Method for producing a porous metal body

Patent metadata

Field	Value
Publication number	US-10164262-B2
Application number	US-201615374251-A
Country	US
Kind code	B2
Filing date	Dec 9, 2016
Priority date	Dec 8, 2010
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

Provided are a porous metal body that is excellent in terms of corrosion resistance and that is suitable for a collector for batteries such as lithium-ion batteries, capacitors, or fuel cells; and methods for producing the porous metal body. A production method includes a step of coating a porous nickel body with an alloy containing at least nickel and tungsten or a metal containing at least tin; and a subsequent step of a heat treatment. Another production method includes a step of forming a nickel-plated layer on a porous base and then continuously forming an alloy-plated layer containing at least nickel and tungsten or tin, a step of removing the porous base, and a step of reducing metal. Such a method can provide a porous metal body in which tungsten or tin is diffused in a porous nickel body or a nickel-plated layer.

First claim

The invention claimed is:

1. A method for producing a porous metal body containing an alloy containing at least nickel and tin, the method comprising a step of coating a porous nickel body with a metal containing at least tin; and a step of subsequently performing a heat treatment to diffuse tin into the porous nickel body;
the porous metal body has a metal composition containing 1 mass % or more and 58 mass % or less of tin,
the tin concentration ratio between the exterior and interior of a porous metal skeleton, that is, the exterior concentration/interior concentration is in the range of 2/1 to ½,
wherein the porous metal body has an average pore size of 50 μm or more and 1000 μm or less, and
wherein a total metal coating weight of the porous metal body is 200 g/m 2 or more and 1000 g/m 2 or less.

2. The method for producing a porous metal body according to claim 1 , wherein the porous nickel body is obtained by coating, with nickel, a porous base having been made electrically conductive, removing the porous base, and subsequently reducing nickel.

3. The method for producing a porous metal body according to claim 1 , wherein the exterior concentration/interior concentration is in the range of 3/2 to ⅔.

4. The method for producing a porous metal body according to claim 1 , wherein the exterior concentration/interior concentration is in the range of 4/3 to ¾.

5. The method for producing a porous metal body according to claim 1 , wherein a porosity of the porous metal body is 60% or more and 97% or less.

Assignees

• Sumitomo Electric Industries
• Sumitomo Electric Toyama Co

Inventors

• Okuno Kazuki
• Kato Masahiro
• Majima Masatoshi
• Awazu Tomoyuki
• Saito Hidetoshi
• Nishimura Junichi
• Shiraishi Keiji
• Tsuchida Hitoshi
• Tsukamoto Kengo

Classifications

• C22C19/03 Primary

  based on nickel · CPC title

• B32B15/01

  all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)} · CPC title

• C25D3/30

  of tin · CPC title

• Y02P70/56

  Cross-Sectional Technologies · mapped topic

• C23F17/00

  Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25 (coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups C23C2/00 - C23C26/00, or by combinations of methods providedfor in subclasses C23C and C25D, C23C28/00) · CPC title