Positive electrode for lithium secondary battery, and lithium secondary battery
US-2023155125-A1 · May 18, 2023 · US
Cathode for lithium secondary battery and lithium secondary battery including the same
US12394785B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12394785-B2 |
| Application number | US-202217671686-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 15, 2022 |
| Priority date | Feb 16, 2021 |
| Publication date | Aug 19, 2025 |
| Grant date | Aug 19, 2025 |
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- Title
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Abstract
Official abstract text for this publication.
A cathode for a lithium secondary battery includes a cathode current collector, and a cathode active material layer including a first cathode active material layer and a second cathode active material layer sequentially stacked on the cathode current collector. The first cathode active material layer includes a first cathode active material particle having a secondary particle structure, and the second cathode active material layer includes a second cathode active material particle having a single particle shape. An adhesive force of the first cathode active material layer to a surface of the cathode current collector is greater than an adhesive force of the second cathode active material layer to a surface of the first cathode active material layer.
First claim
Opening claim text (preview).
What is claimed is: 1. A cathode for a lithium secondary battery, comprising: a cathode current collector; and a cathode active material layer comprising a first cathode active material layer and a second cathode active material layer sequentially stacked on the cathode current collector, wherein the first cathode active material layer comprises a first cathode active material particle having a secondary particle structure, and the second cathode active material layer comprises a second cathode active material particle having a single particle shape, wherein an adhesive force of the first cathode active material layer to a surface of the cathode current collector is greater than an adhesive force of the second cathode active material layer to a surface of the first cathode active material layer; and a ratio of the adhesive force of the first cathode active material layer to the surface of the cathode current collector relative to the adhesive force of the second cathode active material layer to the surface of the first cathode active material layer is from 1.4 to 8.1, and wherein a ratio of the content of the binder in the first cathode active material layer relative to the content of the binder in the second cathode active material layer is from 2 to 4. 2. The cathode for a lithium secondary battery of claim 1 , wherein a ratio of the adhesive force of the first cathode active material layer to the surface of the cathode current collector relative to the adhesive force of the second cathode active material layer to the surface of the first cathode active material layer is from 1.4 to 8. 3. The cathode for a lithium secondary battery of claim 1 , wherein each of the first cathode active material layer and the second cathode active material layer further comprises a binder, and wherein a content of the binder in the first cathode active material layer is greater than a content of the binder in the second cathode active material layer. 4. The cathode for a lithium secondary battery of claim 1 , wherein each of the first cathode active material particle and the second cathode active material particle comprises a lithium metal oxide containing nickel, and wherein a content of nickel comprised in the first cathode active material particle is greater than or equal to a content of nickel comprised in the second cathode active material particle. 5. The cathode for a lithium secondary battery of claim 4 , wherein each of the first cathode active material particle and the second cathode active material particle further contains cobalt and manganese, wherein a molar ratio of nickel among nickel, cobalt and manganese in the first cathode active material particle is 0.8 or more, and wherein a molar ratio of nickel among nickel, cobalt and manganese in the second cathode active material particle is 0.5 or more. 6. The cathode for a lithium secondary battery of claim 5 , wherein the first cathode active material particle comprises a concentration non-uniformity region of at least one element of nickel, cobalt and manganese between a central portion and a surface portion. 7. The cathode for a lithium secondary battery of claim 6 , wherein each of nickel, cobalt and manganese contained in the second cathode active material particle has a constant concentration from a central portion to a surface portion. 8. The cathode for a lithium secondary battery of claim 1 , wherein an average particle diameter of the second cathode active material particle is smaller than an average particle diameter of the first cathode active material particle. 9. The cathode for a lithium secondary battery of claim 1 , wherein a thickness of the second cathode active material layer is smaller than a thickness of the first cathode active material layer. 10. A lithium secondary battery, comprising: a case; and an electrode assembly accommodated in the case, the electrode assembly comprising an anode and the cathode for a lithium secondary battery according to claim 1 facing the anode.
Assignees
Inventors
Classifications
Energy storage using batteries · CPC title
fluorinated polymers · CPC title
- H01M4/131Primary
Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title
Binders · CPC title
Positive electrodes · CPC title
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Frequently asked questions
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- What does patent US12394785B2 cover?
- A cathode for a lithium secondary battery includes a cathode current collector, and a cathode active material layer including a first cathode active material layer and a second cathode active material layer sequentially stacked on the cathode current collector. The first cathode active material layer includes a first cathode active material particle having a secondary particle structure, and th…
- Who is the assignee on this patent?
- Sk On Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/131. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Aug 19 2025 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).