https://www.google.com/search?q=goodenough+battery
Here is the event that will moot all argument. The guy who was instrumental in developing the lithium ion battery in the 1990s, has announced a solid state lithium battery. Boom, headshot!
He's now in his 90s. The significance and techology are discussed in the March 3rd EVTV show. The lithium moves from the anode to the cathode [unless dyslexia] and is encased in
glass doped with water. The [other electrode] is carbon. So:
- 1/3 the weight
- performant to minus something degrees
- fire and explosion proof
- low barriers to commercialization
The technology demonstrator uses lithium, but by sacrificing energy density and substituting sodium — you might have a battery made from salt, glass and charcoal.