this post was submitted on 21 Sep 2025
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Electric Vehicles
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I'm not that tech savvy: what is the average Li-ion density?
This is from memory, but i think it's approximately accurate, especially in relations to each other:
Li-ion have 280-320 Wh/kg but they have the disadvantage that they're explosive. If you get in an accident and the battery gets damaged, it explodes rather violently, and you don't want that for safety reasons.
Then there's LFP batteries which also contain Lithium as the main ingredient, but they have the advantage that they don't explode when they're damaged. They have 220-250 Wh/kg.
Then there's Na-ion, which also have the advantage of not exploding when damaged, and they have 160 Wh/kg (depending on type, new types with better energy density are being actively researched right now). They have the additional advantage of not containing Lithium (Li), instead they contain Sodium (Na), which is significantly cheaper and more widely available worldwide. So the batteries have the prospect of being much cheaper, especially if produced in large scales, and that's really the main advantage they have.
It's not so much about Wh/kg for stationary applications (like grid stabilization or home storage), instead it's about Wh/$, i.e. how much storage capacity you get per dollar. And that is significantly higher for Na-ion than for Li-ion or LFP.
A tank of gasoline is far more likely to explode with 10x more energy.
Unfortunately I can't seem to refill my tank by passing in excess electricity. Pretty sure I can recharge the battery more than 10 times and get more energy over lifetime of usage
i'd say it's equally likely, and yes, internal combustion engine vehicles are literally madness. it's a miracle anybody actually uses these machines, IMO. they sound insane.
Not equally, much more likely as a function of distance driven. If we had started with EVs and considered transition to gasoline, people would have considered it insanely dangerous.
That not even considering the ships, tanker cars and trucks blowing up, sometimes taking out entire cities.
What truck has taken out an entire city? We did pretty much transition from EVs to ICE, EVs have been around at least as long as ICE vehicles.
EVs explode at about 1/40th the rate of combustion vehicles. They are 40 times less likely to explode.
Easy peasy to set 96kwh of these on the side of my house or in a utility closet and I'll basically never experience a blackout or loss of power again.
I didn't know either but Wikipedia says 1–270 W⋅h/kg for specific energy. It lists energy density in litres.
The ones typically used in cars are listed as 90–160 [Wh/kg].
Sodium chemistry works well down to -20C , they don't drop off in efficiency like lithium.