Mercedes-Benz’s newest electric city bus uses solid-state batteries

Lithium-ion battery technology has made impressive gains over the years. Today’s cells are cheaper than they’ve ever been, but lithium-ion still leaves a lot to be desired in terms of energy density compared to liquid hydrocarbon fuels. Which means that putting enough of them in a car to give it an acceptable range adds a lot of mass and volume. Which is where solid-state batteries come in.

In a traditional battery, a pair of electrodes are immersed in an electrolyte solution, and it’s this liquid electrolyte that allows ions to

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