The provider of the batteries for Airbus’ record-breaking Zephyr solar-powered stratospheric unmanned aircraft says it is working with electric vertical-takeoff-and-landing (eVTOL) developers on application of its high energy-density lithium-ion cells. Where conventional lithium-ion batteries have graphite anodes and an energy density of 300-320 Wh/kg at best, Amprius’ cells use a silicon nanowire anode and have a specific energy of 435 Wh/kg. “That’s an enormous ...


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