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 register to read the rest. Registered users can access a limited amount of content for free.Subscribers get full access to: Exclusive longform investigative journalism, Q&As, news and analysis, and data on Chinese business elites and corporations. We publish China scoops you won't find anywhere else. A weekly curated reading list on China from David Barboza, Pulitzer Prize-winning former Shanghai correspondent for The New York Times. A daily roundup of China finance, business and economics headlines. We offer discounts for groups, institutions and students. Go to our Subscriptions page for details.