Imagine an electric aircraft that can be refueled like any other, not with aviation gasoline or kerosene, but with energy-storing fluids that can be recharged after each flight. The fluids are immune to thermal runaway and the risk of fire that comes with lithium-ion (Li-ion) batteries. That is the promise of an early-stage rechargeable liquid battery technology under investigation by NASA. The agency is researching the integration of nano-electrofuel (NEF) flow batteries with rim-driven ...

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