Lithium metal composite oxide powder, positive electrode active substance for lithium secondary battery, positive electrode for lithium secondary battery, and lithium secondary battery

Patent metadata

Field	Value
Publication number	US-2021098776-A1
Application number	US-201917042734-A
Country	US
Kind code	A1
Filing date	Mar 27, 2019
Priority date	Mar 29, 2018
Publication date	Apr 1, 2021
Grant date	—

Abstract

A lithium metal composite oxide powder, which comprises primary particles and secondary particles that are aggregates of the primary particles, and has an α-NaFeO 2 type crystal structure, wherein a half width (A) of a diffraction peak in a range of 2θ=18.7±1° in a powder X-ray diffraction measurement for the lithium metal composite oxide powder using CuKα ray is 0.135° or more and 0.165° or less, and a c-axis lattice constant of the α-NaFeO 2 type crystal structure is 14.178 Å or more and 14.235 Å or less.

First claim

1 . A lithium metal composite oxide powder, which comprises primary particles and secondary particles that are aggregates of the primary particles, and has an α-NaFeO 2 type crystal structure,
wherein a half width (A) of a diffraction peak in a range of 2θ=18.7±1° in a powder X-ray diffraction measurement for the lithium metal composite oxide powder using CuKα ray is 0.135° or more and 0.165° or less, and
a c-axis lattice constant of the α-NaFeO 2 type crystal structure is 14.178 Å or more and 14.235 Å or less.

2 . The lithium metal composite oxide powder according to claim 1 , wherein a half width (B) of a diffraction peak in a range of 2θ=44.4±1° in the powder X-ray diffraction measurement using CuKα ray is 0.170° or more and 0.240° or less.

3 . The lithium metal composite oxide powder according to claim 1 , which satisfies composition formula (I):
Li[Li x (Ni (1−y−z−w) CO y Mn z M w ) 1−x ]O 2   (I)
wherein −0.1≤x≤0.2, 0≤y≤0.4, 0≤z≤0.4, 0≤w≤0.1, y+z+w <1 and M is one or more elements 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.

4 . The lithium metal composite oxide powder according to claim 3 , wherein in the composition formula (I), 0<x≤0.2.

5 . The lithium metal composite oxide powder according to claim 3 , wherein in the composition formula (I), y+z+w is 0<y+z+w≤0.3.

6 . The lithium metal composite oxide powder according to claim 1 , further comprising single particles.

7 . The lithium metal composite oxide powder according to claim 1 , wherein an amount of lithium hydroxide is 0.3% by mass or less with respect to a total mass of the lithium metal composite oxide powder, in terms of a value converted from a neutralization titration result for the lithium metal composite oxide powder.

8 . The lithium metal composite oxide powder according to claim 1 , which has an average particle diameter (D 50 ) of 100 nm or more and 10 μm or less as determined by a particle size distribution measurement.

9 . The lithium metal composite oxide powder according to claim 1 , which has a minimum particle diameter (D min ) of 50 nm or more and 2 μm or less as determined by a particle size distribution measurement.

10 . A positive electrode active material for a lithium secondary battery, which comprises the lithium metal composite oxide powder of claim 1 .

11 . A positive electrode for a lithium secondary battery, which comprises the positive electrode active material of claim 10 .

12 . A lithium secondary battery, which comprises the positive electrode of claim 11 .

Assignees

• Sumitomo Chemical Co

Inventors

• Kageura Jun-Ichi
• Nagao Daisuke

Classifications

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title