Flat Battery: It Works On Paper


FLAT OUT: The SoftBattery works the same way as ordinary AA batteries — but it uses paper as its conduit

If saving bits of energy and environment here and there add up, then Finland's Enfucell has a battery that will help people make a difference by cutting down on all the metal, lithium and alkaline that leaks from conventional cells. "Our battery doesn't have to go to the battery-recycle bin. It's disposable as household waste," says Jaako Happonen, 50, Enfucell's chief executive.

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Enfucell, based outside Helsinki, builds batteries out of paper. Its SoftBattery works much the same way as ordinary "button" batteries (like the one in your watch) and "finger" batteries (think AA). Ions travel from an anode,...

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