China's battery makers are no longer betting on sodium , they are shipping it. In a single week in March, CATL confirmed large-scale Naxtra deployments across EVs, commercial trucks, and grid storage. BYD revealed a third-generation sodium-ion platform capable of 10,000 charge cycles. A Reuters analysis documented at least 370 GWh of announced sodium-ion cell capacity under construction across China, dwarfing every other country combined. Then, in April, CATL turned the dial again. At its Super Tech Day on April 21 in Beijing, the company confirmed full mass production of Naxtra sodium-ion cells by end of 2026. The day before, at the ESIE energy storage expo, CATL unveiled the world's first sodium-ion battery designed specifically for grid-scale storage , a 300+ Ah cell rated for more than 15,000 cycles. Two product lines, one chemistry, both aimed at erasing lithium's monopoly on the global battery market. AI-generated image Sodium-ion battery production lines are ramping across China in 2026, with CATL targeting full mass production by Q4 CATL's Naxtra Hits the Road CATL has moved Naxtra through pilot and early commercial channels, but the company now says full gigawatt-scale mass production is scheduled for Q4 2026. The initial 45 kWh packs target light commercial vehicles: delivery vans, small trucks, and urban logistics fleets where daily range requirements sit comfortably within 200 to 300 km. The specs are competitive. Energy density reaches 175 Wh/kg at the cell level, which puts Naxtra above lead-acid and older LFP cells, though still below the latest lithium iron phosphate packs (which now exceed 200 Wh/kg in cell form). Where sodium shines is cold weather. CATL claims 90% capacity retention at minus 40 degrees Celsius and the ability to accept a charge at minus 30, numbers that would make the packs attractive in northern China, Scandinavia, and Canada. Swappable modules ranging from 42 to 81 kWh are designed for CATL's Choco-Swap network, which the company plans to expand past 3,000 stations in 2026. The swap model matters because it lets fleet operators upgrade chemistry without replacing vehicles. AI-generated image CATL's Naxtra sodium-ion cells are moving toward full mass production in Q4 2026 The passenger car milestone is the next checkpoint. CATL and Changan Auto are co-developing a sodium-ion sedan scheduled for mid-2026 offering more than 400 km of range. GAC's AION division has integrated Naxtra packs into its UT Super variant, with Q2 deliveries planned. If both launches proceed on schedule, sodium-ion will have moved from lab to showroom in under three years. At the April 21 Super Tech Day, CATL also detailed the engineering challenges the company had to crack before Naxtra could scale. The list included four major obstacles: extreme moisture control during cell assembly, hard carbon anode gas generation, bonding aluminum foil current collectors (sodium corrodes copper, so LFP's standard collector cannot be used), and stabilizing anode mass production at the GWh level. According to CATL, the team resolved more than 100 individual engineering problems across those categories. Full mass production, meaning gigafactory-scale output, is now scheduled for Q4 2026. May 2026 Update: Capacity and Orders Are Catching Up CATL followed the April product reveal with two signals that sodium-ion is moving from launch-stage marketing into industrial planning. First, CATL and HyperStrong announced a 60 GWh sodium-ion energy storage supply agreement , described as the largest sodium-ion battery order disclosed so far. The order runs over three years and focuses on stationary storage, where sodium's lower material cost and cold-weather performance matter more than maximum energy density. Second, Chinese battery press reported CATL plans roughly 40 GWh of new sodium-ion capacity in Fujian . If that buildout lands on schedule, sodium-ion stops being an optional chemistry tucked inside existing lithium factories and becomes a dedicated manufacturing line with real volume behind it. BYD's 10,000-Cycle Promise BYD disclosed in early February that its third-generation sodium-ion battery platform can sustain 10,000 full charge-discharge cycles. For context, most lithium-ion EV packs are warrantied for 1,000 to 1,500 cycles, and top-tier LFP cells like BYD's own Blade Battery are rated around 3,000 to 5,000 cycles. A 10,000-cycle sodium cell would be effectively immortal in daily driving and could last 20 to 30 years in a stationary storage application. BYD has not set a firm date for passenger-car mass production , the company describes its timeline as "demand-dependent." Its 30 GWh sodium-ion factory in Xuzhou, backed by a 10 billion yuan (roughly $1.4 billion) investment, has been under construction since early 2024 and is expected to begin output soon. In the meantime, BYD shipped a sodium-ion forklift in January 2026 , its first commercial sodium-ion product , as a low-risk way to validate the chemistry in real-world duty cycles before EV deployment. AI-generated image Urban delivery fleets are a prime target for sodium-ion battery adoption The cycle life advantage feeds directly into the total cost of ownership calculation. A sodium-ion pack that costs 30% less per kWh than LFP upfront and lasts three times longer on cycles could cut battery costs per kilometer to levels that make EVs cheaper to operate than compressed natural gas trucks, currently the dominant choice for Chinese urban logistics. BYD is also eyeing energy storage. With China installing record amounts of grid-scale batteries , the country added over 50 GWh of stationary storage in 2025 , a cheaper, longer-lived chemistry with no thermal runaway risk could accelerate deployments even further. BYD's blade-format cell design, proven in millions of LFP vehicles, could translate directly to sodium-ion storage containers without major retooling. CATL's Grid Storage Sodium-Ion: A New Front The biggest sodium-ion announcement in April did not come from an EV stage. At the ESIE 2026 energy storage expo in Beijing, CATL unveiled its first platform-based sodium-ion battery for utility-scale storage , a product that had not existed before and that targets an entirely different market than the Naxtra vehicle cells. CATL Sodium-Ion Grid Storage Cell: Key Specs • Cell Capacity: 300+ Ah large-format • Energy Density: ~160 Wh/kg • Cycle Life: 15,000+ cycles (80% retention) • Round-Trip Efficiency: 97% • Operating Range: -40°C to 70°C • Chemistry: Hard carbon anode, layered oxide cathode; cobalt- and nickel-free • Form Factor: Compatible with CATL's existing 587 Ah LFP enclosures • Safety: No thermal runaway in penetration, crush, or overcharge tests • Deployment: Commercial deployment within 2026 The form-factor compatibility is the strategic hook. By building the sodium-ion storage cell to the same physical dimensions as CATL's market-leading 587 Ah LFP cell, customers can deploy sodium-ion in existing enclosures, use the same manufacturing and supply chain infrastructure, and switch chemistries without redesigning their systems. This dramatically lowers the adoption barrier for project developers who have already standardized on CATL equipment. The target markets are 2-to-8-hour grid discharge, renewable energy firming, and AI data center backup. CATL chairman Robin Zeng has said sodium-ion could eventually capture 30 to 40 percent of the total battery market , a number that implies it is not positioning sodium as a niche product but as a broad-based alternative that competes with LFP on cost while outperforming it in cold climates and cycle longevity. 370 GWh and Counting The scale of China's sodium-ion buildout is staggering. According to CRU Group's 2026 analysis, Chinese companies have announced more than 370 GWh of sodium-ion cell manufacturing capacity , roughly 98% of all announced sodium-ion capacity worldwide. Capital expenditure runs about $53 million per GWh, making sodium factories