Positive electrode active material for lithium ion secondary battery, method of manufacturing positive electrode active material for lithium ion secondary battery, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-12087944-B2
Application number	US-201917263621-A
Country	US
Kind code	B2
Filing date	Jul 30, 2019
Priority date	Jul 31, 2018
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

The present invention relates to a positive electrode active material for a lithium ion secondary battery, including: lithium-nickel-manganese composite oxide particles having a layered hexagonal crystal system, wherein, the lithium-nickel-manganese composite oxide is represented by the following general formula:

Li 1+t Ni a Mn b M c Mg d O 2+α   (1)

in which an element M in the general formula (1) is at least one element selected from Co, Ti, W, B, Mo, V, Nb, Ca, Al, Cr, Zr, and Ta; −0.05≤t≤0.2, 0.50≤a≤0.95, 0.03≤b≤0.40, 0.02≤c≤0.40, 0.0005≤d≤0.05, a+b+c+d=1.0, and 0≤α≤0.5; wherein the lithium-nickel-manganese composite oxide particles contains secondary particles formed by aggregation of primary particles of the lithium-nickel-manganese composite oxide particles, and wherein lattice constants a and c of the lithium-nickel-manganese composite oxide as determined by an X-ray diffraction method are 2.8640 Å≤a≤2.8750 Å and 14.195 Å≤c≤14.225 Å.

First claim

The invention claimed is:

1. A method of manufacturing a positive electrode active material for a lithium ion secondary battery comprising:
obtaining nickel-manganese composite hydroxide particles represented by a following general formula:
Ni a Mn b M-Mg d (OH) 2+β   (2)

in which an element M in the general formula (2) is at least one element selected from Co, Ti, W, B, Mo, V, Nb, Ca, Al, Cr, Zr, and Ta, 0.50≤a≤0.95, 0.03≤b≤0.40, 0.02≤c≤0.40, 0.0005≤d≤0.05, a+b+c+d=1.0, and 0≤β≤0.4;
mixing the nickel-manganese composite hydroxide particles and a lithium compound to obtain a raw material mixture; and
firing the raw material mixture in a temperature range of 700° C. to 1000° C. in an oxidizing atmosphere to obtain a lithium-nickel-manganese composite oxide
wherein in the obtaining of the nickel-manganese composite hydroxide particles, a mixed aqueous solution containing at least nickel, manganese, and magnesium, and an alkaline aqueous solution are continuously supplied to a reactor, and a precipitate is collected by overflowing from the reactor.

2. The method of manufacturing a positive electrode active material for a lithium ion secondary battery according to claim 1 , further comprising:
heating the nickel-manganese composite hydroxide particles at a temperature of 105° C. or higher and 700° C. or lower prior to mixing the nickel-manganese composite hydroxide particles and a lithium compound.

Assignees

• Sumitomo Metal Mining Co

Inventors

• KANEDA Haruki
• Koshika Yuki
• Nakamura Takuma

Classifications

• C01G53/82 Primary

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title