Positive active material for nonaqueous electrolyte secondary battery
US-2017012289-A1 · Jan 12, 2017 · US
Cathode active material for lithium ion secondary battery and lithium ion secondary battery
US12015154B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12015154-B2 |
| Application number | US-201917264357-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 3, 2019 |
| Priority date | Aug 2, 2018 |
| Publication date | Jun 18, 2024 |
| Grant date | Jun 18, 2024 |
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Abstract
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To provide a cathode active material capable of reducing cathode resistance of a secondary battery by enhancing electron conductivity thereof without reducing discharge capacity of the secondary battery. Lanthanum compound particles each having a perovskite-type structure are dispersed on surfaces of secondary particles of a lithium transition metal-containing composite oxide and/or in gaps or grain boundaries between primary particles thereof. The lanthanum compound particles have a cross-sectional average particle size of 0.70 μm or less. The number of lanthanum compound particles present per unit area of the cross sections of the secondary particles is 0.03 particles/μm2 to 0.10 particles/μm2, and the number of lanthanum compound particles present per unit area of the surfaces of the secondary particles is 0.01 particles/μm2 to 0.25 particles/μm2. The content of lanthanum with respect to the entire cathode active material is within a range of 0.1% by mass to 5% by mass.
First claim
Opening claim text (preview).
The invention claimed is: 1. A cathode active material for a lithium ion secondary battery, the cathode active material comprising a lithium transition metal-containing oxide configured by secondary particles each formed of a plurality of primary particles, wherein lanthanum compound particles each having a perovskite-type structure are dispersed on surfaces of the secondary particles and/or in gaps or grain boundaries between the primary particles, and the lanthanum compound particles have a cross-sectional average particle size of 0.70 μm or less. 2. The cathode active material for a lithium ion secondary battery according to claim 1 , wherein a number of the lanthanum compound particles present per unit area of the surfaces of the secondary particles is within a range of 0.01 particles/μm 2 to 0.25 particles/μm 2 . 3. The cathode active material for a lithium ion secondary battery according to claim 1 , wherein a number of the lanthanum compound particles present per unit area of cross sections of the secondary particles is within a range of 0.03 particles/μm 2 to 0.10 particles/μm 2 . 4. The cathode active material for a lithium ion secondary battery according to claim 1 , wherein the lanthanum compound particles have a surface average particle size of 0.50 μm or less. 5. The cathode active material for a lithium ion secondary battery according to claim 1 , wherein a content of lanthanum with respect to an entire cathode active material is within a range of 0.1% by mass to 5% by mass. 6. The cathode active material for a lithium ion secondary battery according to claim 1 , wherein the lanthanum compound particles contain one or more metal elements selected from the group consisting of nickel, cobalt, and manganese. 7. A lithium ion secondary battery comprising a cathode, an anode, and an electrolyte, wherein the cathode active material for a lithium ion secondary battery according to claim 1 is used as a cathode material for the cathode.
Assignees
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Classifications
of nickel, cobalt or iron · CPC title
Physical characteristics, e.g. porosity, surface area · CPC title
Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title
of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title
of elements or alloys · CPC title
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- What does patent US12015154B2 cover?
- To provide a cathode active material capable of reducing cathode resistance of a secondary battery by enhancing electron conductivity thereof without reducing discharge capacity of the secondary battery. Lanthanum compound particles each having a perovskite-type structure are dispersed on surfaces of secondary particles of a lithium transition metal-containing composite oxide and/or in gaps or …
- Who is the assignee on this patent?
- Sumitomo Metal Mining Co, Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/525. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 18 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).