US10586983B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10586983-B2 |
| Application number | US-201615754726-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 25, 2016 |
| Priority date | Aug 27, 2015 |
| Publication date | Mar 10, 2020 |
| Grant date | Mar 10, 2020 |
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Provided is a positive electrode active material for nonaqueous electrolyte secondary batteries that suppresses the gelling of a positive electrode mixture material paste and has high weather resistance, a production method thereof, and the like. A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries includes cleaning a powder famed of a lithium-nickel composite oxide represented by a general formula Li z Ni 1-x-y Co x M y O 2 where 0≤x≤0.35; 0≤y≤0.10; 0.95≤z≤1.10; and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al with an aqueous solution containing one or more lithium salts selected from water-soluble lithium salts other than lithium hydroxide and drying the cleaned powder.
Opening claim text (preview).
The invention claimed is: 1. A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, the method comprising: cleaning a powder formed of a lithium-nickel composite oxide represented by a general formula Li z Ni 1-x-y Co x M y O 2 where 0≤x≤0.35; 0≤y≤0.10; 0.95≤z≤1.10; and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al with an aqueous solution containing one or more lithium salts selected from water-soluble lithium salts other than lithium hydroxide; and drying the cleaned powder, wherein the cleaning reduces the atomic ratio of Li to the metals other than Li in the lithium-nickel composite oxide. 2. The method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries of claim 1 , wherein a lithium concentration of the aqueous solution is 0.1 g/L or more and 5.0 g/L or less. 3. The method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries of claim 1 , wherein the cleaning comprises cleaning the powder in a state in which a slurry concentration of the aqueous solution containing the powder is 100 g/L or more and 3000 g/L or less. 4. A positive electrode active material for nonaqueous electrolyte secondary batteries, comprising a powder of a lithium-nickel composite oxide represented by a general formula Li z Ni 1-x-y Co x M y O 2 where 0≤x≤0.35; 0≤y≤0.10; 0.95≤z≤1.10; and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al, wherein a lithium hydroxide content of the positive electrode active material is 0.5% by mass or less, and a composition ratio between Li and metals other than Li in a surface of the powder measured by X-ray photoelectron spectroscopy is 0.80 or more and 1.5 or less, the composition ratio being Li/(Ni+Co+M), the metals being Ni, Co, and M. 5. The positive electrode active material for nonaqueous electrolyte secondary batteries of claim 4 , wherein a powder pH of 5% by mass of a suspension solution obtained by dispersing the powder in water is 11.5 or less. 6. A nonaqueous electrolyte secondary battery having the positive electrode active material for nonaqueous electrolyte secondary batteries of claim 4 in a positive electrode. 7. The positive electrode active material for nonaqueous electrolyte secondary batteries of claim 4 , wherein z satisfies 0.95≤z≤1.00 in the general formula.
Positive electrodes · 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
containing elements as dopants · CPC title
of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title
Electric properties · CPC title
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