Hydrogen fuel cells, which power some electric cars, pack far more energy per weight than lithium-ion batteries. The devices also show promise for decarbonizing aviation, shipping, and trucking. But ...

If three cell chemistries are good, are four better? Today, General Motors unveiled plans to develop and build sodium-ion battery cells in partnership with a startup called Peak Energy. The plot twist ...

Fuel cells powered with the metal could provide a new source of electric power that's far more energy-dense than lithium-ion batteries. A new type of fuel cell that runs on sodium metal could one day ...