Hydrogen absorption alloy, hydrogen absorption alloy electrode, and secondary battery

Patent metadata

Field	Value
Publication number	US-9450238-B2
Application number	US-201113580587-A
Country	US
Kind code	B2
Filing date	Mar 25, 2011
Priority date	Mar 29, 2010
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

The present invention provides a hydrogen absorption alloy, which includes chemical composition represented by the general formula M1 t M2 u M3 v Ca w Mg x Ni y M4 z wherein 16×(d−1.870)/(d−r)≦v≦16×(d−1.860)/(d−r); 1.6≦w≦3.2; 4.1≦×≦5.1; 3.2≦(y+z)/(t+u+v+w+x)≦3.4; t +u+v+w+x+y+z=100; M1 is one or more elements selected from La, Pr, and Nd; M2 is one or more elements selected from V, Nb, Ta, Ti, Zr, and Hf; M3 is one or more elements selected from Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; M4 is one or more elements selected from Co, Mn, Al, Cu, Fe, Cr, and Zn; d is an average atomic radius of the elements selected as M1; and r is an average atomic radius of the elements selected as M3; and an electrode and a secondary battery using the same.

First claim

The invention claimed is:

1. A hydrogen absorption alloy, comprising chemical composition represented by a formula M1 t M2 u M3 v Ca w Mg x Ni y M4 z
wherein 16×(d−1.870)/(d−r)≦v ≦16×(d−1.860)/(d−r);
1.9≦w≦3.2;
4.1≦x≦5.1;
3.2≦(y+z)/(t+u+v+w+x) ≦3.4;
t+u+v+w+x+y+z=100;
M1 is one or more elements selected from La, Pr, and Nd;
M2 is one or more elements selected from V, Nb, Ta, Ti, Zr, and Hf;
M3 is Sm;
M4 is one or more elements selected from Co, Mn, Al, Cu, Fe, Cr, and Zn;
d is an average atomic radius of the elements selected as M1;
r is an atomic radius of Sm; and
a ratio of Sm to the entire hydrogen absorption alloy is 1.6 atomic % or more and 3.5 atomic % or less.

2. The hydrogen absorption alloy according to claim 1 , which is constituted such that v satisfies 0.5 ≦v≦3.7.

3. The hydrogen absorption alloy according to claim 1 , which is constituted such that v satisfies 1.6 ≦v≦3.5.

4. The hydrogen absorption alloy according to claim 1 , wherein a crystal phase having a Ce 2 Ni 7 type crystal structure is a main generated phase.

5. A hydrogen absorption alloy electrode, comprising using the hydrogen absorption alloy according to claim 1 as a hydrogen storage medium.

6. A secondary battery, comprising using the hydrogen absorption alloy electrode according to claim 5 as a negative electrode.

7. A hydrogen absorption alloy, comprising chemical composition represented by a formula M1 t M2 u M3 v Ca w Mg x Ni y M4 z M5 s
wherein 16×(d −1.870)/(d −r)≦v≦16×(d −1.860)/(d −r);
1.9≦w≦3.2;
4.1≦x≦5.1;
3.2≦(y+z)/(t+u+v+w+x)≦3.4;
t+u+v+w+x+y+z=100;
s is in a range of 0<s≦0.4;
M1 is one or more elements selected from La, Pr, and Nd;
M2 is one or more elements selected from V, Nb, Ta, Ti, Zr, and Hf;
M3 is Sm;
M4 is one or more elements selected from Co, Mn, Al, Cu, Fe, Cr, and Zn;
M5 is an element other than M1, M2, M3and M4;
d is an average atomic radius of the elements selected as M1;
r is an atomic radius of Sm; and
a ratio of Sm to the entire hydrogen absorption alloy is 1.6 atomic % or more and 3.5 atomic % or less.

8. The hydrogen absorption alloy according to claim 7 , which is constituted such that v satisfies 0.5≦v≦3.7.

9. The hydrogen absorption alloy according to claim 7 , which is constituted such that v satisfies 1.6≦v≦3.5.

10. The hydrogen absorption alloy according to claim 7 , wherein a crystal phase having a Ce 2 Ni 7 type crystal structure is a main generated phase.

11. A hydrogen absorption alloy electrode, comprising using the hydrogen absorption alloy according to claim 7 as a hydrogen storage medium.

12. A secondary battery, comprising using the hydrogen absorption alloy electrode according to claim 11 as a negative electrode.

Assignees

• Ozaki Tetsuya
• Kanemoto Manabu
• Kawabe Yoshiteru
• Kakeya Tadashi
• Gs Yuasa Int Ltd

Inventors

• Ozaki Tetsuya
• Kanemoto Manabu
• Kawabe Yoshiteru
• Kakeya Tadashi

Classifications

• Y02E60/124

  Cross-Sectional Technologies · mapped topic

• C22C1/0441

  Alloys based on intermetallic compounds of the type rare earth - Co, Ni · CPC title

• C01B3/0057

  and nickel · CPC title

• H01M4/383 Primary

  Hydrogen absorbing alloys · CPC title

• C01B3/0047

  containing a rare earth metal · CPC title