MS explains that "In a world increasingly driven by AI and highly energy-intensive… sodium-ion batteries address a critical bottleneck… where energy security intersects with AI. Energy and chemical analysts from China at MSR believe this new generation of batteries could redefine energy security and disrupt both new deployments and the installed base. Sodium-ion batteries offer a cost advantage of 30-40% compared to LFP (Lithium Iron Phosphate) batteries… and also provide better performance in cold climates. They expect sodium-ion batteries to achieve a market share of 2% in total battery deployment by 2027, accelerating to 20% by 2030 and 37% by 2035".
Sodium-ion batteries (Na-ion) are one of the most promising technologies in the world of energy storage. They are emerging as the main alternative to the ubiquitous lithium-ion batteries, especially for affordable electric cars and energy storage in the power grid.
Advantages
- Abundance and low cost: Sodium is one of the most abundant elements on Earth (found in common salt). Lithium, on the other hand, is scarce, expensive, and its extraction is concentrated in a few countries. Sodium batteries can be 20% to 30% cheaper to manufacture.
- Safety: They are much more thermally stable than lithium batteries, meaning the risk of overheating or catching fire is drastically lower. They can even be transported discharged to 0 volts completely safely.
- Performance in cold climates: While lithium batteries lose a lot of efficiency when the temperature drops, sodium-ion batteries maintain excellent performance even at -20 °C.
- Fast charging: They have a cell structure that allows ions to move quickly, achieving charges of up to 80% in about 15 minutes.
Disadvantages
- Lower energy density: This is their Achilles' heel. Sodium atoms are larger and heavier than lithium atoms. This means that, for the same size and weight, a sodium battery stores less energy (currently between 140-160 Wh/kg compared to more than 250 Wh/kg for lithium).
- Greater weight and volume: To provide the same range as a long-range lithium electric car, the sodium battery would have to be enormous and very heavy.
- Shorter lifecycle (in development): Although it is improving rapidly, they generally withstand fewer charge and discharge cycles before starting to degrade compared to the best lithium batteries.
Main current and future applications
Due to their weight, don’t expect to see them soon in your mobile phone or laptop, but they are suitable for:
- Grid storage: Storing energy from wind or solar farms for use when there is no wind or sun. Here, space and weight do not matter, but low cost and safety do.
- Urban electric vehicles: Small cars and motorcycles that do not need massive ranges (for example, daily trips of 200-300 km) but do need an affordable selling price.
- Micromobility: Electric scooters and bicycles.
Giant battery companies (such as the Chinese CATL or BYD) have already begun mass production of these cells, and the first compact cars with sodium batteries are already rolling on the streets.