Simple mathematical formula models lithium-ion battery aging

Hybrid electric vehicles, cell phones, digital cameras, and the Mars Curiosity rover are just a few of the many devices that use rechargeable lithium-ion batteries. Now a team of Penn State researchers has a simple mathematical ...

Audi to unveil rival to Tesla X at Frankfurt Auto Show

German carmaker Audi says it's planning to unveil an electric sport SUV concept with a range of over 310 miles (500 kilometers)—well beyond the range of rival carmaker Tesla's Model S and soon-to-launch Model X.

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