This image link shows the differing construction between current Lithium Ion batteries and that of solid state equivalent which employ a solid electrolyte.
![[Linked Image]](https://i.pcmag.com/imagery/articles/06RtwsaGdNDmLlgccYfxqUZ-2..v1667853461.jpg)
Click for full explanation.
As Heinz suggests Toyota seem to be leading development with availability in 2027 but keeping their options open with
Ammonia fueled IC engines the molecules of which contain no carbon.