Pass the Salt, Please

Researchers Develop Thin-Film Battery From Paper, Salt.

Technology Review (9/15) reports, “Researchers at Uppsala University in Sweden have made a flexible,” lightweight rechargeable battery that “uses thin pieces of paper–pressed mats of tangled cellulose fibers–for electrodes, while a salt solution acts as the electrolyte.” The researchers say “the new battery should be cheap, easy to manufacture, and environmentally benign,” and suggest “that it might be used to power cheap medical diagnostics devices or sensors on packaging materials or embedded into fabric.” Currently, the battery “delivers 1 volt and can store up to 25 milliwatt-hours of energy per gram,” and “when providing maximum current, it loses 6 percent of its storage capacity after 100 recharging cycles.” Lead researcher Maria Stromme noted, however, “that these are numbers from an initial laboratory prototype.”

From the ASEE “First Bell” for September 15, 2009.  All rights reserved.

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