Researchers have long had high hopes for lithium-air batteries, a device that has the potential to store 10 times more energy than the best lithium-ion batteries on the market today. But so far, lithium-air batteries have been unstable, falling apart after a few charges. Now researchers report that they’ve made the first stable lithium-air batteries. If the batteries can leap other hurdles needed to make them practical, they may one day give electric cars a driving range similar to today’s gas guzzlers.
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