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A sliver of wood coated with tin could make a tiny, long-lasting, efficient and environmentally friendly battery.
But donít try it at home yet Ė the components in the battery tested by scientists at the University of Maryland are a thousand times thinner than a piece of paper. Using sodium instead of lithium, as many rechargeable batteries do, makes the battery environmentally benign. Sodium doesnít store energy as efficiently as lithium, so you wonít see this battery in your cell phone - instead, its low cost and common materials would make it ideal to store huge amounts of energy at once, such as solar energy at a power plant.
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