EVERY DAY, MILLIONS of lithium-ion batteries roll off the line at Tesla’s Gigafactory in Sparks, Nevada.

These cells, produced on site by Panasonic, are destined to be bundled together by the thousands in the battery packs of new Teslas. But not all the batteries are cut out for a life on the road. Panasonic ships truckloads of cells that don’t pass their qualification tests to a facility in Carson City, about a half hour’s drive south. This is the home of Redwood Materials, a small company founded in 2017 with an ambition to become the anti-Gigafactory, a place where batteries are cooked down into raw materials that will serve as the grist for new cells.

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