Electric Vehicles

That's good news, but until i see them being sold, i don't believe it

The "fast charging" is going to be the key for this one. Sodium batteries already exist. They aren't so great at certain tasks simply due to how the chemistry works: The voltage constantly drops as the battery discharges.

That makes a pretty big impact on both its actual maximum capacity, and can greatly reduce its usable capacity. As voltage drops, to get the same amount of actual power out, the current has to go up. Unless the batteries are grossly over-provisioned, the point where you exceed the deliverable amperage from the batteries arrives shockingly fast. To the point where the usable capacity is pretty sad.

Though if (and that's a big if) these batteries can both take and deliver very high current, that point doesn't arrive so quickly. They'll undoubtedly still have quite a bit less capacity than the equivalent Lithium based batteries, because that's how the chemistry works, but depending on their use case, it's not important to have hundreds of miles of capacity in one charge. Especially if they're swappable.

Li-Ion is a huge achilles heel for EVs. Moving past them could be what's needed to actually get competitive.