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What is a Solid-state Battery?
https://www.samsungsdi.com/column/technology/detail/56462.html?listType=gallery

If you look at the image above, the Li-ion battery, which is commercially used, has a separator that keeps cathode and anode apart, with liquid electrolyte solution. On the other hand, the solid-state battery uses solid electrolyte, not liquid electrolyte solution, and the solid electrolyte plays a role of a separator as well.

Solid-State Batteries Promise Electric Car Popularity Boost, But Technical Mountains Await
https://www.forbes.com/sites/neilwinton/2021/11/28/solid-state-batteries-promise-electric-car-popularity-boost-but-technical-mountains-await/?sh=5ee413d2632f

News reports have suggested Chinese electric car maker NIO will offer the technology next year, Toyota and Volkswagen in 2025, while BMW, Stellantis, Mercedes, Renault-Nissan offer various dates before 2030.

Fitch Solutions doesn’t expect solid state batteries before 2030, which it said will boost energy density, fast-charging and better thermal regulation than liquid-electrolyte rivals.