The BIGGEST problem with clean energy

I feel like these Toyota sponsered videos are always somewhat biased vs lithium ion batteries. I liked your intros to different tech, but on the technology readiness scale, they are not the same. Todays research points toward lithium ion batteries going to be the cheepest storage tech for up to some days of energy storage. Cathode recycling and alternative battery chemistries like LFP, related Sodium-Ion batteries etc. can solve the materials shortage (and are quite far along on the technology readiness scale). They are not an option for seasonal storage, but that isn't really what was talked about in this video.