US11837719B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11837719-B2 |
| Application number | US-201816758314-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 13, 2018 |
| Priority date | Nov 13, 2017 |
| Publication date | Dec 5, 2023 |
| Grant date | Dec 5, 2023 |
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A method for preparing a lithium cobalt-based positive electrode active material and a positive electrode active material prepared by the method are provided. The method includes dry-mixing and then heat treating a lithium cobalt oxide particle represented by Formula 1 and one or more lithium metal oxide particle selected from the group consisting of lithium aluminum oxide, lithium zirconium oxide, and lithium titanium oxide.
Opening claim text (preview).
The invention claimed is: 1. A lithium cobalt-based positive electrode active material comprising: a lithium cobalt-based oxide particle represented by Formula 1 below; and a coating layer formed on the lithium cobalt-based oxide particle, wherein the coating layer includes lithium aluminum oxide, wherein an atomic ratio of Li/Co in an interface between the lithium cobalt-based oxide particle and the coating layer and in the coating layer is 1 or greater: LiCo 1-x M x O 2 [Formula 1] wherein, M is one or more selected from the group consisting of Al, Mg, W, Mo, Zr, Ti, Fe, V, Cr, Ba, Ca, and Nb, and 0≤x≤0.2, and wherein a cobalt elution amount is 700 ppm or less when the cobalt elution amount is measured for a secondary battery to which the lithium cobalt-based positive electrode active material is applied, and which is charged to 4.5 V and then stored for two weeks at 60° C. 2. The lithium cobalt-based positive electrode active material of claim 1 , wherein the lithium metal oxide is included in an amount of 0.01-0.5 parts by weight based on 100 parts by weight of a total positive electrode active material. 3. A positive electrode comprising the positive electrode active material according to claim 1 . 4. A lithium secondary battery comprising the positive electrode of claim 3 . 5. A lithium secondary battery of claim 4 , wherein a driving voltage of the lithium secondary battery is 4.45 V or greater. 6. A method for preparing a lithium cobalt-based positive electrode active material, comprising: dry-mixing and then heat treating a lithium cobalt oxide particle represented by Formula 1 below and a lithium metal oxide particle, to form a lithium cobalt particle having a coating layer formed thereon, wherein the lithium metal oxide particle includes lithium aluminum oxide, wherein an atomic ratio of Li/Co in an interface between the lithium cobalt-based oxide particle and the coating layer and in the coating layer is 1 or greater, and wherein a cobalt elution amount is 700 ppm or less when the cobalt elution amount is measured for a secondary battery to which the lithium cobalt-based positive electrode active material is applied, and which is charged to 4.5 V and then stored for two weeks at 60° C.: LiCo 1-x M x O 2 [Formula 1] wherein, M is one or more selected from the group consisting of Al, Mg, W, Mo, Zr, Ti, Fe, V, Cr, Ba, Ca, and Nb, and 0≤x≤0.2. 7. The method of claim 6 , wherein the heat treating is performed at 300° C. to 800° C. 8. The method of claim 6 , wherein the lithium metal oxide particle is mixed in an amount of 0.01-0.5 parts by weight based on 100 parts by weight of a total weight of the lithium cobalt oxide particle and the lithium metal oxide particle.
as layered products · CPC title
containing alkali metals, e.g. LiCoO2 · CPC title
of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title
of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title
Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title
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