The grand opening of Nissan’s new electric car battery plant in Smyrna has been cancelled. A spokesperson for the automaker says scheduling conflicts have been encountered “among key stakeholders.” The plant quietly started producing lithium-ion batteries last month, according to the company. And the first Nissan Leaf made in the U.S. is still supposed to roll off the nearby assembly line around the first of the year. Nissan received a $1.4 billion loan from the federal government to build the battery plant and retool an existing vehicle production line.