Executives from General Motors Co. (NYSE: GM), South Korea-based LG Energy Solution and Gov. Bill Lee will make “an economic development announcement” at 2:30 p.m. Friday at the Tennessee State Museum, according to media advisories for the event. The announcement pertains to the Ultium Cells LLC electric vehicle battery plant now being built in Spring Hill, about 35 miles south of Nashville, on GM’s campus in Maury County.