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Comment on New sodium ion battery stores twice the energy and desalinates seawater

TNT has 1162 Wh/kg ratio.

These new lithium-ion batteries get to 300-400Wh/kg range.

We are hitting the limit what is doable with energy density. Do you really want to carry 100g of TNT in your pocket vs few kilotons of TNT in vehicle going 100km/h.

Of course things are not directly comparable, but ball parks.

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GamingChairModel@lemmy.world ⁨9⁩ ⁨hours⁩ ago
Yeah but firewood is like 5 kwh/kg, or 4 times the energy density of TNT. We drive around with wood in our cars all the time.

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UnderpantsWeevil@lemmy.world ⁨9⁩ ⁨hours⁩ ago

TNT has 1162 Wh/kg ratio.

How do you recharge TNT?

We are hitting the limit what is doable with energy density.

I mean, we’re definitely running into a problem of how you build a battery without also building a bomb. But the entire point of TNT is rapid thermal expansion. The point of a battery is very low voltage steady release of electrical charge.

I might also note that C4 has around 6 Mwh/kg. A bit of applied chemistry can go a long way to improving energy efficiency. And that’s before you take advantage of geometry to focus pressure, via a shaped charge.

Point being, there’s a lot of clever ways to juice a lemon. We’re a long way from the end of the road on battery efficiency.

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explodicle@sh.itjust.works ⁨10⁩ ⁨hours⁩ ago
Kinda, yes? Phones already do so much, why not one additional feature to deter theft.

We’ve got a lot of that going around in the USA right now.

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