Electrode for non-aqueous electrolyte secondary battery
US-2020365881-A1 · Nov 19, 2020 · US
Negative electrode and lithium secondary battery including the same
US11876229B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11876229-B2 |
| Application number | US-202017274590-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 28, 2020 |
| Priority date | Jan 28, 2019 |
| Publication date | Jan 16, 2024 |
| Grant date | Jan 16, 2024 |
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- Title
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Abstract
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Disclosed is a negative electrode including: a current collector; a negative electrode active material layer disposed on at least one surface of the current collector, including a silicon-based active material and a conductive material, and containing no binder polymer; and a coating layer disposed on the surface of the negative electrode active material layer and in at least a part of the inside of the pores of the negative electrode active material layer, and containing a coating layer polymer forming a chemical bond with silicon (Si) of the silicon-based active material, wherein the content of the coating layer polymer is 0.3-2 parts by weight based on 100 parts by weight of the negative electrode active material layer, and the coating layer polymer is a mixture of polyacrylic acid with polyvinyl alcohol.
First claim
Opening claim text (preview).
What is claimed is: 1. A negative electrode comprising: a current collector; a negative electrode active material layer disposed on at least one surface of the current collector, comprising a silicon-based active material and a conductive material, and containing no binder polymer; and a coating layer disposed on a surface of the negative electrode active material layer and at least a part of inside of pores of the negative electrode active material layer, and containing a coating layer polymer forming a chemical bond with silicon (Si) of the silicon-based active material, wherein a content of the coating layer polymer is 0.3-2 parts by weight based on 100 parts by weight of the negative electrode active material layer, and the coating layer polymer comprises a mixture of polyacrylic acid with polyvinyl alcohol. 2. The negative electrode according to claim 1 , wherein the content of the coating layer polymer is 0.5-1.5 parts by weight based on 100 parts by weight of the negative electrode active material layer. 3. The negative electrode according to claim 1 , wherein the coating layer polymer comprises polyacrylic acid and polyvinyl alcohol at a weight ratio of 9:1-1:9. 4. The negative electrode according to claim 1 , wherein the negative electrode active material layer consists essentially of the silicon-based active material and the conductive material. 5. A method for manufacturing a negative electrode, comprising: forming a negative electrode active material layer comprising a silicon-based active material and a conductive material and containing no binder polymer onto at least one surface of a current collector; coating a composition for a coating layer comprising a coating layer polymer and a solvent on a surface of the negative electrode active material layer and at least a part of inside of pores of the negative electrode active material layer; and drying the coated composition for a coating layer at 140-190° C. to form a coating layer in which the coating layer polymer forms a chemical bond with silicon (Si) of the silicon-based active material, wherein a content of the coating layer polymer is 0.3-2 parts by weight based on 100 parts by weight of the negative electrode active material layer, and the coating layer polymer comprises a mixture of polyacrylic acid with polyvinyl alcohol. 6. The method for manufacturing a negative electrode according to claim 5 , wherein the content of the coating layer polymer is 0.5-1.5 parts by weight based on 100 parts by weight of the negative electrode active material layer. 7. The method for manufacturing a negative electrode according to claim 5 , wherein the negative electrode active material layer consists essentially of the silicon-based active material and the conductive material. 8. The method for manufacturing a negative electrode according to claim 5 , wherein the coating is carried out through dip coating, spray coating, die coating or a combination of at least two thereof. 9. A lithium secondary battery comprising the negative electrode according to claim 1 .
Assignees
Inventors
Classifications
- H01M4/62Primary
Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title
by coating on electrode collectors · CPC title
involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title
- H01M4/134Primary
Electrodes based on metals, Si or alloys · CPC title
of electrodes based on metals, Si or alloys · CPC title
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Frequently asked questions
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- What does patent US11876229B2 cover?
- Disclosed is a negative electrode including: a current collector; a negative electrode active material layer disposed on at least one surface of the current collector, including a silicon-based active material and a conductive material, and containing no binder polymer; and a coating layer disposed on the surface of the negative electrode active material layer and in at least a part of the insi…
- Who is the assignee on this patent?
- Lg Energy Solution Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/62. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 16 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).