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this post was submitted on 18 Sep 2025
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These things are a game changer. For a car, you don't need the energy density of li-ion. They don't fly, they don't get carried around by people.
They are significantly safer than lithium-ion. They don't burst into flames if the container is breached. They don't build up hydrogen bubbles. I believe they have a higher cycle lifespan. And they don't degrade when fully charged or discharged like lithium do.
They are also much more environmentally friendly to develop and cheaper to produce (which mean they will never be allowed into the US because of Elon Musk).
One downside is that compared to other solutions this is a really heavy battery afaik, but honestly having no fire hazards and way better lifespan totally worths this tradeoff
The energy density isn't bad. A lead acid battery has 80Wh/L, and a sodium ion battery is 250Wh/L. Now high-end lithium ion batteries can reach 600Wh/L.