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The New York Times has a nice write-up on Billerica’s Factorial Energy, founded by a husband-wife team from China who are in a race to develop the first workable solid-state battery that could transform the electric-car industry. … The firm has received nearly $250 million in funding over the years, including investments by Mercedes-Benz, as the BBJ has reported. The Globe has previously named the firm’s cofounder and chief executive, Siyu Huang, as a  local Tech Power Player. … Image above via Factorial Energy.