Sodium-Ion Batteries: How They Work, Pros, Cons and Uses
Updated October 14, 2026
A sodium-ion battery works like a lithium-ion battery but shuttles sodium ions between the electrodes instead of lithium. Sodium is abundant and cheap, so these batteries can avoid lithium, cobalt and nickel, at the cost of lower energy density.
How it works
During charging, sodium ions move from the cathode through an electrolyte into the anode; during discharge they move back, releasing energy. Common cathodes include layered oxides, Prussian blue analogues and polyanion compounds. Because sodium ions are too large to fit well in graphite, the anode is usually hard carbon.
Advantages
- Abundant materials: sodium is widely available, reducing supply-chain risk.
- Cold-weather performance: many designs retain more capacity at low temperatures than LFP.
- Safety and transport: some chemistries can be shipped at zero volts.
- Aluminium current collectors on both electrodes, replacing copper.
Disadvantages
Energy density is lower than lithium-ion, typically similar to or below LFP, so cells are heavier for the same energy. Manufacturing scale is still small, so cost advantages depend on volume and on lithium prices; when lithium carbonate prices fall, sodium-ion''s cost edge narrows.
Where it is used
Early applications include small and budget electric vehicles, two-wheelers, stationary energy storage and backup power. CATL, BYD and others have announced or begun production, mainly in China.
Outlook
The IEA expects sodium-ion to take a modest but growing share of the battery market, complementing rather than replacing lithium-ion.
Frequently asked questions
Is sodium-ion cheaper than lithium-ion?
Potentially, at scale, but the gap depends on lithium prices and production volumes.
Are sodium-ion batteries safer?
They are generally considered to have good thermal stability, but safety depends on the specific chemistry and cell design.