US 12,261,293 B2
Positive electrode active material for lithium ion secondary battery and lithium ion secondary battery
Haruki Kaneda, Niihama (JP); Yuki Koshika, Niihama (JP); and Yuki Furuichi, Niihama (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 17/637,938
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Aug. 28, 2020, PCT No. PCT/JP2020/032776
§ 371(c)(1), (2) Date Feb. 24, 2022,
PCT Pub. No. WO2021/040033, 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 2022/0285676 A1, Sep. 8, 2022
Int. Cl. H01M 4/505 (2010.01); C01G 53/42 (2025.01); C01G 53/44 (2025.01); H01M 4/02 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01)
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 2002/50 (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); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 4 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 single primary particles or by single primary particles and secondary particles with a plurality of aggregated primary particles,
wherein a number proportion of the single primary particles to all of the single primary and secondary particles is 30% or more,
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 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), a ratio of a (003) diffraction peak intensity I(003) to a (104) diffraction peak intensity I(104) (I(003)/I(104)) is 2.0 or more, the (003) diffraction peak intensity and the (104) diffraction peak intensity determined from X-ray diffraction measured using a flat plate sample holder of a Bragg Brentano optical system using a Cu-kα ray as an X-ray source,
a degree of circularity is 0.93 or more and 1.00 or less, the degree of circularity determined with a flow image analysis method using a wet flow particle size/shape analyzer, and
the positive electrode active material has a specific surface area of 1.0 m2/g or more and 5.0 m2/g or less, and the specific surface area is determined with a nitrogen adsorption method.