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New sodium-ion battery skips mechanical cooling with 97.9% efficiency
(interestingengineering.com)
this post was submitted on 09 Aug 2026
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Technology
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The article says that they contain NaCrO₂. That means that, by mass, they are 21% Na, 49% Cr, and 30% O. So I'm curious: why are they called sodium batteries, and not chromium batteries?
Presumably because Na+ ions are the active charge carriers.
By mass it would be mostly graphene or water batteries - like always