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I thought the prospects for flow batteries were becoming fairly dire due to the decline in cost of Li-ion cells.

LFP promises better fire behavior than older Li-ion technologies, I think.

>> LFP promises better fire behavior than older Li-ion technologies, I think.

LFP's thermal runaway threshold is higher than other lithium ion battery types, but once TR starts, LFP generates more hydrogen gas that can explode if not air-vented out fast enough.

I suspect for extremely large batteries or seasonal shifting (summer->winter) flow batteries will still have a place, but I could be wrong.

Thermal batteries make more sense for that, but they need to be super-cheap. One possibility:

https://austinvernon.site/blog/standardthermal.html

Flow batteries aren't any good for seasonal shifting; the capex per kWh-capacity is much too high. Granted, ordinary batteries aren't good for that either.

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