Lithium miners are bulking up for a booming future when electric cars go mainstream. But speed bumps loom, with prices tumbling on a burst of new production and demand growth slowing in China. Between mid-2015 and mid-2018, prices for lithium, the soft, silvery-white metal crucial for rechargeable batteries, almost tripled as the world’s fleet of electric vehicles hit the 5 million mark, and the auto industry began to fret over the supply of raw materials.
