CATL, the world's largest battery maker, signed a three-year, 60 GWh sodium-ion supply agreement with Chinese energy storage integrator HyperStrong on April 27, 2026, in Ningde. The deal is the largest sodium-ion battery supply contract recorded to date, and it landed alongside CATL's announcement that its Naxtra sodium-ion cell has reached GWh-scale industrialization, with full-scale mass production scheduled to begin by the end of 2026.
The timing matters because the global battery market is still running on lithium. According to the IEA's Global EV Outlook 2026, electric vehicle battery deployment grew by almost 30% in 2025, and EVs remained the primary source of global battery deployment. Lithium iron phosphate (LFP) cells dominate that volume, and lithium supply chains have tightened accordingly. A chemistry that removes lithium and cobalt from the bill of materials is not a science project anymore; it is a hedge.
The nut graf is simple: if CATL delivers on 60 GWh of sodium-ion capacity, stationary storage developers get a second, cheaper chemistry with wider temperature tolerance, and the lithium market loses some of its leverage over grid-scale project economics. Whether that happens depends less on CATL's chemistry than on whether hard carbon anode suppliers can scale alongside it.
What sodium-ion actually buys
Sodium-ion cells work on the same intercalation principle as lithium-ion, with ions shuttling between cathode and anode during charge and discharge. The difference is in the materials. Sodium is far more abundant than lithium, the cells use no cobalt, and they can use aluminum current collectors on both electrodes instead of copper on the anode. According to the American Physical Society, sodium-ion cells also tolerate wider temperature ranges than conventional lithium-ion chemistries, maintain cycle stability at high ambient temperatures, and generate less heat during operation, which reduces the load on thermal management systems.
That temperature tolerance is not a footnote. In grid storage and in cold-climate EV markets, thermal management is a real cost line. A cell that behaves across a wider temperature band trims hardware, simplifies pack design, and reduces the cooling budget a project has to carry.
The trade-off is energy density. Sodium-ion cells store less energy per kilogram than LFP, and their hard carbon anodes are harder to produce consistently than the graphite anodes used in lithium-ion designs. Controlling gas generation in hard carbon production, managing moisture exposure, achieving reliable adhesion of the aluminum current collector, and tuning anode formation protocols are the engineering obstacles that kept the chemistry out of volume production for years.
CATL's manufacturing claims
CATL says it resolved several of those bottlenecks through specific process work. The company cites angstrom-level pore size regulation, surface molecular water-locking, and adaptive dynamic formation as the techniques that let it control output consistency at high volume. On the materials side, it claims energy density gains over previous commercial sodium-ion attempts through morphology control and surface modification.
The Naxtra battery, announced at CATL's Super Technology Day in Beijing, is the product of that work. CATL describes it as the result of resolving hundreds of engineering challenges, with four named bottlenecks: extreme water control, gas generation in hard carbon production lines, aluminum foil adhesion, and self-forming anode systems. The company says full-scale mass production will begin by the end of 2026.
One design choice worth noting: CATL says its sodium-ion cells share a platform-based design with the same form factor as its lithium-ion products. That reduces integration costs for operators and shortens the time from product qualification to power station deployment. It is also a hedge. If the chemistry underperforms, the same lines and tooling can pivot back to lithium-ion with less stranded capital.
The HyperStrong agreement
HyperStrong is CATL's first strategic partner for sodium-ion energy storage, and the three-year, 60 GWh commitment covers technology research and development, product applications, and project deployment. CATL describes the deal as the largest sodium-ion battery supply agreement in the world to date.
The structure matters more than the headline number. A 60 GWh commitment over three years is roughly 20 GWh a year, which is real volume but not transformative against a global market that deployed well over a terawatt-hour of battery capacity in 2025. What it does buy is a reference customer, a production ramp with committed offtake, and a proof point that a major integrator is willing to build around sodium-ion instead of waiting for the chemistry to mature.
It is not clear this will hold. HyperStrong's willingness to commit 60 GWh assumes CATL's yield and consistency claims survive contact with volume production, and that the supply chain behind hard carbon anodes develops at the pace the timeline implies.
The supply chain question
The open question is whether hard carbon anode supply chains can develop at the pace that matches CATL's commitments and timelines. That answer will dictate the scale to which CATL and other battery manufacturers can produce sodium-ion cells.
Hard carbon is the least mature link in the sodium-ion stack. It is not graphite, and the process knowledge for producing it at battery grade does not exist in the same depth. Yields, moisture control, and adhesion to aluminum collectors are all problems that get harder, not easier, at GWh scale. CATL has solved them in its own lines, by its own account, but a single manufacturer's internal capability does not make a supply chain.
This is where the 60 GWh deal cuts both ways. It creates demand that should pull anode suppliers into the market, but it also concentrates risk. If CATL's internal hard carbon process does not transfer cleanly to external suppliers, the industry ends up with one vertically integrated sodium-ion producer and a chemistry that never becomes a commodity.
What to watch next
Three data points will settle whether this is a real shift or a well-funded pilot. First, whether CATL's Naxtra cells ship in volume before the end of 2026, not just in announced production. Second, whether HyperStrong's first sodium-ion projects come online on schedule, which would validate the integration and qualification timeline CATL is claiming. Third, whether a second major manufacturer announces a comparable sodium-ion supply agreement in 2027; a single-source chemistry is a risk, not a market.
The IEA's battery deployment figures suggest the underlying demand is there. The question is whether sodium-ion captures any meaningful share of it before 2028, or whether it stays a stationary-storage niche while lithium, and increasingly LFP, keeps the EV market.
For more on battery supply chains and cell chemistry, see our battery tech coverage. The Reuters battery supply chain reporting is a useful running reference on gigafactory and materials news.
CATL's Naxtra line is scheduled to begin full-scale mass production by the end of 2026, with cumulative shipments expected to reach 1 GWh by year end and global deliveries to begin in June 2027. That is the clock the rest of the industry is now running against.