US 12,080,885 B2
Positive electrode active material for non-aqueous electrolyte secondary battery and production method thereof
Katsuyuki Kitano, Anan (JP); and Hayaki Matsumoto, Anan (JP)
Assigned to NICHIA CORPORATION, Anan (JP)
Filed by NICHIA CORPORATION, Anan (JP)
Filed on Oct. 14, 2022, as Appl. No. 18/046,905.
Application 18/046,905 is a continuation of application No. 17/102,646, filed on Nov. 24, 2020, granted, now 11,515,533.
Claims priority of application No. 2019-217181 (JP), filed on Nov. 29, 2019.
Prior Publication US 2023/0112283 A1, Apr. 13, 2023
Int. Cl. H01M 4/505 (2010.01); C01G 53/00 (2006.01); H01M 4/02 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/505 (2013.01) [C01G 53/50 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2004/03 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A positive electrode active material for a non-aqueous electrolyte secondary battery, the positive electrode active material comprising:
a lithium-transition metal composite oxide containing lithium, nickel, cobalt, and manganese, and having a layered structure,
wherein the lithium-transition metal composite oxide has a ratio D50/DSEM that is from 1 to 4, wherein D50 is a 50% particle diameter in a cumulative particle size distribution on a volumetric basis and DSEM is an average particle diameter based on electron microscope observation,
a disorder of elemental nickel that is 3% or less, and
the lithium-transition metal composite oxide has a composition with
a ratio of a number of moles of cobalt to the total number of moles of the metals other than lithium that is less than 0.2,
a ratio of a number of moles of manganese to the total number of moles of the metals other than lithium that is less than 0.2, and
a ratio of the number of moles of manganese to a sum of the number of moles of cobalt and the number of moles of manganese that is less than 0.4.