High pressure type hydride secondary battery

Patent metadata

Field	Value
Publication number	US-2018083324-A1
Application number	US-201715703121-A
Country	US
Kind code	A1
Filing date	Sep 13, 2017
Priority date	Sep 16, 2016
Publication date	Mar 22, 2018
Grant date	—

Abstract

A hydride secondary battery includes: a pressure vessel; a positive electrode disposed in the pressure vessel; a negative electrode disposed in the pressure vessel; and hydrogen gas with which the pressure vessel is filled. The negative electrode contains a hydrogen-absorbing alloy. In a pressure-composition-temperature diagram, a desorption curve at 25° C. of the hydrogen-absorbing alloy has a plateau pressure of 0.15 MPa or more and 10 MPa or less. The hydrogen gas has a pressure equal to or higher than the plateau pressure at 25° C. of the hydrogen-absorbing alloy.

First claim

What is claimed is:

1 . A hydride secondary battery comprising:
a pressure vessel; a positive electrode disposed in the pressure vessel; a negative electrode disposed in the pressure vessel; and hydrogen gas with which the pressure vessel is filled, wherein the negative electrode contains a hydrogen-absorbing alloy, and in a pressure-composition-temperature diagram, a desorption curve at 25° C. of the hydrogen-absorbing alloy has a plateau pressure of 0.15 MPa or more and 10 MPa or less, and wherein the hydrogen gas has a pressure equal to or higher than the plateau pressure at 25° C. of the hydrogen-absorbing alloy.

2 . The hydride secondary battery according to claim 1 , wherein the desorption curve at 25° C. of the hydrogen-absorbing alloy has a plateau pressure of 0.15 MPa or more and 5 MPa or less.

3 . The hydride secondary battery according to claim 1 , wherein the desorption curve at 25° C. of the hydrogen-absorbing alloy has a plateau pressure of 0.3 MPa or more and 2.3 MPa or less.

4 . The hydride secondary battery according to claim 1 , wherein the hydrogen-absorbing alloy is at least one selected from the group consisting of a AB 5 type alloy expressed by MmNi 5-x1 B x1 , provided that Mm represents a mischmetal, B represents at least one selected from the group consisting of Fe, Cr, Mn, and Al, and x1 is 0 or more and 0.6 or less, a AB 5 type alloy expressed by MmNi 5-x2 Co x2 , provided that Mm represents a mischmetal and x2 is more than 0 and 1.0 or less, and LaNi 5 .

5 . The hydride secondary battery according to claim 1 , wherein the hydrogen-absorbing alloy is at least one selected from the group consisting of
an AB 5 type alloy expressed by MmNi 5-x3 Fe x3 , provided that Mm represents a mischmetal and x3 is 0.2 or more and 0.4 or less, an AB 5 type alloy expressed by MmNi 5-x4 Cr x4 , provided that Mm represents a mischmetal and x4 is 0.4 or more and 0.6 or less, an AB 5 type alloy expressed by MmNi 5-x5 Co x5 , provided that Mm represents a mischmetal and x5 is 0.7 or more and 0.9 or less, an AB 5 type alloy expressed by MmNi 5-x6 Mn x6 , provided that Mm represents a mischmetal and x6 is 0.4 or more and 0.6 or less, an AB 5 type alloy expressed by MmNi 5-x7 Al x7 , provided that Mm represents a mischmetal and x7 is 0.4 or more and 0.6 or less, and an AB 5 type alloy expressed by MmNi 5-x8-y8 Cr x8 Mn y8 , provided that Mm represents a mischmetal, x8 is 0.25 or more and 0.45 or less, y8 is 0.05 or more and 0.25 or less, and a sum of x8 and y8 is 0.5.

6 . The hydride secondary battery according to claim 1 , wherein the hydrogen-absorbing alloy is at least one selected from the group consisting of MmNi 5 , MmNi 4.7 Fe 0.3 , MmNi 4.5 Cr 0.5 , MmNi 4.2 Co 0.8 , MmNi 4.5 Mn 0.5 , MmNi 4.5 Al 0.5 , MmNi 4.5 Cr 0.45 Mn 0.05 , and MmNi 4.5 Cr 0.25 Mn 0.25 , provided that Mm represents a mischmetal.

7 . The hydride secondary battery according to claim 4 , wherein the hydrogen-absorbing alloy has a hydrogen absorption amount of 1.3 mass % or more and 1.5 mass % or less.

8 . The hydride secondary battery according to claim 1 , wherein the hydrogen gas has a pressure at 25° C. of 10 MPa or more and 70 MPa or less.

9 . The hydride secondary battery according to claim 1 , wherein the positive electrode contains at least one of nickel oxyhydroxide and nickel hydroxide.

Assignees

• Toyota Motor Co Ltd
• Univ Hiroshima

Inventors

• Nakanishi Haruyuki
• Kojima Yoshitsugu
• Ichikawa Takayuki
• Miyaoka Hiroki

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/30

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

• H01M2004/028

  Positive electrodes · CPC title

• C01B3/0031

  Intermetallic compounds; Metal alloys · CPC title

• H01M4/242

  Hydrogen storage electrodes · CPC title