Negative electrode active material for non-aqueous electrolyte secondary batteries, and non-aqueous electrolyte secondary battery
US-2017346066-A1 · Nov 30, 2017 · US
Negative electrode active material, mixed negative electrode active material, and method of producing negative electrode active material
US11594716B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11594716-B2 |
| Application number | US-201816476715-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 19, 2018 |
| Priority date | Mar 13, 2017 |
| Publication date | Feb 28, 2023 |
| Grant date | Feb 28, 2023 |
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Abstract
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A negative electrode active material containing a negative electrode active material particle which includes a silicon compound particle containing a silicon compound (SiOx: 0.5≤x≤1.6). The silicon compound particle has three or more peaks in a chemical shift value ranging from −40 ppm to −120 ppm but has no peak in a chemical shift value within a range of −65±3 ppm in a spectrum obtained from 29Si-MAS-NMR of the silicon compound particle. This provides a negative electrode active material capable of improving cycle characteristics when it is used as a negative electrode active material for a secondary battery.
First claim
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The invention claimed is: 1. A negative electrode active material containing a negative electrode active material particle that has a surface layer portion containing a carbon material; the negative electrode active material particle comprising a silicon compound particle containing a silicon compound (SiO x : 0.5≤x≤1.6), wherein: the silicon compound particle has three or more peaks in a chemical shift value ranging from −40 ppm to −120 ppm but has no peak in a chemical shift value within a range of −65±3 ppm in a spectrum obtained from 29 Si-MAS-NMR of the silicon compound particle, and the silicon compound particle has a BET specific surface area that is in a range of 8 m 2 /g or less. 2. The negative electrode active material according to claim 1 , wherein the silicon compound particle has a BET specific surface area that is in a range of 6.5 m 2 /g or less. 3. The negative electrode active material according to claim 1 , wherein an average thickness of the carbon material is 5 nm or more and 5000 nm or less. 4. A mixed negative electrode active material comprising: the negative electrode active material according to claim 1 ; and a carbon-based active material. 5. A mixed negative electrode active material comprising: the negative electrode active material according to claim 2 ; and a carbon-based active material. 6. A mixed negative electrode active material comprising: the negative electrode active material according to claim 3 ; and a carbon-based active material. 7. A method of producing a negative electrode active material containing a negative electrode active material particle including a silicon compound particle, comprising the steps of: preparing silicon compound particles each containing a silicon compound (SiO x : 0.5≤x≤1.6); selecting, from the silicon compound particles, a silicon compound particle which has three or more peaks in a chemical shift value ranging from −40 ppm to −120 ppm but has no peak in a chemical shift value within a range of −65±3 ppm in a spectrum obtained by 29 Si-MAS-NMR; using the selected silicon compound particle to prepare a negative electrode active material particle; and using the prepared negative electrode active material particle to produce a negative electrode active material. 8. The negative electrode active material according to claim 1 , wherein the silicon compound particle has a BET specific surface area that is in a range of 3.2 m 2 /g or more and 8 m 2 /g or less.
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Classifications
Energy storage using batteries · CPC title
- H01M4/133Primary
Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title
Silicon or alloys based on silicon · CPC title
Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title
Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title
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- What does patent US11594716B2 cover?
- A negative electrode active material containing a negative electrode active material particle which includes a silicon compound particle containing a silicon compound (SiOx: 0.5≤x≤1.6). The silicon compound particle has three or more peaks in a chemical shift value ranging from −40 ppm to −120 ppm but has no peak in a chemical shift value within a range of −65±3 ppm in a spectrum obtained from …
- Who is the assignee on this patent?
- Shinetsu Chemical Co
- What technology area does this patent fall under?
- Primary CPC classification H01M4/133. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 28 2023 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).