A maker of lithium-ion batteries whose anodes are made almost entirely of silicon rather than the traditional graphite, giving them higher energy density for use in smartphones, laptops, and electric vehicles. Founded in 2007 in Fremont, California, by three veterans of the semiconductor and data-storage industries, the company treats battery design like chip manufacturing: it stacks the battery's layers vertically instead of rolling them up, which lets silicon expand during charging without failing. That flat, stackable design also hints at the company's name, which evokes "energy" and the precision of electronics.
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