Sodium-ion batteries
Sodium-ion batteries, that use salt, have been used in laptops following the creation of a prototype by the French network of researchers and industrial firms called RS2E.
This battery uses a standard that means it can be placed in laptops and even work in electric cars like the Tesla Model S.
The exact method on build and how it works are being kept secret but the 6.5cm battery can manage 90 watt-hours per kilogram, making it comparable to lithium-ion but with a 2000 cycle lifespan, which should be improved.
Sodium-ion Batteries as the Future of Renewable Energy Storage
Read more
https://www.sciencedirect.com/topics/materials-science/sodium-ion-battery
https://www.technologyreview.com/2023/05/11/1072865/how-sodium-could-change-the-game-for-batteries/