Lithium secondary battery and method for preparing the same
US-2020235419-A1 · Jul 23, 2020 · US
Method of manufacturing negative electrode for secondary battery
US12021217B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12021217-B2 |
| Application number | US-202017292236-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 30, 2020 |
| Priority date | Feb 1, 2019 |
| Publication date | Jun 25, 2024 |
| Grant date | Jun 25, 2024 |
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Abstract
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A method of manufacturing a negative electrode for a secondary battery, which includes: forming a negative electrode structure including a negative electrode current collector and a negative electrode active material layer formed on a surface of the negative electrode current collector; providing a pre-lithiation solution in which a lithium metal counter electrode is immersed and immersing the negative electrode structure in the pre-lithiation solution so that the negative electrode structure is spaced apart from the lithium metal counter electrode; and subjecting the negative electrode structure to a pre-lithiation process, which includes an electrochemical charging process and an electrochemical discharging process performed after the electrochemical charging process, wherein a state of charge (SOC p ) of the negative electrode structure subjected to the pre-lithiation process is in a range of 5% to 50%.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method of manufacturing a negative electrode for a secondary battery, comprising: forming a negative electrode structure comprising a negative electrode current collector and a negative electrode active material layer formed on a surface of the negative electrode current collector; providing a pre-lithiation solution in which a lithium metal counter electrode is immersed and immersing the negative electrode structure in the pre-lithiation solution so that the negative electrode structure is spaced apart from the lithium metal counter electrode; and subjecting the negative electrode structure to a pre-lithiation process, which comprises an electrochemical charging process and an electrochemical discharging process performed after the electrochemical charging process, wherein a state of charge of the negative electrode structure after the pre-lithiation process (SOC p ) is in a range of 5% to 50%. 2. The method of claim 1 , wherein a state of charge (SOC c ) of the negative electrode structure after the electrochemical charging process is in a range of 25% to 100%. 3. The method of claim 1 , wherein the pre-lithiation process further comprises a first intermission process performed between the electrochemical charging process and the electrochemical discharging process. 4. The method of claim 1 , wherein the pre-lithiation process further comprises an electrochemical recharging process performed after the electrochemical discharging process. 5. The method of claim 4 , wherein a state of charge (SOC d ) of the negative electrode structure after the electrochemical discharging process is less than 50%. 6. The method of claim 4 , wherein the pre-lithiation process further comprises a second intermission process performed between the electrochemical discharging process and the electrochemical recharging process. 7. The method of claim 1 , wherein the negative electrode active material layer comprises a negative electrode active material, wherein the negative electrode active material comprises at least one selected from the group consisting of a carbon-based active material and a silicon-based active material. 8. The method of claim 7 , wherein the negative electrode active material comprises the carbon-based active material and the silicon-based active material at a weight ratio of 50:50 to 95:5. 9. The method of claim 1 , wherein the pre-lithiation solution comprises a lithium salt and an organic solvent. 10. The method of claim 1 , wherein the electrochemical charging process and the electrochemical discharging process are each independently performed at a current density of 0.5 mA/cm 2 to 3 mA/cm 2 .
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Classifications
Negative electrodes · CPC title
Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title
- H01M4/386Primary
Silicon or alloys based on silicon · CPC title
by coating on electrode collectors · CPC title
Li-accumulators · CPC title
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- What does patent US12021217B2 cover?
- A method of manufacturing a negative electrode for a secondary battery, which includes: forming a negative electrode structure including a negative electrode current collector and a negative electrode active material layer formed on a surface of the negative electrode current collector; providing a pre-lithiation solution in which a lithium metal counter electrode is immersed and immersing the …
- Who is the assignee on this patent?
- Lg Energy Solution Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/386. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jun 25 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).