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Out of Spec Dave visits a few days before it catches fire,

It is not looking good for Toyota's all-solid-state battery (ASSB).

They just announced that it won't be until 2030 when you can expect them in actual production cars and only in a small-scale then (10,000 limited-production vehicles).

They announced their partnership with Idemitsu to manufacture their ASSBs.

They use a sulfide powder for the solid electrolyte like Solid Power does, which is coated as a slurry and then cooked. The rest of the battery is the same as in a conventional lithium-ion battery minus the liquid electrolyte and porous-membrane separator, using a carbon (with some silicon) anode and an NMC etc. cathode.

The main problem with the ASSB is durability (cycle life). As the solid-state cells expand (during charging) and contract (during discharging), the solid electrolyte between the anode and the cathode tends to crack and ruin the battery. To circumvent the problem, high externally applied pressures and even high temperatures are often necessary, which could...

Safety last?

Tesla workers report explosions, concussions, and grisly robot injuries at Texas factory - The Verge