of a number of moles of nickel to a total number of moles of metals other than lithium of from 0.7 to less than 1,
wherein a compound containing boron is attached on at least a part of surfaces of the primary particles,
a compound containing sodium is present in at least a part of particle boundaries of the secondary particles,
a sodium element content is in a range of from 150 ppm to 1300 ppm and
a ratio of a number of moles of boron element relative to the total number of moles of metals other than lithium in the lithium transition metal composite oxide is in a range of from 0.1% by mole to 2% by mole.