Brazil risks missing sodium-ion battery manufacturing opportunity

Every technology cycle has its moment of triumphant announcement, and sodium-ion batteries reached that point this year. CATL signed a 60 GWh contract with HyperStrong for sodium-based energy storage systems over three years – the largest commercial commitment yet for this chemistry – and has promised gigawatt-hour-scale shipments starting in 2026.

Sodium-ion cell production costs, which were around CNY 0.35 ($0.05)/kWh to CNY 0.40/kWh in the first quarter, are expected to approach those of lithium iron phosphate (LFP) batteries by 2027. Cycle lives above 8,000 cycles, stability between -40 C and 45 C, and lower thermal runaway risk make sodium-ion batteries, on paper, an ideal chemistry for a tropical country with excess solar generation and a national grid operator that increasingly struggles with midday renewable surpluses.

And this is where the celebration needs to stop.

Brazil has already lived through this script. The country has abundant raw materials, universities publishing promising studies, and experts highlighting its potential – yet it remains, year after year, a final buyer of technologies it helped inspire but never helped manufacture. “We have plenty of lithium” has simply become “we have plenty of sodium,” while the structure of the argument remains the same: promises of leadership that never leave the presentation slide.

Same script, different element

Researchers at Lactec and the state universities of Londrina and Campinas are developing sodium-ion battery prototypes at laboratory and pilot scale. This is real work and deserves recognition. The problem is the gap between a laboratory prototype and a production line capable of competing with CATL, BYD, Changan, and GAC Aion.

These companies have already signed industrial contracts, launched commercial brands such as CATL’s Naxtra, and begun supplying batteries for vehicles, buses, battery-swapping fleets, and increasingly stationary storage.

A Lactec researcher recently told the press that Brazil “has experience at laboratory and pilot scale,” but that moving to production capable of competing with major players “still requires investment” that, in practice, has not arrived.

The analogy used by the researcher is revealing: a future lithium battery plant in Brazil would share 80% to 90% of its production processes with a sodium-ion battery factory. In other words, even for a technology Brazil has discussed for more than a decade, it has not built a domestic supply chain. Why would sodium-ion be different?

This contradiction is most obvious in battery energy storage systems (BESS), where Brazil has one of the strongest market cases. The country is recording record curtailment of wind and solar generation, the Capacity Reserve Auction (LRCAP) is creating a storage market almost from scratch, and the National Electric System Operator (ONS) continues restricting renewable generation because of a lack of transmission capacity and storage.

If there is a domestic market mature enough to justify industrial risk in a new technology, it is Brazilian BESS.

But the path currently taking shape is familiar: the first sodium-ion storage containers to arrive in Brazil will likely come ready-made, with Chinese cells, Chinese integration, and, at best, Brazilian assembly. They will be celebrated as a national achievement – as already happens with LFP – while the parts that create qualified jobs, intellectual property, and margins, namely cell manufacturing, remain on the other side of the Pacific.

This is not industrial xenophobia or a denial of China’s real advantage, built through more than a decade of deliberate industrial policy, subsidies, and scale. It is simply the recognition that natural resource abundance alone is not a competitive advantage in energy storage. Brazil continues to treat the two as if they were the same thing.

Having raw materials and solar resources is geography. Strategy is what is built with them.

Mobility problem

Electric mobility repeats the same pattern on a smaller scale. Changan and GAC Aion are already putting vehicles using Naxtra sodium-ion cells on the road, with claimed ranges of around 400 km and energy density of 175 Wh/kg. This is enough for entry-level cars, urban buses, and light commercial vehicles – precisely the segments growing fastest in Brazilian transport fleets.

Brazil already assembles electric buses with some local expertise, including exports to neighboring countries, but the cell is once again imported. Replacing lithium cells with sodium cells inside a bus assembled locally does not change the dependence equation; it only changes the Chinese supplier from one chemistry to another.

Brazil does not need to invent sodium-ion technology from scratch – that race already has a defined leader, and it does not speak Portuguese. The country needs to use the window that still exists between 2026 and full market maturity around 2028-2029 to negotiate technology transfer, cell manufacturing joint ventures, and local content requirements linked to BESS auctions under LRCAP.

Other countries took similar approaches with solar panels and are now trying, too late, to do the same with lithium batteries. The difference between repeating the mistake and learning from it is making decisions before the market closes, not after China has captured the entire supply chain and Brazil discovers in 2030 another optimistic report about “potential” that never became a factory.

Sodium-ion is, in fact, a promising chemistry for Brazil: low-cost, safe, tolerant of heat and cold, and suited to the country’s generation profile and curtailment challenges. But geological potential without industrial policy is just a beautiful paragraph in a consultancy report.

The question is not whether sodium-ion batteries will reach Brazil – they will, packaged, with a translated manual – but whether Brazil will discuss where they are manufactured before simply celebrating that they have arrived.

The views and opinions expressed in this article are exclusively those of the author and do not necessarily reflect those of pv magazine.

From pv magazine Brazil