The material in question is called Aluminum-Celmet that features an Aero bar-like, three-dimensional mesh-like structure that forms interconnected, open and spherical pores. Sumitomo Electric had previously been producing its proprietary Celmet material made from nickel or nickel chrome alloy. Its high porosity of up to 98 percent and favorable filling, retaining and current-collecting performance when used with an active material, led to Celmet recently being adopted as a positive electrode current collector in hybrid vehicle nickel-hydrogen batteries. It is also easy to process the porous metal into various shapes by cutting and stamping.
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