Science
What are sodium-ion batteries made from?
A sodium-ion cell contains far more than sodium: cathode active material, hard carbon, electrolyte salts and solvents, separator, aluminium, binders and a case.
What matters
Cathode families include layered transition-metal oxides, Prussian-blue analogues and polyanionic materials. Each balances voltage, capacity, stability, moisture sensitivity and mineral use.
The detail
Hard carbon commonly forms the anode. Electrolyte chemistry must create stable interfaces, while separator porosity and current collectors carry ions and electrons safely.
Practical conclusion
Ask for the actual chemistry before making a sustainability or safety claim. “Sodium-ion” alone does not reveal nickel, manganese, vanadium or solvent content.
Sources
- Sodium-ion battery momentum grows, but challenges remain — International Energy Agency, 17 February 2026.
- Sodium-ion cell design research call — The Faraday Institution, June 2026.
Sources last checked 10 November 2026. Product availability can change.