US 11,855,247 B2
Lithium-containing transition metal composite oxide, positive electrode active material for lithium secondary battery, positive electrode for lithium secondary battery, lithium secondary battery, and method for manufacturing lithium-containing transition metal composite oxide
Takashi Arimura, Tsukuba (JP); Kenji Takamori, Fukui (JP); Jun-Ichi Kageura, Niihama (JP); Yuichi Sato, Niihama (JP); and Yusuke Maeda, Fukui (JP)
Assigned to SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP); and TANAKA CHEMICAL CORPORATION, Fukui (JP)
Appl. No. 16/767,023
Filed by SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo (JP); and TANAKA CHEMICAL CORPORATION, Fukui (JP)
PCT Filed Nov. 30, 2018, PCT No. PCT/JP2018/044194
§ 371(c)(1), (2) Date May 26, 2020,
PCT Pub. No. WO2019/107545, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 2017-230733 (JP), filed on Nov. 30, 2017.
Prior Publication US 2020/0303734 A1, Sep. 24, 2020
Int. Cl. H01M 4/505 (2010.01); H01M 4/1391 (2010.01); H01M 4/36 (2006.01); H01M 4/525 (2010.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/505 (2013.01) [H01M 4/1391 (2013.01); H01M 4/364 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2002/74 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A lithium-containing transition metal composite oxide, comprising:
secondary particles that are aggregates of primary particles into or from which lithium ions are dopable or dedopable,
wherein a 50% cumulative volume particle size D50 of the lithium-containing transition metal composite oxide is 5 μm or more and 20 μm or less,
wherein the lithium-containing transition metal composite oxide satisfies the following conditions,
(1) the lithium-containing transition metal composite oxide is represented by Formula (I),
Li[Lix(Ni(1-y-z-w)CoyMnzMw)1-x]O2  (I)
(in Formula (I), 0≤x≤0.1, 0<y≤0.5, 0≤z≤0.8, 0≤w≤0.1, and y+z+w<1 are satisfied, and M represents one or more metals selected from the group consisting of Mg, Ca, Sr, Ba, Zn, B, Al, Ga, Ti, Zr, Ge, Fe, Cu, Cr, V, W, Mo, Sc, Y, Nb, La, Ta, Tc, Ru, Rh, Pd, Ag, Cd, In, and Sn), and
(2) when an area value of a peak appearing at 53.8 eV in a lithium 1 s spectrum is referred to as a and an area value of a peak appearing at 529.0 eV in an oxygen 1 s spectrum is referred to as β when X-ray photoelectron spectroscopy is performed, and a ratio between α and β is referred to as γ (α/β=γ),
γ is calculated for each of a surface of the secondary particle and an inside of the secondary particle, and when a γ value of the surface of the secondary particle is referred to as γ1 and a γ value of the inside of the secondary particle is referred to as γ2, γ1 and γ2 satisfy a condition of Formula (II)
0.3≤γ1/γ2<1.0  (II)
wherein the lithium-containing transition metal composite oxide is manufactured by a method comprising:
a mixing step of mixing a lithium compound and a metal composite compound containing at least nickel to obtain a mixture;
a baking step of baking the mixture to obtain a baked product; and
a washing step of washing the baked product,
wherein, in the mixing step, mixing is performed so that a molar ratio (Li/Me, a molar ratio of lithium to a total amount of metal elements excluding lithium) between lithium contained in the lithium compound and metal elements in the metal composite compound containing at least nickel exceeds 1, and
in the washing step, a temperature of a washing solution used for washing is set to −20° C. or higher and 40° C. or lower, and washing is performed in an amount of the washing solution used for washing such that a concentration of lithium carbonate in the washing solution in a case where it is assumed that a total amount of residual lithium carbonate contained in the baked product before washing is dissolved in the washing solution is 1/10 or more and 3 or less times a solubility of lithium carbonate in the washing solution at the temperature of the washing solution during the washing step.