In 2021, Qichao Hu began planning a pilot factory in South Korea to produce next-generation electric vehicle batteries for the startup he founded, SES AI, when a debate erupted among his staff scientists: Should the plant include explosion-proof bunkers? Some of the scientists argued that such fortifications were a waste of money—ordinarily the lithium-metal batteries they were developing were quite dangerous, but they had tamed the technology, leaving little risk of fires or explosions.
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