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US-2024093708-A1 · Mar 21, 2024 · US
Negative electrode active material for nickel-metal hydride battery, and method for producing the same
US2025263822A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2025263822-A1 |
| Application number | US-202519044363-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 3, 2025 |
| Priority date | Feb 15, 2024 |
| Publication date | Aug 21, 2025 |
| Grant date | — |
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Abstract
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The present disclosure provides a negative electrode active material for a nickel-metal hydride battery containing a hydrogen-absorbing alloy that contains Ti, Zr, Cr, Mn, and Ni, and further contains one or more elements selected from the group consisting of La and Ce, wherein a total content proportion of the one or more elements selected from the group consisting of La and Ce based on the entire hydrogen-absorbing alloy is 8 at % or less, and a method for producing the same.
First claim
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What is claimed is: 1 . A negative electrode active material for a nickel-metal hydride battery, comprising a hydrogen-absorbing alloy that comprises Ti, Zr, Cr, Mn, and Ni, and further comprises one or more elements selected from the group consisting of La and Ce, wherein a total content proportion of the one or more elements selected from the group consisting of La and Ce based on the entire hydrogen-absorbing alloy is 8 at % or less. 2 . The negative electrode active material for a nickel-metal hydride battery according to claim 1 , wherein: the hydrogen-absorbing alloy contains a main phase, a grain boundary phase, and a third phase; the main phase is an AB 2 type alloy phase, and the grain phase is an AB type alloy phase; in the AB 2 type alloy phase, A is one or more elements selected from the group consisting of Ti and Zr, and B is one or more elements selected from the group consisting of Cr, Mn, and Ni; in the AB type alloy phase, A is one or more elements selected from the group consisting of Ti and Zr, and B is Ni; and the third phase is an alloy phase containing one or more elements selected from the group consisting of La and Ce, and Ni. 3 . The negative electrode active material for a nickel-metal hydride battery according to claim 1 , wherein a content proportion of Ni in the main phase is 14 at % or more and 21 at % or less based on the entire main phase. 4 . A method for producing a negative electrode active material for a nickel-metal hydride battery, the method comprising: melting a raw material comprising Ti, Zr, Cr, Mn, and Ni, and further comprising one or more elements selected from the group consisting of La and Ce to obtain a molten metal; and cooling the molten metal to solidify the molten metal and thereby obtain an ingot of a hydrogen-absorbing alloy, wherein a total content of the one or more elements selected from the group consisting of La and Ce based on the entire molten metal is 8 at % or less. 5 . The method for producing a negative electrode active material for a nickel-metal hydride battery according to claim 4 , further comprising exposing the ingot to an alkaline solution.
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- What does patent US2025263822A1 cover?
- The present disclosure provides a negative electrode active material for a nickel-metal hydride battery containing a hydrogen-absorbing alloy that contains Ti, Zr, Cr, Mn, and Ni, and further contains one or more elements selected from the group consisting of La and Ce, wherein a total content proportion of the one or more elements selected from the group consisting of La and Ce based on the en…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd, Aichi Steel Corp, Japan Metals And Chemicals Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C22C30/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Aug 21 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).