Hydrogen storage alloy for alkaline storage battery and alkaline storage battery using the same

Patent metadata

Field	Value
Publication number	US-12024757-B2
Application number	US-201917290364-A
Country	US
Kind code	B2
Filing date	Oct 1, 2019
Priority date	Nov 15, 2018
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

A hydrogen storage alloy suitable for a negative electrode of an on-board alkaline storage battery, and an alkaline storage battery using the alloy, which has an AB 3 -type crystal structure as a main phase, represented by: (Sm x La y R z ) 1-a-b Mg a T b Ni c Co d Me. (R is selected from Pr, Nd; T is selected from Ti, Zr, Hf; M is selected from V, Nb, Ta, Cr, Mo, W, Mn, Fe, Cu, Al, Si, P, B; the following conditions are met: 0<x<1.0, 0<y<1.0, 0.8≤x+y≤1.0, x+y+z=1.0; 0.93≤(x−y)·(1−a−b)+4.5( a +b)≤1.62, 0<a≤0.45, 0≤b≤0.05, 0≤d≤0.7, 0≤e≤0.15, 2.85≤c+d+e≤3.15 and 0.01≤d+e).

First claim

The invention claimed is:

1. A hydrogen storage alloy used for an alkaline storage battery in which an electrode group including a nickel positive electrode, a hydrogen storage alloy negative electrode, and a separator is housed inside an exterior can along with an alkaline electrolytic solution,
wherein
a main phase of the hydrogen storage alloy has a crystal structure of an AB 3 -type structure, and the hydrogen storage alloy has an element composition represented by the following general formula (1):
(Sm x La y R z ) 1-a-b Mg a T b Ni c Co d M e   (1),

wherein R, T, and M in the formula (1) are as follows:
R is one or two selected from Pr and Nd, wherein an atomic ratio of each of Pr and Nd in the Sm x La y R z rare earth elements is up to 0.1;
T is one or two or more selected from Ti, Zr, and Hf; and
M is one or two or more selected from V, Nb, Ta, Cr, Mo, W, Mn, Fe, Cu, Al, Si, P, and B, and

wherein suffixes x, y, z, a, b, c, d, and e meet the following conditions:
0< x< 1.0,0< y< 1.0,0.8≤ x+y≤ 1.0, x+y+z= 1.0;

0.93≤( x−y )·(1− a−b )+4.5( a+b )≤1.62;

0< a< 0.45;
0≤ b≤ 0.05;

0≤ d≤ 0.7;

0≤ e≤ 0.15;

2.85≤ c+d+e≤ 3.15; and

0.01 ≤ d+e.

2. The hydrogen storage alloy for an alkaline storage battery according to claim 1 , wherein
the hydrogen storage alloy has a particle size D50 on a basis of mass of 3 to 20 m.

3. The hydrogen storage alloy for an alkaline storage battery according to claim 2 , wherein
the hydrogen storage alloy has a particle size D90 on a basis of mass of 8 to 50 μm.

4. The hydrogen storage alloy for an alkaline storage battery according to claim 3 , wherein
the hydrogen storage alloy has an alkali-treated layer or an acid-treated layer on a surface.

5. The hydrogen storage alloy for an alkaline storage battery according to claim 2 , wherein
the hydrogen storage alloy has an alkali-treated layer or an acid-treated layer on a surface.

6. An alkaline storage battery using the hydrogen storage alloy according to claim 2 as a negative electrode,
wherein
the alkaline storage battery is installed in a hybrid electric vehicle having a motor as a driving source and supplies electricity to the motor.

7. An alkaline storage battery using the hydrogen storage alloy according to claim 2 as a negative electrode,
wherein
the alkaline storage battery is installed in an automobile that has a start-stop function with an engine started by a starter motor and supplies electricity to the starter motor.

8. The hydrogen storage alloy for an alkaline storage battery according to claim 1 , wherein
the hydrogen storage alloy has a particle size D90 on a basis of mass of 8 to 50 m.

9. The hydrogen storage alloy for an alkaline storage battery according to claim 8 , wherein
the hydrogen storage alloy has an alkali-treated layer or an acid-treated layer on a surface.

10. An alkaline storage battery using the hydrogen storage alloy according to claim 8 as a negative electrode,
wherein
the alkaline storage battery is installed in a hybrid electric vehicle having a motor as a driving source and supplies electricity to the motor.

11. An alkaline storage battery using the hydrogen storage alloy according to claim 8 as a negative electrode,
wherein
the alkaline storage battery is installed in an automobile that has a start-stop function with an engine started by a starter motor and supplies electricity to the starter motor.

12. The hydrogen storage alloy for an alkaline storage battery according to claim 1 , wherein
the hydrogen storage alloy has an alkali-treated layer or an acid-treated layer on a surface.

13. An alkaline storage battery using the hydrogen storage alloy according to claim 12 as a negative electrode,
wherein
the alkaline storage battery is installed in a hybrid electric vehicle having a motor as a driving source and supplies electricity to the motor.

14. An alkaline storage battery using the hydrogen storage alloy according to claim 12 as a negative electrode,
wherein
the alkaline storage battery is installed in an automobile that has a start-stop function with an engine started by a starter motor and supplies electricity to the starter motor.

15. An alkaline storage battery using the hydrogen storage alloy according to claim 1 as a negative electrode,
wherein
the alkaline storage battery is installed in a hybrid electric vehicle having a motor as a driving source and supplies electricity to the motor.

16. An alkaline storage battery using the hydrogen storage alloy according to claim 1 as a negative electrode, wherein
the alkaline storage battery is installed in an automobile that has a start-stop function with an engine started by a starter motor and supplies electricity to the starter motor.

Assignees

• Japan Metals And Chemicals Co Ltd
• Toyota Motor Co Ltd

Inventors

• Sawa Takao
• NOTOYAMA Saki
• Terashita Naoyoshi
• Kudo Katsuyuki
• Kon Makio
• Kodama Masashi
• Nishiyama Hiroshi

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/24

  Alkaline accumulators · CPC title

• H01M4/383

  Hydrogen absorbing alloys · CPC title

• H01M4/242

  Hydrogen storage electrodes · CPC title

• B22F1/05

  Metallic powder characterised by the size or surface area of the particles · CPC title