In April 2025, CATL stood on stage at its first-ever Super Tech Day and made a claim that, if it holds up, could reshape the economics of electric vehicles: a sodium-ion battery pack, now in mass production, that the company says can push a passenger car roughly 370 miles on a single charge in cold weather. The technology has a new brand name, Naxtra, and a new architecture that blends sodium-ion and lithium-ion cells inside the same pack. No independent lab has verified the range figure yet. But the world’s largest EV battery maker is betting its credibility on a chemistry that most of the industry had written off as too low-energy for anything beyond budget cars and grid storage.
What CATL actually announced
CATL unveiled Naxtra through its official press release on April 9, 2025, describing it as the first mass-produced sodium-ion battery paired with what the company calls a “dual-power architecture.” The concept is straightforward: instead of filling an entire battery pack with one cell chemistry, CATL mixes sodium-ion cells with lithium-ion cells in a single enclosure. Each chemistry covers the other’s weakness.
Sodium-ion cells use sodium, one of the most abundant elements on Earth, instead of lithium. That makes the raw materials dramatically cheaper. CATL’s first-generation sodium-ion cell, previewed back in 2021, quoted an energy density of 160 watt-hours per kilogram, roughly 20 to 30 percent below mainstream lithium-iron-phosphate (LFP) cells at the time. That gap is the reason sodium-ion has historically been dismissed for long-range vehicles. But sodium-ion cells have a standout trait: they retain over 90 percent of their capacity at minus 20 degrees Celsius, according to CATL’s 2021 technical disclosure. Standard LFP cells can lose 20 to 30 percent or more of their usable energy in the same conditions.
The dual-power design exploits that advantage. Sodium-ion cells handle the thermal resilience, keeping the pack functional when temperatures drop. The lithium-ion cells, with their higher energy density, carry the bulk of the range. CATL says the combination, managed by a unified battery management system, allows the pack to deliver long-range performance that neither chemistry could achieve alone.
Why cold-weather range matters so much
Winter range loss is one of the most persistent complaints among EV owners. A 2019 study by AAA found that electric vehicles can lose about 41 percent of their range when the temperature drops to 20 degrees Fahrenheit and the cabin heater is running. More recent data from Recurrent Auto, which tracks real-world EV performance across thousands of vehicles, shows that popular models like the Tesla Model 3 and Chevrolet Bolt can see 25 to 35 percent range reductions in cold climates.
If CATL’s 370-mile cold-weather claim is accurate, it would represent a significant leap. For context, a Tesla Model 3 Long Range is rated at roughly 358 miles under the EPA cycle in temperate conditions. In a cold winter, real-world range for that car often drops to 230 to 270 miles. A pack that genuinely delivers 370 miles in freezing weather would effectively eliminate the winter penalty that makes EVs impractical for some drivers in northern climates.
That is a big “if,” though, and the details matter enormously.
What we still do not know
CATL has not disclosed which test protocol produced the 370-mile figure. China’s CLTC standard, used by most domestic manufacturers, consistently generates higher range numbers than the U.S. EPA cycle or Europe’s WLTP standard. A CLTC-rated 370 miles could translate to 290 to 320 miles under EPA methodology, based on typical conversion ratios observed across Chinese-market EVs. Without knowing the protocol, the number is difficult to compare against vehicles sold in North America or Europe.
The identity of the first vehicle is also unconfirmed. CATL supplies batteries to Tesla, BMW, Mercedes-Benz, Hyundai, NIO, Li Auto, and dozens of other automakers. The company’s promotional materials reference a launch vehicle but do not name the manufacturer, the model, or the target market. Whether this pack appears in a $15,000 city car for the Chinese market or a $40,000 crossover with global ambitions will determine how many consumers actually encounter the technology.
Pricing is another gap. Sodium-ion’s core promise is cost reduction. Sodium carbonate, the primary raw material, costs a fraction of lithium carbonate, which traded above $70,000 per metric ton at its 2022 peak before falling to roughly $10,000 to $12,000 per ton by early 2025, according to Benchmark Minerals pricing data. Even with lithium prices down sharply, sodium-ion’s material cost advantage persists, but CATL has not published a per-kilowatt-hour price for Naxtra cells. Until it does, the cost story remains theoretical.
Long-term durability data is absent as well. Academic research on sodium-ion cycle life is encouraging, with some lab cells exceeding 3,000 full charge-discharge cycles. But lab conditions and real-world driving are different animals. No production sodium-ion pack has accumulated the years of field data that lithium-ion packs now have across millions of vehicles. Early adopters will essentially be generating that data in real time.
The competitive landscape
CATL is not the only company chasing sodium-ion at scale, but it is the furthest along. BYD, the only battery maker that rivals CATL in global shipment volume, has confirmed sodium-ion development and is expected to deploy cells in select models, though it has not announced mass production on a comparable timeline. China’s HiNa Battery began small-batch production in 2023 and has supplied cells for low-speed vehicles and energy storage projects. In Europe, Northvolt had explored sodium-ion research before its financial restructuring in late 2024. Faradion, acquired by India’s Reliance Industries in 2022, has published cell-level specifications but has not announced automotive-scale pack production.
What separates CATL from these competitors is manufacturing muscle. The company shipped roughly 321 gigawatt-hours of batteries in 2024, according to SNE Research, commanding about 37 percent of the global EV battery market. Even if Naxtra accounts for a small fraction of that output initially, CATL’s ability to scale production rapidly is unmatched. The company has factories across China and is building capacity in Germany and Hungary for European supply.
The dual-power approach also gives CATL a structural advantage. Rather than asking automakers to commit entirely to an unproven chemistry, the mixed-cell architecture lets them blend sodium-ion into existing pack designs incrementally. That lowers the risk for vehicle manufacturers and could accelerate adoption faster than a pure sodium-ion strategy would.
What this means for EV buyers and the broader market
For consumers, the near-term impact is limited. No vehicle carrying a Naxtra pack is available for purchase as of June 2025, and CATL has not provided a timeline for retail availability. The technology’s significance is more structural: if sodium-ion packs can deliver acceptable range, charging speed, and longevity in real vehicles, they could push the cost floor for EVs meaningfully lower. That matters most in price-sensitive markets like India, Southeast Asia, and parts of Latin America, where lithium-ion battery costs remain a barrier to mass adoption.
For the lithium supply chain, CATL’s move adds pressure from a different direction. Lithium prices have already cratered from their 2022 highs, squeezing miners and delaying new extraction projects. A viable sodium-ion alternative at automotive scale could cap lithium’s long-term pricing power, even if it never fully replaces lithium-ion in premium, long-range vehicles.
For investors and analysts watching CATL (listed on the Shenzhen Stock Exchange under ticker 300750), the Naxtra launch is a signal of strategic diversification. The company is hedging against lithium price volatility, regulatory shifts favoring supply-chain localization, and the eventual commoditization of LFP cells. Whether that hedge pays off depends on execution: factory yields, customer adoption, and whether the cold-weather performance holds up under independent scrutiny.
Where the evidence stands today
CATL has committed real corporate resources to sodium-ion. The Naxtra brand, the dual-power architecture, and the mass-production announcement are verifiable corporate actions from a publicly traded company with regulatory obligations around disclosure. Those facts are solid.
The 370-mile cold-weather range figure is not. It originates from CATL’s own promotional materials, has not been tested by any independent body, and lacks even basic metadata like the test protocol used. Readers should treat it as a manufacturer’s aspiration until a vehicle certification agency, an automaker’s published spec sheet, or an independent road test confirms it.
The gap between those two categories of evidence is where the real story will unfold over the coming months. Certification filings, supplier contracts, and early owner data will either validate CATL’s boldest claims or reveal the limits of what sodium-ion can deliver at highway speeds in a January snowstorm. Until then, the technology is genuinely promising and genuinely unproven, and both of those things can be true at the same time.
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*This article was researched with the help of AI, with human editors creating the final content.
