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The advanced battery market has seen many companies stumble in recent years. Startups with promising technologies for storing renewable energy or powering electric cars failed to find customers quickly enough (see “Why We Don’t Have Battery Breakthroughs”). But Sakti3, the maker of a novel solid-state battery, got a big boost this year when the British appliance giant Dyson said it would invest $15 million in the company and incorporate Sakti3’s batteries into its products. Because it dispenses with the liquid electrolytes used in most batteries, which can cause chemical reactions that lead to overheating, a solid-state battery doesn’t require bulky cooling systems and thus can deliver the same amount of energy in a much smaller package. Given that this could lead to electric cars with longer ranges than the ones available today, Sakti3—one of this year’s 50 Smartest Companies—also counts General Motors as an investor. Founder Ann Marie Sastry spoke to MIT Technology Review’s senior editor for energy, Richard Martin.

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