Comments by "Devil\x27s Offspring" (@devilsoffspring5519) on "Thoughty2"
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Local stationary energy storage for sustainable energy systems doesn't require high energy density though, which is the expensive part and also the very dangerous part. For bulk stationary storage the only requirement is that it's very cheap per unit of storage and can operate at part-charge without damage. Unfortunately, lead-acids don't fit the bill because even though they're relatively cheap and very safe, they get damaged unless maintained at 100% charge.
Nickel-based chemistries are too expensive, lithium-ion is far too dangerous in large aircraft-hangar sized installations and tends to be very expensive as well. Perhaps LFP (lithium ferrophosphate) cells would be a good intermediate solution for local bulk storage but they are still far too expensive. Their cycle life and calendar life are outstanding, though.
For large cities like Toronto, Montreal, NYC, L.A. and the like, having huge local battery storage systems might be a really good idea to relieve power stations from conditions of peak demand. It's just that battery technology is too dangerous and much too expensive right now.
The highest possible energy density is only necessary for EVs, and is especially necessary for electric aircraft. The best current battery tech is much too dangerous and expensive, so even the best EVs are a very costly niche product and likely will remain so for many decades. They can get away with it for relatively small numbers of very expensive luxury & performance oriented vehicles, but EV still have no way to compete with internal combustion engines for low cost and high practicality & convenience. Long-range low-cost practical air travel entirely on green energy is a dream for the future--and an actual goal for the distant future.
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