General Motors Co and South Korea’s POSCO Chemical will build a $400 million facility to produce battery materials in Canada as the carmaker ramps up plans to produce mainly electric vehicles (EVs) in the future, the companies said on Monday. The plant will produce cathode active material (CAM) for vehicle batteries in Becancour, Quebec. Cathodes are the most complex and costly chemical component of an electric vehicle battery. The cathode “represents about 40percent of the cost of every EV battery cell,” said Scott Bell, GM Canada’s President and Managing Director, in a news conference. “We plan to have capacity by 2025 to build a million EVs in North America.” The plant’s construction will begin immediately and the goal is to have it running by 2025. Once completed, it will create an estimated 200 jobs, according to a statement. GM aims to produce light vehicles that run exclusively on electricity by …