Sales of electric vehicles nearly doubled in 2013, but most won’t take you farther than 100 miles on one charge. To boost their range toward a tantalizing 300 miles or more, researchers are reporting progress on a “breathing” battery that has the potential to one day replace the lithium-ion technology of today’s EVs. They presented their work at the 247th National Meeting & Exposition of the American Chemical Society, the world’s largest scientific society.