Share this on Twitter Share this on Facebook Share this on LinkedIn Share this on Sina Weibo Share this on Wechat Share this on LinkedIn Illustration by Sam Ward Tesla’s “Battery Day” in Fremont, California, this past September felt like Lollapalooza for energy nerds. As record-breaking wildfires burned just six miles away, underscoring Tesla’s mission to rid the world of climate change-causing fossil fuels, the electric vehicle company organized an hour-long celebration of lithium-ion batteries — one of a handful of technological breakthroughs that have made low carbon policies possible. On a giant outdoor stage, Elon Musk, Tesla’s co-founder and chief executive and Drew Baglino, a senior vice president, wore black t-shirts with a close-up image of Tesla’s new battery structure as they waxed poetic about the chemistry of lithium ion batteries. With energy-dense, durable and versatile cells, the nearly 50-year-old lithium ion battery now powers everything from laptops and smartphones to electric vehicles. The battery’s inventors — John B. Goodenough, M. Stanley Whittingham and Akira Yoshino — even won the Nobel PriSubscribe or log in to read the rest.