US12454465B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12454465-B2 |
| Application number | US-201917425152-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 26, 2019 |
| Priority date | Jan 22, 2019 |
| Publication date | Oct 28, 2025 |
| Grant date | Oct 28, 2025 |
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A nickel manganese cobalt composite hydroxide, which is a precursor of a positive electrode active material, and which is composed of secondary particles to which primary particles containing a nickel, a manganese, and a cobalt are aggregated, or composed of the primary particles and the secondary particles, wherein a sodium content contained in the nickel manganese cobalt composite hydroxide is less than 0.0005% by mass. Also, a ratio of an average particle size of a lithium nickel manganese cobalt composite oxide divided by an average particle size of the nickel manganese cobalt composite hydroxide, which is a precursor, is 0.95 to 1.05, and further, when observing 100 or more particles of the lithium nickel manganese cobalt composite oxide selected randomly by a scanning electron microscope, a number that an aggregation of secondary particles is observed is 5% or less with respect to a total number of observed secondary particles.
Opening claim text (preview).
The invention claimed is: 1. A lithium nickel manganese cobalt composite oxide composed of secondary particles to which primary particles containing a lithium, a nickel, a manganese, and a cobalt are aggregated, or composed of the primary particles and the secondary particles, wherein a sodium content contained in the lithium nickel manganese cobalt composite oxide is less than 0.0005% by mass and a chloride radical content contained in the lithium nickel manganese cobalt composite oxide is 0.005% by mass or less, and wherein when observing 100 or more particles of the lithium nickel manganese cobalt composite oxide selected randomly by a scanning electron microscope, a number that an aggregation of secondary particles is observed is 5% or less with respect to a total number of observed secondary particles. 2. The lithium nickel manganese cobalt composite oxide according to claim 1 , wherein a sulfate radical content contained in the lithium nickel manganese cobalt composite oxide is 0.15% by mass or less, and a Me site occupancy factor is 93.0% or more. 3. The lithium nickel manganese cobalt composite oxide according to claim 1 , wherein a ratio of an average particle size of the lithium nickel manganese cobalt composite oxide divided by an average particle size of a nickel manganese cobalt composite hydroxide, which is a precursor, is 0.95 to 1.05. 4. The lithium nickel manganese cobalt composite oxide according to claim 1 , wherein a content of at least one of a potassium, a calcium, and a magnesium contained in the lithium nickel manganese cobalt composite oxide is less than 0.0005% by mass. 5. The lithium nickel manganese cobalt composite oxide according to claim 1 , wherein the secondary particles have a solid, non-porous and non-hollow, structure. 6. A lithium ion secondary battery comprising a positive electrode at least containing the lithium nickel manganese cobalt composite oxide according to claim 1 .
Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title
Surface area · CPC title
Particles characterised by their size · CPC title
Particles with a specific particle size distribution · CPC title
of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title
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