Metal porous body and current collector for nickel-metal hydride battery

Patent metadata

Field	Value
Publication number	US-11271215-B2
Application number	US-201816627830-A
Country	US
Kind code	B2
Filing date	Jul 11, 2018
Priority date	Jul 18, 2017
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A metal porous body is a metal porous body mainly composed of nickel and having a framework of a three-dimensional network structure, Ni(OH)2 being present in a surface of the framework, when the metal porous body is subjected to at least 30 potential scans between a lower limit potential of −0.10 V and an upper limit potential of +0.65 V with respect to a hydrogen standard potential in not less than 10% by mass and not more than 35% by mass of a potassium hydroxide aqueous solution, at least oxygen being detected within a depth of 5 nm from the surface, and hydrogen being detected at least in the surface.

First claim

The invention claimed is:

1. A metal porous body mainly composed of nickel and having a framework of a three-dimensional network structure,
Ni(OH) 2 being present in a surface of the framework,
when the metal porous body is subjected to at least 30 potential scans between a lower limit potential of −0.10 V and an upper limit potential of +0.65 V with respect to a hydrogen standard potential in not less than 10% by mass and not more than 35% by mass of a potassium hydroxide aqueous solution, at least oxygen being detected within a depth of 5 nm from the surface, and hydrogen being detected at least in the surface.

2. The metal porous body according to claim 1 , wherein
a content of NiO is lower than a content of Ni in the surface.

3. The metal porous body according to claim 1 , wherein
a content of a combined total of Ni 2 O 3 and Ni(OH) 2 is higher than a content of NiO in the surface.

4. The metal porous body according to claim 1 , wherein
the oxygen is detected by analyzing the surface in a depth direction of the framework using Auger electron spectroscopy (AES).

5. The metal porous body according to claim 1 , wherein
Ni, NiO, Ni 2 O 3 , and Ni(OH) 2 are detected by analyzing the surface using X-ray photoelectron spectroscopy (XPS).

6. The metal porous body according to claim 5 , wherein
a peak of the NiO is absent in a spectrum of a 1s orbital of O, and area sizes of peaks of the Ni, the NiO, the Ni 2 O 3 , and the Ni(OH) 2 satisfy a relational equation of Ni>a total of Ni 2 O 3 and Ni(OH) 2 >NiO in a spectrum of three orbitals in 2p of the Ni.

7. The metal porous body according to claim 1 , wherein
the hydrogen is detected as water desorbed from the metal porous body at a temperature higher than an evaporation temperature of water adsorbed on the surface, by analyzing the surface using thermal desorption spectrometry (TDS).

8. The metal porous body according to claim 1 , wherein
the Ni(OH) 2 is detected as a binding energy-derived peak corresponding to the Ni(OH) 2 by analyzing the surface using X-ray photoelectron spectroscopy (XPS), and
the hydrogen is detected as water desorbed from the metal porous body at a temperature higher than an evaporation temperature of water adsorbed on the surface, by analyzing the surface using thermal desorption spectrometry (TDS).

9. A current collector for a nickel-metal hydride battery including the metal porous body as recited in claim 1 .

10. A current collector for a nickel-metal hydride battery including a metal porous body, the metal porous body being mainly composed of nickel and having a framework of a three-dimensional network structure,
Ni(OH) 2 being present in a surface of the framework,
at least oxygen being detected within a depth of 5 nm from the surface.

Assignees

• Sumitomo Electric Industries
• Sumitomo Electric Toyama Co
• Primearth Ev Energy Co Ltd

Inventors

• Okuno Kazuki
• Majima Masatoshi
• Tsuchida Hitoshi
• Nishimura Junichi
• Kimura Koutarou
• Shimizu Yusuke

Classifications

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M4/80 Primary

  Porous plates, e.g. sintered carriers · CPC title

• H01M10/345

  Gastight metal hydride accumulators · CPC title

• H01M4/661 Primary

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• C25D1/08

  Perforated or foraminous objects, e.g. sieves (C25D1/10 takes precedence) · CPC title