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Sodium batteries hit 458 Wh/kg: New material closes gap with lithium
(interestingengineering.com)
this post was submitted on 23 Dec 2024
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Are you thinking of concentrated solar, maybe?
I think I was mixing those up with thermal energy storage and thermal batteries.
https://en.m.wikipedia.org/wiki/Thermal_energy_storage
https://en.m.wikipedia.org/wiki/Molten-salt_battery#Thermal_batteries_(non-rechargeable)
Sodium batteries do have a high temperature type, but it does look like they are non rechargeable and do generate electricity directly. The thermal energy storage only stores thermal energy rather than electricity, but they use sand.