The NIO ET7 and ET5 performance sedans that are sizing up Tesla's Model S Plaid won't be the first electric cars with semi-solid state batteries, as a humble taxi fleet just got its first delivery of EVs with such packs. Made by the world's largest lithium producer Ganfeng, the E70 electric cars' battery packs are made with solid electrolyte diaphragm.
https://www.notebookcheck.net/First-electric-cars-with-a-semi-solid-state-battery-by-the-world-s-largest-lithium-producer-launch-in-a-taxi-fleet.595233.0.html