Sodium-ion batteries have arrived in a mass-produced car, survived a blowout at –32°C, and matched Tesla’s manufacturing quality in an independent teardown. They are also less than one per cent of world battery production, and the last American company betting on them went bankrupt. The gap between those two facts is the story — and for India, which is about to trade an oil import bill for a battery import bill, it is the most consequential energy question of the decade.
On 5 February 2026, on an icy road in northern China, a black sedan travelling at 95 kilometres an hour blew a tyre. In −32°C air the burst threw up a plume of white smoke; the car coasted to a controlled stop without leaving the road. The stunt was staged, and its purpose was to introduce Changan’s Nevo A06 — the world’s first mass-produced passenger EV powered by sodium-ion batteries, using a second-generation cell from CATL, the largest battery maker on earth.
The demonstration was chosen carefully, because cold is where sodium wins. CATL claims its Naxtra cells retain about 90 per cent of capacity at −40°C, where lithium cells turn sluggish and refuse to charge. Cut one in half, the company says, and it keeps powering a bulb rather than catching fire. After decades of laboratory promise, the “salt battery” is in a showroom.
And yet, in 2025, total global sodium-ion production was less than one per cent of lithium-ion output. Sodium accounts for roughly four per cent of existing and funded battery manufacturing capacity worldwide. The last serious American sodium-ion manufacturer shut its doors in September 2025. Both of these things are true at once, and understanding why is the whole of the story.
Why salt
A sodium-ion battery works exactly as a lithium-ion one does: it shuttles ions between two electrodes. Sodium sits one step below lithium on the periodic table and behaves similarly, so the swap is unusually straightforward — cells can be made on lithium-ion lines with modest retooling.
The attraction is supply. Lithium is mined in a handful of countries, often via evaporation ponds sprawling over thousands of acres, and its price has whipsawed violently. Sodium is effectively everywhere — it is, in the end, salt. Sodium-ion cells also dispense with cobalt and nickel, and use aluminium current collectors rather than copper, which costs three to four times more. They ship safely at zero volts, where lithium cells must hold a charge and therefore a fire risk. They tolerate cold, and resist the thermal runaway that matters enormously for grid installations near communities. Their upstream minerals are also far more geographically diversified than lithium’s.
The physics extracts a price. A sodium atom occupies more than twice the volume of a lithium atom and weighs three times as much. Sodium-ion cells therefore store, by the IEA’s reckoning, up to 40 per cent less energy per kilogram. The gap is narrowing fast — CATL’s Naxtra reaches about 175 watt-hours per kilogram against roughly 185 for lithium iron phosphate (LFP), the workhorse budget chemistry — but a sodium car needs a bigger, heavier pack for the same range. That rules sodium out of long-range luxury EVs, and little else.
The economics that killed a pioneer
Here is where the story turns, and where most coverage of salt batteries goes wrong. The case for sodium was always that it would be cheaper. That case has been ambushed — not by a rival technology, but by lithium itself.
Lithium carbonate prices crashed by 70 to 90 per cent from their 2022 peak as Chinese production expanded and EV growth slowed. Overnight, sodium-ion’s core economic rationale evaporated. Natron Energy, a Stanford spin-out and the most advanced sodium-ion manufacturer in the United States, opened America’s first commercial-scale sodium plant in Michigan in April 2024 with $19.8 million of ARPA-E support, then announced a $1.4 billion, 14-GWh gigafactory in North Carolina. On 3 September 2025 it ceased operations, having raised $363 million over thirteen years. It had $25 million in booked orders it could not convert to revenue while awaiting safety certification. It announced maximum ambition at the moment of minimum opportunity.
The IEA’s assessment is unsentimental: current lithium prices are still not high enough for sodium-ion to undercut LFP in most applications. MIT Technology Review, naming sodium-ion one of its ten breakthrough technologies of 2026, concedes in the same breath that today’s cells are not meaningfully cheaper. Analysts at Benchmark Mineral Intelligence expect no more than 3–4 GWh of sodium-ion demand in North America by the end of the decade. LFP, meanwhile, keeps getting cheaper and denser — a moving target that alternative chemistries must chase. As one battery analyst put it, the bar keeps going up.
But the ground is shifting again. Lithium prices, while still around 70 per cent below the 2022 peak, doubled over the past year. That is precisely the volatility that makes sodium valuable — not as a replacement, but as a hedge. For a giant like CATL or BYD, able to run several supply chains in parallel, sodium-ion expertise is insurance: the ability to switch chemistry rapidly if lithium spikes again. That is a strategic asset available only to those with the balance sheet to build it before it is needed. It is exactly what Natron, a startup with one chemistry and no fallback, could not do.
Where it is actually winning
Strip away the “lithium killer” talk and a clear picture emerges: sodium wins where weight does not matter and cost, safety and cold do.
Grid storage is the natural home. At megawatt-hour scale, energy density per square metre is close to irrelevant, while cost per kilowatt-hour, thermal stability and cycle life dominate. China installed its first sodium-ion grid battery in 2019; CATL launched a storage-specific sodium platform in Beijing this year. In the United States, Peak Energy commissioned a 3.5 MWh sodium system in Colorado in September 2025. General Motors — hardly a speculative outfit — said in June 2026 it is prototyping sodium cells for stationary storage, arguing that where LFP’s gains are plateauing after 25 years, sodium-ion is early on its curve with real headroom.
The technology is also better than sceptics assume. In June 2026, researchers at Aachen led by Moritz Schütte published a teardown of 120 commercial sodium-ion cells from the Chinese maker HiNa in Cell Reports Physical Science. They found manufacturing quality and design comparable to Tesla’s lithium cells — including a tabless, double-aluminium current-collector architecture that lowers resistance and spreads heat evenly, closely resembling Tesla’s own. This is not a laboratory curiosity. It is a mature industrial product that happens to use a different ion.
The uncertainty is in the forecasts, and it is enormous. Global sodium shipments in 2025 were roughly 9 GWh — up 150 per cent year on year, still under one per cent of the market. IRENA projects 400 GWh of annual capacity by 2030 against demand forecasts ranging from 50 to 600 GWh. A twelve-fold spread in a five-year forecast is not analysis; it is an admission that nobody knows.
The China problem
One fact overshadows the rest. Essentially all sodium-ion manufacturing capacity, current and planned, is in China — and the concentration does not stop at cells. It extends to cathode and anode active materials and their precursors, exactly as it does for lithium-ion.
This is the irony at the heart of the sodium story. The technology is marketed as a route to supply-chain resilience, and its raw materials genuinely are more widely distributed. But raw material abundance is not industrial capability. China is leveraging its lithium-ion dominance — factories, equipment, process know-how, trained engineers — to move first on sodium too. Natron’s collapse, alongside Northvolt’s bankruptcy despite $15 billion of backing, suggests the constraint is not the periodic table. It is the ability to make cells at scale, at yield, at price — which requires not one startup but sustained industrial policy.
What it means for India
For India this is not an abstract debate, because India is on the verge of replacing one import dependence with another.
The numbers are stark. India’s battery cell import dependence remains close to 100 per cent, overwhelmingly from China; about 75 per cent of the lithium-ion batteries in Indian electric vehicles are Chinese. The import bill has risen eightfold, from $384 million in 2019 to over $3 billion in FY2025. Projected demand of roughly 272 GWh by FY2030, met without domestic cells at today’s prices, implies an annual battery import bill above $23 billion — against a crude oil bill of $130–140 billion. The ambition to escape dependence on imported oil risks quietly becoming dependence on imported cells, with a single dominant supplier controlling not the product but the entire value chain.
Meanwhile the demand is real and imminent. The Central Electricity Authority estimates India will need 411.4 GWh of storage by 2031-32, of which 236.2 GWh from batteries. Energy Storage Obligations rise to 4 per cent of supply by 2029-30. Grid-scale storage is expected to leap from under 200 MWh in 2025 to around 5 GWh by the end of this year.
India has genuine sodium-ion assets. Reliance bought the British pioneer Faradion — founded in 2011, the world’s first sodium-ion company — for about $135 million in 2021, completed full ownership in 2024, and intends to deploy the technology at its Jamnagar green energy complex for grid-scale storage and battery packs. KPIT Technologies, working with IISER Pune, transferred its sodium-ion technology to Trentar Energy in February 2025 to build 3 GWh of capacity. Pune’s Rechargion Energy has built cells from indigenous raw materials. KPIT’s Ravi Pandit has made the sharpest strategic case: sodium is right for three-wheelers, buses and last-mile delivery — vehicles where range anxiety is absent and duty cycles are predictable. KPIT’s own study with Bajaj and TVS found auto-rickshaw drivers take three fifteen-minute breaks a day, enough to fully recharge a sodium pack, and a 50 km range per charge delivers 150 km of daily running.
But the uncomfortable truth lies elsewhere, and it is not about chemistry. India’s Advanced Chemistry Cell PLI scheme, launched in October 2021 with an ₹18,100-crore outlay, aimed at 50 GWh of domestic cell manufacturing by 2025. As of October 2025, 1.4 GWh had been commissioned — 2.8 per cent of target, all of it by Ola Electric. Investment reached a quarter of target; against a projection of 1.03 million jobs, 1,118 were created. As of February 2026, not one rupee of incentive had been disbursed. Ola cut its own commitment from 20 GWh to 5; Rajesh Exports never moved past land acquisition. The two bidders with actual battery manufacturing experience, Amara Raja and Exide, lost to first-timers making aggressive domestic-value-addition promises, and went off to build outside the scheme. Among the causes of delay: visa hold-ups for the Chinese technical specialists needed to install the equipment.
That last detail is the whole problem in miniature. Switching from lithium to sodium does not fix a 2.8 per cent delivery rate. Sodium-ion is chemically well suited to India — no lithium, no cobalt, no nickel, tolerant of heat, ideal for the stationary storage and small commercial vehicles that dominate Indian demand. Analysts have accordingly urged targeted PLI extensions and dedicated R&D funding for sodium precisely to cut the strategic risk of lithium dependence. But India built a world-class solar manufacturing sector through a sequenced combination of production incentives, customs protection and an approved-manufacturers list, applied from upstream down. The battery sector has had the incentive without the sequence. The chemistry is the easy part.
The verdict
Sodium-ion is neither the revolution its boosters promise nor the dead end Natron’s collapse might suggest. It is something more useful and less dramatic: a second chemistry, arriving at scale, that changes the strategic calculus even where it does not win on price.
The right way to read it is as portfolio, not replacement. Lithium keeps the long-range cars. Sodium takes the grid, the cold climates, the cheap city runabouts, the three-wheelers and the delivery fleets — and, above all, it takes away lithium’s ability to hold the energy transition hostage during the next price spike. That is worth a great deal even if not a single luxury EV ever runs on salt.
For India, the lesson is sharper still. Sodium-ion offers a rare chance to build a battery industry on materials the country need not beg for. Whether it seizes that chance will be decided not in a laboratory but in a factory — and on the current record, that is the harder problem by a wide margin.
– Srinivas VR Yadavalli
