What about a cell that instantly dries out when exposed to air from a puncture or rapid expansion of fire retardant foam on puncture per cell? Could each cell be filled with a gas that when hit and depleted renders the cell or pack safe? Battery becomes recoverable and fixable? It just seems in 2021 that runaway should be stoppable with some isolating material. NASA made the common bulkhead with 2 drastically different temperatures can each pack of cells within the total battery be isolated with that?A functional solid-state battery would be superior to Li-ion battery is most every respect. However, they would still be hazardous.
The electrical lines running through your house have no anode, nor cathode, nor electrolyte of any kind, and yet they still cause fires.