From Reddit user:
Honestly, this one sounds like it might be the real deal. The key is:
But this was somewhat of a blessing in disguise Through Hu’s MIT connections, SolidEnergy was able to use the A123’s then-idle facilities in Waltham — which included dry and clean rooms, and manufacturing equipment — to prototype…
…At A123, SolidEnergy was forced to prototype with existing lithium ion manufacturing equipment — which, ultimately, led the startup to design novel, but commercially practical, batteries.
Like they said in the article, the biggest hurdle for the new ‘wonder’ material is always getting that mass production method. This time,
…we were forced to use materials that can be implemented into the existing manufacturing line,” he says. “By starting with this real-world manufacturing perspective and building real-world batteries, we were able to understand what materials worked in those processes, and then work backwards to design new materials.”