Volkswagen, the German auto giant, is preparing for a swift expansion in its output of electric cars next year — and the biggest jump in production will be in China. General Motors is making China the hub of its electric car research and development. Renault-Nissan , the French and Japanese carmaker, and Ford Motor have hustled to set up joint electric-car ventures in China. Global automakers see the future of electric cars, and it looks Chinese. The biggest players are shifting crucial scientific and design work to China as the country invests heavily in car-charging stations and research and pushes automakers to embrace battery-powered vehicles. China underscored that ambition over the weekend, when it said it would eventually ban the sale of gasoline- and diesel-powered cars at an […]