US 12,451,483 B2
Metal composite hydroxide and method for producing same, positive electrode active material for non-aqueous electrolyte secondary battery and method for producing same, and non-aqueous electrolyte secondary battery
Takahiro Toma, Niihama (JP); Haruki Kaneda, Niihama (JP); and Yuki Koshika, Niihama (JP)
Assigned to SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
Appl. No. 16/975,353
Filed by SUMITOMO METAL MINING CO., LTD., Tokyo (JP)
PCT Filed Feb. 20, 2019, PCT No. PCT/JP2019/006394
§ 371(c)(1), (2) Date Aug. 24, 2020,
PCT Pub. No. WO2019/163847, PCT Pub. Date Aug. 29, 2019.
Claims priority of application No. 2018-029557 (JP), filed on Feb. 22, 2018.
Prior Publication US 2020/0411858 A1, Dec. 31, 2020
Int. Cl. H01M 4/525 (2010.01); H01M 4/02 (2006.01); H01M 4/04 (2006.01); H01M 4/131 (2010.01); H01M 4/134 (2010.01); H01M 4/1391 (2010.01); H01M 4/1395 (2010.01); H01M 4/36 (2006.01); H01M 4/505 (2010.01); H01M 10/0525 (2010.01)
CPC H01M 4/525 (2013.01) [H01M 4/0471 (2013.01); H01M 4/131 (2013.01); H01M 4/134 (2013.01); H01M 4/1391 (2013.01); H01M 4/1395 (2013.01); H01M 4/364 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); H01M 2004/027 (2013.01); H01M 2004/028 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A metal composite hydroxide represented by a general formula (1): Ni1−x−yCoxMnyMz(OH)2+α (where 0.02≤x≤0.3, 0.02≤y≤0.3, 0≤z≤0.05, and −0.5≤α≤0.5 are satisfied and M is at least one element selected from the group consisting of Mg, Ca, Al, Si, Fe, Cr, V, Mo, W, Nb, Ti, and Zr), wherein
[(D90−D10)/MV] that indicates a dispersion of a particle size in particle size distribution calculated by D90, D10 and a volume average particle diameter (MV) by a laser diffraction scattering method is less than 0.80,
the metal composite hydroxide comprises a first particle having a core portion inside the particle and a shell portion formed around the core portion,
a composition of the core portion is represented by a general formula (2): Ni1-x1-y1Cox1Mny1Mz1(OH)2+α1 (where 0.4<(1−x1−y1)≤0.96, 0≤z1≤0.05, and −0.5≤α1≤0.5 are satisfied),
a composition of the shell portion is represented by a general formula (3): Ni1-x2-y2Cox2Mny2Mz2(OH)2+α2 (where (1−x1−y1)/(1−x2−y2)>1.0, 0<(1−x2−y2)<0.6, 0≤z2≤0.05, and −0.5≤α2≤0.5 are satisfied),
the shell portion has a thickness to be 10% or more and 40% or less of a radius of the first particle in a direction from a surface to a center of the particle in the first particle having a particle size in a range to be ±10% of the volume average particle diameter (MV) of the metal composite hydroxide,
the core portion has a radius to be 60% or more and 90% or less of the radius of the first particle in a direction from the center thereof in the first particle having the particle size in the range to be ±10% of the volume average particle diameter (MV) of the metal composite hydroxide, and
the nickel is distributed uniformly in the entire core portion such that the nickel is detected uniformly therein by energy dispersive X-ray analysis (EDX) on a cross-section of the metal composite hydroxide under a scanning transmission electron microscope (STEM).