Sodium-Ion Batteries Explained: How They Work, Cost and Where They Fit
Sodium-ion batteries work almost exactly like lithium-ion batteries, with one change: the lithium is replaced by sodium, the element in table salt. After a decade as a laboratory promise, they reached real products in 2025 and 2026, including grid storage in the United States and the first mass-market passenger car in China.
This guide explains how a sodium-ion battery works, how it compares with lithium-ion, what it costs today, and where you are likely to meet one.
Short answer
A sodium-ion battery stores energy by moving sodium ions between two electrodes, the same way a lithium-ion battery moves lithium ions. It uses no lithium, cobalt or nickel. It stores less energy per kilogram than lithium-ion, but it performs much better in the cold and is considered very safe. In 2026 it is not yet cheaper than lithium iron phosphate (LFP), and it is used mainly in grid storage, small cars and cold-climate products.
Key takeaways
- Sodium-ion cells store about 75 to 175 Wh/kg. Mainstream LFP cells store about 160 to 200 Wh/kg.
- The best sodium-ion cell on the market, CATL’s Naxtra, reaches up to 175 Wh/kg, which matches ordinary LFP.
- Cold is the main advantage. CATL claims more than 90% of capacity at -40 °C.
- Sodium-ion is not cheaper yet. Estimates for 2025 put cell costs slightly above LFP, with lower costs expected as production grows.
- Outside China the first real market is grid storage, not cars or home batteries.
What is a sodium-ion battery?
A sodium-ion battery is a rechargeable battery in which sodium ions carry the charge. Sodium sits directly below lithium in the periodic table and behaves in a similar way chemically, so the two battery types share the same basic design and can be built on much of the same factory equipment.
The idea is not new. Sodium-ion and lithium-ion cells were both studied in the 1970s and early 1980s. Lithium won because it stored more energy, and sodium research faded until the early 2010s, when rising lithium prices brought it back.
How a sodium-ion battery works
The cell has four main parts: a positive electrode (cathode), a negative electrode (anode), a liquid electrolyte and a separator. During charging, sodium ions leave the cathode, cross the electrolyte and settle in the anode. During discharge they travel back, and electrons flow through the external circuit to do useful work.
The materials inside
- Cathode. Three families compete: layered metal oxides (usually based on iron and manganese), Prussian blue analogues, and polyanion compounds such as sodium phosphates. Layered oxides give the most energy. Polyanion types last longest.
- Anode. Hard carbon, a disordered form of carbon. Graphite, the standard lithium-ion anode, does not store sodium well.
- Current collectors. Aluminum on both sides. Lithium-ion cells need copper on the anode side, which costs more.
A sodium-ion cell runs at about 3.0 to 3.1 volts, a little lower than lithium-ion. Because of the aluminum collectors, it can also be discharged to zero volts for shipping, which removes most of the transport fire risk.
Sodium-ion vs lithium-ion
| Property | Sodium-ion | Lithium-ion (LFP) |
|---|---|---|
| Energy per kilogram | 75–175 Wh/kg | 160–200 Wh/kg |
| Cell voltage | About 3.0–3.1 V | About 3.2 V |
| Cold-weather performance | Very good, usable well below -20 °C | Weak, charging is restricted below freezing |
| Safety | Very good | Very good |
| Cycle life | Hundreds to several thousand cycles, depending on chemistry | Typically 3,000–6,000 cycles |
| Critical raw materials | No lithium, cobalt or nickel | Lithium |
| Cell cost in 2025 | Slightly higher | Lower |
Why sodium-ion stores less energy
A sodium ion is larger and heavier than a lithium ion, and the cell voltage is lower. Both reduce the energy a cell can hold for its weight. For years that meant a gap of 30% or more against LFP. The newest cells have closed most of it, but sodium-ion remains well behind the nickel-based NMC cells used in long-range EVs.
Why it does better in the cold
Lithium batteries lose capacity and power in freezing weather, and most LiFePO4 batteries must not be charged below 0 °C without a heater. Sodium-ion cells keep working. CATL says its Naxtra battery retains more than 90% of its capacity at -40 °C and delivers nearly three times the power of an equivalent LFP pack at -30 °C. These are company figures, not independent tests.
Are sodium-ion batteries cheaper?
Not yet. Sodium is far more abundant than lithium, and the cells avoid copper, cobalt and nickel, so the raw materials are cheaper. But lithium prices fell sharply after 2023, and LFP is made at enormous scale while sodium-ion is not.
Wood Mackenzie estimated 2025 cell costs at about $59 per kWh for sodium-ion against $52 for LFP. The International Renewable Energy Agency has said sodium-ion cells could fall to about $40 per kWh as production grows. Claims of batteries that are 30 to 50% cheaper describe that future, not today’s prices.
The stronger argument for sodium-ion is supply security. It gives battery makers a second chemistry that does not depend on lithium, one of the most watched critical minerals.
Where sodium-ion batteries are used in 2026
Electric cars
CATL, the world’s largest battery maker, launched its Naxtra sodium-ion battery in April 2025. In February 2026, CATL and Changan unveiled what they call the first mass-produced passenger car with sodium-ion batteries, a version of the Changan Nevo A06 with a 45 kWh pack and a range of about 400 km, slated to go on sale in China in mid-2026. Earlier sodium-ion cars, from JAC and JMEV, were small city cars with ranges near 250 km.
No sodium-ion car has been announced for the US or Europe. The chemistry suits small and mid-size cars and cold regions. It does not suit long-range models.
Grid storage
Weight matters little for a battery that sits on a concrete pad, so grid storage is the natural fit. In the US, Peak Energy energized a sodium-ion system for RWE in Wisconsin in March 2026. The company says its passively cooled design cuts auxiliary power use by 90%. Peak has announced more than 6 GWh of customer commitments and a system assembly plant in Sacramento, California, due to start production in early 2027. Its cells are currently made in China.
The US industry has also had a notable failure. Natron Energy, which made sodium-ion batteries in Michigan and had announced a $1.4 billion factory in North Carolina, shut down in September 2025 after it could not raise more capital.
Home batteries and portable power
For homes, sodium-ion is still rare. Almost every home battery backup system and solar battery on sale uses LFP. The first consumer product was Bluetti’s Pioneer Na, a 900 Wh portable power station released in October 2025. Bluetti says it can charge at -15 °C and discharge at -25 °C, which is the point of the product: it is built for winter use.
If you live in a mild climate, there is no reason to wait for sodium-ion before buying a home battery. If you need storage in an unheated garage or cabin in a very cold region, it is worth watching.
Sodium-ion vs solid-state batteries
The two are often mentioned together but aim at opposite goals. Solid-state batteries chase more energy and longer range at a higher price. Sodium-ion accepts less energy in exchange for cheap, abundant materials and cold-weather performance. They are likely to serve different ends of the market.
FAQ
What is the main disadvantage of sodium-ion batteries?
Lower energy density. A sodium-ion pack is heavier and larger than a lithium-ion pack of the same capacity, which limits driving range in cars.
Will sodium-ion batteries replace lithium-ion?
Unlikely. They are expected to take a share of grid storage, small cars and cold-climate products, while lithium-ion keeps the applications where weight and range matter most.
Are sodium-ion batteries safer than lithium-ion?
They are considered very safe, broadly similar to LFP. CATL reports that its cells passed crush, drill and saw tests without fire. They can also be shipped at zero volts.
How long do sodium-ion batteries last?
It depends on the chemistry. Early cells managed a few hundred to a few thousand cycles. CATL claims more than 10,000 cycles for Naxtra. Independent long-term data is still limited.
Can I buy a sodium-ion home battery today?
Only in a few niche products, such as portable power stations for cold weather. Mainstream home batteries still use LFP.
Do sodium-ion batteries use rare earths or cobalt?
No. They contain no lithium, cobalt, nickel or rare earth elements. The main materials are sodium, iron, manganese, carbon and aluminum.
Sources
- CATL: CATL and Changan Launch World’s First Mass-Production Sodium-Ion Passenger Vehicle (February 2026)
- CnEVPost: CATL’s sodium-ion batteries begin deployment in production-ready passenger vehicles
- New Atlas: Production EV packing sub-zero-operation sodium-ion batteries on its way
- Wikipedia: Sodium-ion battery
- Seplos: Sodium-Ion Battery vs LFP (citing Wood Mackenzie cost estimates)
- pv magazine USA: RWE, Peak Energy to deploy first sodium-ion battery in U.S. grid
- Slashdot: America’s First Grid-Scale Sodium-Ion Battery Plant Gets Its First Big Test
- Data Center Dynamics: US sodium-ion battery developer Natron Energy shutters operations
- TechRadar: Bluetti’s sodium-ion portable power station
This article reflects the author’s personal views and publicly available information as of October 2026. It is general information, not purchasing advice.
