There's an Australian company called Li-S Energy[0] that claims to have solved the same problem a different way, using boron nanotubes. They state the theoretic

There's an Australian company called Li-S Energy[0] that claims to have solved the same problem a different way, using boron nanotubes. They state the theoretical limit for a lithium-sulphur battery is 2,567Wh/kg, which is around 5x that of a standard lithium-ion. [0] https://www.lis.energy https://www.lis.energy