Inside the $1 billion race to develop breakthrough batteries that could store up to 40% more energy and revolutionize our phones, cars, and planes

· Lithium-ion batteries will dominate the storage industry for years to come, but there hasn't been a breakthrough in the technology in three decades.  
· Now a group of startups that's raised a total of more than $1 billion is working to bring the next generation of Li-ion batteries to market that are made with silicon...