CATL has revealed a “One Shell, Two Cells” battery platform that allows automakers to swap between lithium-ion and sodium-ion cells within the same physical pack, targeting the persistent problem of winter range loss in cold-climate regions. The chemistry-agnostic design, combined with a 15,000-cycle durability claim, positions sodium-ion as a commercially viable complement to LFP batteries.
Developed by CATL’s domestic energy storage team under CTO Lin Jiubiao, the architecture uses a standardized physical shell accommodating either lithium or sodium cells without requiring manufacturers to redesign chassis mounting points or thermal management systems. For battery-swap networks like NIO’s Power Swap or CATL’s EVOGO ecosystem, operators can load cold-resistant sodium packs during winter and higher-energy-density lithium packs in summer through the same infrastructure.
Cold-Weather Performance
In regions like Xinjiang where temperatures routinely fall below -25 degrees Celsius, conventional LFP batteries can lose up to 40% of usable capacity while charging times double, per CATL. The company’s sodium-ion cells maintain far more stable capacity and charging performance at these temperatures because sodium ions face fewer kinetic barriers during low-temperature intercalation compared to lithium ions.
CATL has invested nearly 10 billion yuan (approximately $1.5 billion) to solve hard-carbon anode manufacturing bottlenecks, particularly moisture and gas control. Cathode supplier Ronbay Technology has achieved 15,000-cycle durability on its polyanionic NFPP cathode material while pushing electrode compaction density to 2.5 g/cm³.
15,000 Cycles and Cost Trajectory
The 15,000-cycle target effectively means a battery that can outlast the vehicle. For a driver covering 15,000 km annually with a 400 km pack charged weekly, only about 2,000 cycles are needed over 20 years. CATL signed a three-year, 60 GWh sodium-ion storage agreement with HyperStrong, signaling immediate commercial demand beyond automotive. CATL Chief Scientist Wu Kai confirmed manufacturing bottlenecks are resolved, with sodium-ion now targeting 600 km single-charge range — directly competing with entry-level LFP.
On costs, Wanhua Chemical projects synthetic hard carbon anode material reaching 35,000-40,000 yuan per ton (about $5,200-$5,900) by end-2026, with a long-term target below 25,000 yuan per ton (about $3,700). Ronbay Technology has 6,000 tons of cathode capacity online, plans 28,000 tons by end-2026, and a 300,000-ton target by 2027.
The development follows CATL’s sodium-ion battery mass production confirmation for 2026 and reinforces the company’s dominance: CATL held 40.1% of the global EV battery market in January-April 2026, more than double BYD’s 14.2%, per SNE Research.
