Negative electrode active material for lithium ion secondary battery, method for producing the same, negative electrode, and battery
US-2015325853-A1 · Nov 12, 2015 · US
Negative electrode active material for lithium ion secondary battery
US10044033B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10044033-B2 |
| Application number | US-201715459088-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 15, 2017 |
| Priority date | Mar 30, 2013 |
| Publication date | Aug 7, 2018 |
| Grant date | Aug 7, 2018 |
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Abstract
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A negative electrode active material for a lithium ion secondary battery, comprising silicon, copper and oxygen as major constitutional elements, the negative electrode active material for a lithium ion secondary battery, containing fine particles of silicon having an average crystallite diameter (Dx) measured by an X-ray diffractometry of 50 nm or less, and having elemental ratios, expressed by molar ratios, Cu/(Si+Cu+O) and O/(Si+Cu+O) of from 0.02 to 0.30, wherein the negative electrode active material contains an intermetallic compound of silicon and copper.
First claim
Opening claim text (preview).
The invention claimed is: 1. A negative electrode active material for a lithium ion secondary battery, comprising silicon, copper and oxygen as major constitutional elements, the negative electrode active material for the lithium ion secondary battery, containing fine particles of silicon having an average crystallite diameter (D x ) measured by an X-ray diffractometry using a half value width of the (111) plane of the silicon phase of 50 nm or less, and having average elemental ratios measured by an energy dispersive X-ray analysis in a measurement field of 200 μm×200 μm, expressed by molar ratios, Cu/(Si+Cu+O) of from 0.02 to 0.30 and O/(Si+Cu+O) of from 0.02 to 0.30, wherein the negative electrode active material contains an intermetallic compound of silicon and copper. 2. The negative electrode active material for a lithium ion secondary battery according to claim 1 , wherein the negative electrode active material contains an amorphous silicon oxide. 3. The negative electrode active material for a lithium ion secondary battery according to claim 1 , wherein the intermetallic compound of silicon and copper is Cu 3 Si. 4. The negative electrode active material for a lithium ion secondary battery according to claim 3 , wherein a peak intensity ratio of the negative electrode active material (Cu 3 Si/Si) calculated from a result of an X-ray diffractometry measurement is from 0.05 to 1.5.
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Classifications
Silicon · CPC title
Copper · CPC title
Alkali metal silicates ({C01B33/24} , C01B33/26 take precedence) · CPC title
of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title
Electric properties · CPC title
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- What does patent US10044033B2 cover?
- A negative electrode active material for a lithium ion secondary battery, comprising silicon, copper and oxygen as major constitutional elements, the negative electrode active material for a lithium ion secondary battery, containing fine particles of silicon having an average crystallite diameter (Dx) measured by an X-ray diffractometry of 50 nm or less, and having elemental ratios, expressed b…
- Who is the assignee on this patent?
- Univ Tohoku, Dowa Holdings Co 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 Aug 07 2018 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).