Silicon Valley startup Lilac Solutions has a method to get lithium for batteries that’s cheaper, easier on the environment and less water-intensive than mining: it plans to pull it from the Great Salt Lake.The U.S. could become a major supplier of lithium for batteries in the next few years after the Trump administration took a stake in the developer of a massive mine in Nevada. But Silicon Valley startup Lilac Solutions thinks it’s got a better idea that avoids the higher costs and environmental harms of t ...