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US-2018145327-A1 · May 24, 2018 · US
Graphite material for negative electrode of lithium ion secondary cell and method for producing the same
US10950860B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10950860-B2 |
| Application number | US-201816122607-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 5, 2018 |
| Priority date | Sep 14, 2017 |
| Publication date | Mar 16, 2021 |
| Grant date | Mar 16, 2021 |
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Abstract
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A graphite material for a negative electrode of a lithium ion secondary cell disclosed herein is substantially configured of a graphite particle in which defects enabling intercalation/deintercalation of lithium ions have been formed on a basal plane and which includes a calcium (Ca) component.
First claim
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What is claimed is: 1. A graphite material for a negative electrode of a lithium ion secondary cell, the graphite material being substantially configured of a graphite particle in which defects enabling intercalation/deintercalation of lithium ions have been formed on a basal plane, wherein the graphite particle comprises a calcium (Ca) component in the basal plane, and calcium carbonate is included as the calcium component. 2. The graphite material for a negative electrode of a lithium ion secondary cell according to claim 1 , wherein the calcium component is present in the graphite particle in an amount such that the amount of calcium is 0.5 mg/m 2 or more and 15 mg/m 2 or less with respect to a specific surface area of the graphite particle. 3. A lithium ion secondary cell comprising a negative electrode and a positive electrode, the negative electrode comprising a graphite material being substantially configured of a graphite particle in which defects enabling intercalation/deintercalation of lithium ions have been formed on a basal plane, wherein the graphite particle comprises a calcium (Ca) component in the basal plane, and calcium carbonate is included as the calcium component. 4. The lithium ion secondary cell according to claim 3 , wherein the calcium component is present in the graphite particle in an amount such that the amount of calcium is 0.5 mg/m 2 or more and 15 mg/m 2 or less with respect to a specific surface area of the graphite particle. 5. A method for producing a graphite material for a negative electrode of a lithium ion secondary cell, the method comprising: supplying a calcium-containing substance to a surface of a graphite particle; and supporting a calcium component in a basal plane of the graphite particle by heat treating the graphite particle supplied with the calcium-containing substance on the surface thereof in a temperature range in which the calcium-containing substance and the basal plane can react with each other to generate defects enabling intercalation/deintercalation of lithium ions on the basal plane of the graphite particle. 6. The production method according to claim 5 , including supporting calcium carbonate as the calcium component in the basal plane of the graphite particle by heat-treating the graphite particle supplied with the calcium-containing substance on the surface thereof in the temperature range in a carbon dioxide gas atmosphere. 7. The production method according to claim 6 , wherein the temperature range is about 800° C. to 1000° C. 8. The production method according to claim 5 , wherein the temperature range is about 800° C. to 1000° C.
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- What does patent US10950860B2 cover?
- A graphite material for a negative electrode of a lithium ion secondary cell disclosed herein is substantially configured of a graphite particle in which defects enabling intercalation/deintercalation of lithium ions have been formed on a basal plane and which includes a calcium (Ca) component.
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/364. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 16 2021 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).