Aluminum Celmet Batteries

Celmet (cell+metal) is a porous, metallic mesh that is conductive and can store electric charge. Sumitomo Electric (SEI) has previously produced celmet using nickel based alloys, but now is producing an aluminum version that can triple the capacity of current lithium-ion batteries. This could also allow the creation of smaller and lighter batteries.

Development of Porous Aluminum “Aluminum-Celmet” – [global-sei.com]

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.

Boffins triple battery life with metal foam – [theregister.co.uk]

Japanese researchers have developed a new material they estimate can triple the capacity of lithium-ion batteries.

The breakthrough comes courtesy of Sumitomo Electric Industries, which has set up a “small-scale production line” at its Osaka Works R&D center to produce the battery-boosting material, which they call “Aluminum-Celmet”.
Sumitomo Electric’s ‘Aluminum-Celmet’ material

What gives Aluminum-Celmet its ability to be the basis of highly efficient batteries is its extreme porosity – up to 98 per cent. When used as a replacement for the aluminum foil anode in a secondary – rechargeable – lithium-ion battery, that porosity allows for the battery to contain a significantly larger amount of the lithium compound that contributes its ions to the electrical flow.

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