A surprising breakthrough could help sodium-ion batteries rival lithium—and even turn seawater into drinking water. Scientists discovered that keeping water inside a key battery material, instead of removing it as traditionally done, dramatically boosts performance. The “wet” version stores nearly twice as much charge, charges faster, and remains stable for hundreds of cycles, placing it among the top-performing sodium battery materials ever reported.
If they have a bit lower energy density than Lithium batteries, then where does the claim that they store twice the energy come from?
Twice the energy than the previous sodium battery tech. Nowhere does it say its twice as good as Li-ion. That’s an assumption you made.