Rare earth based hydrogen storage alloy and application thereof

• US 10,566,614 B2
• Filed: 08/27/2015
• Issued: 02/18/2020
• Est. Priority Date: 08/28/2014
• Status: Active Grant

• Current Assignee: Baotou Research Institute of Rare Earths, National Engineering Research Centre of Rare Earth Metallurgy and Functional Materials Co., Ltd., Tianjin Baogang Research Institute of Rare Earths Co., Ltd.
• Original Assignee: Baotou Research Institute of Rare Earths
• Inventors: Yan, Huizhong, Wang, Li, Xiong, Wei, Li, Baoquan, Li, Jin
• Primary Examiner(s): Nassiri-Motlagh, Anita
• Application Number:
  US15/507,133
• Publication Number:
  US 20170288217A1
• Time in Patent Office: 1,636 Days
• Field of Search: None
• CPC Class Codes: C22C 1/023 Alloys based on nickel
• CPC Class Codes: C22C 19/007 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 Class Codes: C22C 19/03 based on nickel
• CPC Class Codes: C22C 2202/04 Hydrogen absorbing
• CPC Class Codes: C22C 28/00 Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 4/383 Hydrogen absorbing alloys
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

The invention relates to a rare earth based hydrogen storage alloy, represented by the general formula (I):
RE_xY_yNi_z-a-b-cMn_aAl_bM_cZr_ATi_B  (I)
wherein RE denotes one or more element(s) selected from La, Ce, Pr, Nd, Sm, Gd; M denotes one or more element(s) selected from Cu, Fe, Co, Sn, V, W. The alloy has favorable pressure-composition-temperature characteristic, high hydrogen storage capacity, high electrochemical capacity. The alloy doesn'"'"'t contain magnesium element, and the preparation process of the alloy is easy and safe.

Claims

1. A rare earth based hydrogen storage alloy represented by the general formula (I):

RE_xY_yNi_z-a-b-cMn_aAl_bM_cZr_ATi_B 

 

(I)

wherein RE denotes one or more element(s) selected from the group consisting of La, Ce, Pr, Nd, Sm, and Gd;

M denotes one or more element(s) selected from the group consisting of Cu, Fe, Co, Sn, V, and W;

x>

0, y≥

0.5, and x+y=3, 13≥

z≥

7;

6≥

a+b>

0, 5≥

c≥

0, and 4≥

A+B≥

0.

2. The rare earth based hydrogen storage alloy according to claim 1, wherein x>

0, y≥

0.5, x+y=3;

12.5≥

z≥

8.5;

5.5≥

a+b>

0, 3.5≥

c≥

0, and 2.5≥

A+B≥

0.

3. The rare earth based hydrogen storage alloy according to claim 2, wherein c=0 and A=B=0.

4. The rare earth based hydrogen storage alloy according to claim 3, wherein 12.5≥

z≥

11.

5. The rare earth based hydrogen storage alloy according to claim 3, wherein 11>

z≥

9.5; and

4.5≥

a+b>

0.

6. The rare earth based hydrogen storage alloy according to claim 3, wherein 9.5>

z≥

8.5; and

3.5≥

a+b>

0.

7. The rare earth based hydrogen storage alloy according to claim 2, wherein A=B=0, and c>

0.

8. The rare earth based hydrogen storage alloy according to claim 7, wherein 3.5≥

a+b≥

0; and

3.0≥

c>

0.

9. The rare earth based hydrogen storage alloy according to claim 2, wherein 2.5≥

A+B>

0.

10. The rare earth based hydrogen storage alloy according to claim 9, wherein 12.5≥

z≥

11, and 4≥

a+b>

0.

11. The rare earth based hydrogen storage alloy according to claim 9, wherein 11>

z≥

9.5;

3.5≥

a+b>

0; and

3≥

c≥

0.

12. The rare earth based hydrogen storage alloy according to claim 9, wherein 9.5>

z≥

8.5;

3≥

a+b>

0; and

2.5≥

c≥

0.

13. The rare earth based hydrogen storage alloy according to claim 1, wherein one or more of the following items i)-iv) apply:

i) 2.0≥

x≥

0.5;

ii) 3.0≥

a≥

0.5;

iii) 1.5≥

b≥

0.3;

iv) z=11.4.

14. The rare earth based hydrogen storage alloy according to claim 1, wherein one or more of the following items i)-iv) apply:

i) 2.0≥

x≥

0.5;

ii) 2.5≥

a≥

0.5;

iii) 1.0≥

b≥

0.2;

iv) z=10.5.

15. The rare earth based hydrogen storage alloy according to claim 1, wherein one or more of the following items i)-iv) apply:

i) 2.0≥

x≥

0.5;

ii) 2.0≥

a≥

0.5;

iii) 1.0≥

b≥

0.2;

iv) z=9.

16. The rare earth based hydrogen storage alloy according to claim 1, wherein one or more of the following items i)-v) apply:

i) 2.0≥

x≥

0.5;

ii) 2.0≥

a≥

0.5;

iii) 1.0≥

b≥

0.3;

iv) 11.4≥

z≥

9;

v) 2.5≥

c≥

0.1.

17. The rare earth based hydrogen storage alloy according to claim 1, wherein one or more of the following items i)-vii) apply:

i) 2≥

x≥

0.5;

ii) 2.5≥

a≥

0.5;

iii) 1.0≥

b≥

0.2;

iv) z=11.4;

v) 2.5≥

c≥

0.1;

vi) 1.0≥

A≥

0.1;

vii) 1.0≥

B≥

0.1.

18. The rare earth based hydrogen storage alloy according to claim 1, wherein one or more of the following items i)-vii) apply:

i) 2.0≥

x≥

0.5;

ii) 2.0≥

a≥

0.5;

iii) 1.0≥

b≥

0.2;

iv) z=10.5;

v) 2.0≥

c≥

0.1;

vi) 1.0≥

A≥

0.1;

vii) 1.0≥

B≥

0.1.

19. The rare earth based hydrogen storage alloy according to claim 1, wherein one or more of the following items i)-vii) apply:

i) 2.0≥

x≥

0.5;

ii) 2.0≥

a≥

0.5;

iii) 1.0≥

b≥

0.2;

iv) z=9;

v) 2.0≥

c≥

0.1;

vi) 1.0≥

A≥

0.1;

vii) 1.0≥

B≥

0.1.

20. The rare earth based hydrogen storage alloy according to claim 1, wherein one or more of the following items i)-iii) apply:

i) the alloy has a maximum hydrogen storage capacity of 1.2-1.5 wt % at 313K;

ii) when utilized as a negative material electrode for a Ni-MH battery, the alloy has a maximum discharge capacity of 300-400 mAh/g at a current density of 70 mA/g;

iii) the alloy has a capacity retention of more than 85%, at a current density of 70 mA/g.

21. A hydrogen storage medium comprising the rare earth based hydrogen storage alloy according to claim 1.

22. An electrode of a secondary battery comprising the rare earth based hydrogen storage alloy according to claim 1.

23. A secondary battery comprising the rare earth based hydrogen storage alloy according to claim 1.