Several state officials and auto makers are pillorying Volkswagen AG’s plan to sell battery juice to Americans driving electric cars, contending the project more resembles an unfair government-backed windfall than penance for cheating on emissions tests. The German auto giant will build an extensive network of charging stations in the U.S. in coming years, part of a $2 billion, decade-long promotion of environmentally friendly transportation in a market where electric cars are unpopular. The commitment is part of a…