Hydrogen storing alloy, electrode, and nickel-hydrogen storage battery

Patent metadata

Field	Value
Publication number	US-10323301-B2
Application number	US-201514866070-A
Country	US
Kind code	B2
Filing date	Sep 25, 2015
Priority date	Sep 30, 2014
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

Provided is a hydrogen storing alloy represented by the general formula:
(RE 1-a-b Sm a Mg b )(Ni 1-c-d Al c M d ) x (where 0.3<a<0.6; 0<b<0.16; 0.1<cx<0.2; 0≤dx≤0.1; 3.2<x<3.5; RE is at least one element selected from the group consisting of a rare earth element other than Sm, and Y, and essentially contains La; and M is Mn and/or Co). Also provided is a hydrogen storing alloy represented by the general formula: (RE 1-a-b Sm a Mg b )(Ni 1-c-d Al c M d ) x (where 0.1<a<0.25; 0.1<b<0.2; 0.02<cx<0.2; 0≤dx≤0.1; 3.6<x<3.7; RE is at least one element selected from the group consisting of a rare earth element other than Sm, and Y, and essentially contains La; and M is Mn and/or Co). Further provided is a nickel-metal hydride rechargeable battery including a negative electrode containing the hydrogen storing alloy.

First claim

What is claimed is:

1. A hydrogen storing alloy represented by the general formula: (RE 1-a-b Sm a Mg b )(Ni 1-c-d Al c M d ) x (where 0.3<a<0.6; 0<b<0.16; 0.1<cx<0.2; 0≤dx≤0.1; 3.2<x<3.5; RE is at least one element selected from the group consisting of a rare earth element other than Sm, and Y, and essentially contains La; and M is Mn and/or Co),
wherein the content of La in RE is 0.3 or more in terms of a molar amount based on the total amount of RE, Sm and Mg.

2. The hydrogen storing alloy according to claim 1 , wherein RE contains Nd and/or Pr.

3. The hydrogen storing alloy according to claim 2 , wherein the hydrogen storing alloy contains 70% by mass or more of a Ce 2 Ni 7 phase as a crystal phase of the alloy.

4. The hydrogen storing alloy according to claim 1 , wherein the hydrogen storing alloy contains 70% by mass or more of a Ce 2 Ni 7 phase as a crystal phase of the alloy.

5. An electrode comprising the hydrogen storing alloy according to claim 1 .

6. A nickel-metal hydride rechargeable battery comprising the electrode according to claim 5 as a negative electrode.

7. A hydrogen storing alloy represented by the general formula: (RE 1-a-b Sm a Mg b )(Ni 1-c-d Al c M d ) x (where 0.1≤a≤0.25; 0.1<b<0.2; 0.02<cx<0.2; 0≤dx≤0.1; 3.6≤x≤3.7; RE is at least two elements selected from the group consisting of a rare earth element other than Sm, and Y, and essentially contains La and contains Nd and/or Pr; and M is Mn and/or Co).

8. The hydrogen storing alloy according to claim 7 , wherein the content of La in RE is 0.6 or more in terms of a molar amount based on the total amount of RE, Sm and Mg.

9. The hydrogen storing alloy according to claim 8 , wherein the hydrogen storing alloy contains 80% by mass or more of a Pr 5 Co 19 phase and Ce 5 Co 19 phase as a crystal phase of the alloy.

10. The hydrogen storing alloy according to claim 7 , wherein the hydrogen storing alloy contains 80% by mass or more of a Pr 5 Co 19 phase and Ce 5 Co 19 phase as a crystal phase of the alloy.

11. An electrode comprising the hydrogen storing alloy according to claim 7 .

12. A nickel-metal hydride rechargeable battery comprising the electrode according to claim 11 as a negative electrode.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Okuda Daisuke
• Kanemoto Manabu
• Kodama Mitsuhiro

Classifications

• B22F9/082

  atomising using a fluid (using centrifugal force B22F9/10) · CPC title

• H01M10/30

  Nickel accumulators (H01M10/34 takes precedence) · CPC title

• C22C19/007

  with a light metal (alkali metal Li, Na, K, Rb, Cs; earth alkali metal Be, Mg, Ca, Sr, Ba, Al Ga, Ge, Ti) or B, Si, Zr, Hf, Sc, Y, lanthanides, actinides, as the next major constituent · CPC title

• C22C1/05

  Mixtures of metal powder with non-metallic powder (C22C1/08 takes precedence) · CPC title

• B22F1/0003

  Operations & Transport · mapped topic