Batteries are nearing their limits in terms of how much power they can store for a given weight. That's a serious obstacle ...

Engineers developed a fuel cell that offers more than three times as much energy per pound compared to lithium-ion batteries. Powered by a reaction between sodium metal and air, the device could be ...

Fuel cells powered with the metal could provide a new source of electric power that's far more energy-dense than lithium-ion ...

It’s a very different approach to those currently in development, but could theoretically offer three times as much power for ...