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Solid Power’s 22-layer, 20Ah all solid-state lithium metal cell compared to the company’s first-generation 10-layer, 2Ah cell. Photo: © Solid Power For the whole of the 140-year history of automotive batteries, researchers and their bosses have tended to secrecy. Even when forced to say something as a requirement of government or private funding, the default has been half-truths, and sometimes less. The main reason for all the hiding has been sincere: Batteries are hard and victories over the physics rare; usually you have nothing great to tell, and when you do, you want to hold it close...

A new paper has claimed up to a 25% capacity loss Lithium in its pure extracted state in evaporation ponds at Uyuni Salt Flat, Bolivia. Photo: Pablo Cozzaglio/AFP/Getty For years, they were the Don Quixotes of the battery world — tinkerers in pure lithium metal romantically seeking to install them in batteries, only to find them catching fire and the answers they thought would fix them a mirage. Then, over the last six months, these People of La Mancha became the toast of Silicon Valley and Wall Street, winning high-dollar valuations in SPAC deals and courted by virtually every major aut...