Blogger Themes

Tuesday, 19 July 2011

Development of Porous Aluminum “Aluminum-Celmet”

Sumitomo Electric Industries
June 24, 2011
Sumitomo Electric Industries, Ltd., having newly developed its porous aluminum “Aluminum-Celmet,” has set up a small-scale production line at Osaka Works (1-1-3 Shimaya, Konohana-ku, Osaka) to accelerate development efforts toward mass production of the new material.

Celmet is a porous metal made from nickel or nickel chrome alloy. The porous metal manufacturing process comprises electro conductive coating to plastic foam, followed by nickel plating and plastic foam removal by heat treatment.

Celmet’s features include high porosity (up to 98%), considerably higher than other porous metals, such as nonwoven metal fabric and foam metal; it also features a three-dimensional mesh-like structure that forms interconnected, open and spherical pores. Moreover, it is easy to process the porous metal into various shapes by cutting and stamping.

These features lead to favorable filling, retaining and current-collecting performance, when used with an active material. As such, Celmet has recently been adopted as a positive electrode current collector in hybrid vehicle nickel-hydrogen batteries.

We have recently succeeded in developing porous aluminum Aluminum-Celmet, using processes similar to those used for producing nickel Celmet.

In addition to sharing the high porosity feature of Celmet, Aluminum-Celmet offers lightness (the specific gravity of aluminum is about one-third that of nickel) and greater electrical conductivity (or low electrical resistivity, less than half that of nickel). Furthermore, Aluminum-Celmet offers excellent corrosion resistance. These features make it suitable for use in lithium-ion and other secondary batteries operating at high charge/discharge voltages, for which Celmet made from nickel is not suitable. Aluminum-Celmet can also be used for current collectors in capacitors.


Post a Comment