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Li-S Energy[0] is a company with Lithium-Sulphur battery tech that looks to be close to commercial production. They just announced today[1] that they're building a commercial plant that will produce 1000 cells/week (equivalent to 2MWh of batteries annually). Arguably still somewhat vapourware at this point, but much better than most others I've seen.

[0] https://www.lis.energy/

[1] https://www.lis.energy/site/PDF/0f90f952-4a18-45ea-bce9-3c52...

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It appears that this other company uses a similar cathode structure, also based on nanotubes, but the nanotubes are made of boron nitride instead of carbon.

So presumably the patents of these 2 companies are non-overlapping.

In any case, having 2 companies with products based on very similar ideas, but still different, both claiming that are about a year away of starting production, is a good sign that this is something that might be real.

And here is another one:

https://oxisenergy.com/

but this one was set "in administration" on 19 May 2021...

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