The world's carmakers are maneuvering toward an electric future, but China’s grip on the precious minerals vital to the new vehicles may spark another revolution: a race to retrieve and recycle batteries. General Motors announced in January that it plans a major switch to electric vehicles, in a bid to compete with Tesla, the world’s most valuable car company, as well as Nio, a Chinese EV startup whose stock market value is now equal to GM. All want the best technology to persuade consume