Group14 Technologies, a developer of materials that enhance the output of lithium-silicon batteries, raised $400 million in Series C funding. Porsche AG led the round with OMERS Capital Markets, Decarbonization Partners, Riverstone, Vsquared Ventures, Moore Strategic Ventures, and other institutional investors. Group14 said the new funds would enable the company to begin constructing its second plant in the U.S. According to the company, the materials it supplies help boost lithium-silicon batteries by 50% compared to traditional lithium-ion batteries. The company said that more automakers would be turning to lithium-silicon because it is compatible with existing manufacturing processes.