US 12,334,549 B2
Positive electrode active material for lithium ion secondary battery and lithium ion secondary battery
Haruki Kaneda, Niihama (JP); and Yuki Koshika, Niihama (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 17/637,914
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Aug. 28, 2020, PCT No. PCT/JP2020/032774
§ 371(c)(1), (2) Date Feb. 24, 2022,
PCT Pub. No. WO2021/040031, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 2019-157719 (JP), filed on Aug. 30, 2019; and application No. 2019-157720 (JP), filed on Aug. 30, 2019.
Prior Publication US 2022/0285679 A1, Sep. 8, 2022
Int. Cl. H01M 4/505 (2010.01); C01G 53/42 (2025.01); C01G 53/44 (2025.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/505 (2013.01) [C01G 53/42 (2013.01); C01G 53/44 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2002/74 (2013.01); C01P 2002/76 (2013.01); C01P 2004/03 (2013.01); C01P 2004/50 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2006/12 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A positive electrode active material for a lithium ion secondary battery, the positive electrode active material comprising a lithium-nickel composite oxide having a hexagonal layered structure and configured by particles including at least either single primary particles or secondary particles with a plurality of aggregated primary particles,
wherein metal elements constituting the lithium-nickel composite oxide include lithium (Li), nickel (Ni), and optionally at least one element M (M) selected from the group consisting of Co, Mn, Al, V, Mg, Mo, Ca, Cr, Zr, Ti, Nb, Na, K, W, Fe, Zn, B, Si, P, and Ta,
a mole number ratio of the metal elements is represented as Li:Ni:M=a:b:c (provided that, 0.95≤a≤1.10, 0.30≤b≤1.00, 0.00≤c≤0.70, and b+c=1), and
the particles included in the positive electrode active material have a cross section having an area proportion of a crystal face having a maximum area to the cross section of 80% or more when one crystal face is defined as a region having a crystal misorientation of 15° or less with respect to an orientation of the cross section measured by Electron Backscatter Diffraction method.