Method for producing negative electrode active material for lithium secondary battery, and lithium secondary battery including the same
US-2021143425-A1 · May 13, 2021 · US
Artificial graphite, method for preparing artificial graphite, anode comprising same, and lithium secondary battery
US12401020B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12401020-B2 |
| Application number | US-202117774648-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 8, 2021 |
| Priority date | Jan 10, 2020 |
| Publication date | Aug 26, 2025 |
| Grant date | Aug 26, 2025 |
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Abstract
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A method for preparing artificial graphite, including the steps of: pulverizing a carbonaceous material; carrying out a first deferrization to remove magnetic foreign materials generated by pulverizing the carbonaceous material to form a first deferrization product; granulating the first deferrization product of the first deferrization step to form a granulated product; graphitizing the granulated product to form a graphitized product; and carrying out a second deferrization on the graphitized product to remove magnetic foreign materials from the graphitized product to form the artificial graphite. A negative electrode including the artificial graphite and a lithium secondary battery including the negative electrode are also disclosed.
First claim
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What is claimed is: 1. A method for preparing artificial graphite, comprising the steps of: pulverizing a carbonaceous material; carrying out a first deferrization to remove magnetic foreign materials generated by pulverizing the carbonaceous material to form a first deferrization product; granulating the first deferrization product to form a granulated product; graphitizing the granulated product to form a graphitized product; and carrying out a second deferrization on the graphitized product to remove magnetic foreign materials from the graphitized product to form the artificial graphite, wherein the first deferrization step is performed by using a permanent magnet having a magnetic force in a range of 36,000 Gauss to 40,000 Gauss. 2. The method for preparing artificial graphite according to claim 1 , wherein the carbonaceous material comprises at least one of needle cokes, mosaic cokes, coal tar pitch, or resin pitch. 3. The method for preparing artificial graphite according to claim 1 , wherein each of the first deferrization and the second deferrization is carried out independently by using an electromagnetic deferrization system or a deferrization system using a permanent magnet. 4. The method for preparing artificial graphite according to claim 1 , wherein the granulation step is carried out by using a vertical granulation system or a horizontal granulation system. 5. The method for preparing artificial graphite according to claim 1 , wherein the graphitization step is carried out by using an Acheson graphitization furnace, a box type graphitization furnace or a lengthwise graphitization furnace at a temperature ranging from 2,000° C. to 3,500° C. 6. The method for preparing artificial graphite according to claim 1 , which further comprises a step of carbonizing the graphitized product between the graphitization step and the second deferrization step.
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Classifications
Negative electrodes · 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
Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title
involving compressing or compaction · CPC title
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- What does patent US12401020B2 cover?
- A method for preparing artificial graphite, including the steps of: pulverizing a carbonaceous material; carrying out a first deferrization to remove magnetic foreign materials generated by pulverizing the carbonaceous material to form a first deferrization product; granulating the first deferrization product of the first deferrization step to form a granulated product; graphitizing the granula…
- Who is the assignee on this patent?
- Lg Energy Solution Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/1393. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Aug 26 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).