Sodium-ion: a different chemistry, but so far the same geography

On the IEA’s own evidence, the chemistry has diversified and the geography has not.

Source base: International Energy Agency.

The IEA describes sodium-ion batteries as an emerging player in battery markets offering opportunities to diversify battery chemistries and supply chains. That is a statement about opportunity rather than a finding that diversification has occurred, and across three 2026 publications the IEA sets out where the supply chain actually stands. On its own evidence, the chemistry has diversified and the geography has not.

Supply Chain Maturity

In Global EV Outlook 2026, the IEA states directly that global supply chains for sodium-ion batteries are far less developed than for lithium-ion batteries, and that this limits the near-term prospect of large-scale deployment.

That statement covers two distinct things: the materials feeding the cells, and the plants building them. The IEA addresses both, and on its own evidence the picture is consistent across the two.

The Anode: Hard Carbon In Place Of Graphite

The IEA’s illustration of the maturity gap is the anode. It identifies hard carbon as the anode active material used in sodium-ion batteries in place of graphite, and describes its supply chain as poorly developed today and largely concentrated in China. The word “today” is the IEA’s, and the sentence describes a current position rather than a projection. The IEA presents hard carbon as an example of an underdeveloped supply chain; it does not rank the anode against other material changes, and neither do we.

The material being displaced is itself concentrated at the refining stage. In Global Critical Minerals Outlook 2026, the IEA states that for gallium, graphite, manganese and rare earths, the top refiner, China, accounts for over 90% of global supply. One scope note matters here: that figure appears inside a risk framework the IEA built to assess materials essential for high-tech, aerospace and defence applications, where supply concentration across mining and refining is the first of several risk dimensions. It is an IEA statement about graphite, but it is not presented as part of a battery-specific analysis.

The cathode is not a like-for-like substitution either. In its February 2026 commentary, the IEA states that while sodium-ion batteries do not require lithium and graphite, the sodium-ion chemistries closest to commercial deployment depend on other critical minerals including nickel and manganese, whose processing it describes as highly concentrated geographically. The IEA characterises the claim that sodium-ion reduces reliance on critical minerals and diversifies supply chains as only partially accurate.

Cell Manufacturing Capacity

The IEA reports that current sodium-ion battery cell manufacturing capacity is equal to just over 1% of that of lithium-ion cells, and that announced projects for 2030 amount to only about 7% of the committed lithium-ion manufacturing capacity for the same year.

Two qualifications apply, and readers relying on these figures should note both.

1. The IEA does not state the capacity basis in the sodium-ion sentence itself. Elsewhere in the same chapter it reports lithium-ion manufacturing capacity on a nameplate basis, so nameplate is the likely convention, but the source does not say so at that point. Treating the ratio as an operational-capacity comparison is not supported.
2. The second comparison sets announced sodium-ion projects against committed lithium-ion capacity. These are different categories of certainty, and the IEA does not define either term there. The 7% figure should not be read as a like-for-like ratio of future capacity.

On geography, the commentary is more specific than the ratios suggest. The IEA states that nearly all existing global sodium-ion manufacturing capacity is located in China, and that China accounts for more than 95% of 2030 capacity when installed and announced plants are both counted. It also states that this concentration extends beyond cell production to key components including cathode and anode active materials and their precursors.

Separately, the IEA states that total global sodium-ion production in 2025 was less than 1% of that of lithium-ion technologies.

The Lithium Point

Sodium-ion batteries do not rely on lithium. The IEA states this plainly and draws a consequence for producers: for the largest manufacturers, which can run several supply chains in parallel, sodium-ion expertise and production capacity can act as a hedge against lithium price spikes, allowing a switch if needed.

That is a statement about optionality rather than a general cost verdict. Two IEA cost statements should be read together and neither should be reported alone. The IEA states that at current lithium prices sodium-ion is not competitive with LFP in most applications; it also states that sodium-ion is already cost-effective for electric vehicles and stationary storage in particularly cold climates, a finding it does not condition on lithium prices. Both are dated to early 2026, when the IEA reported lithium prices roughly double their level a year earlier and still around 70% below the 2022 peak. Any cost conclusion drawn from a single point on that curve will date quickly, and readers assessing commercial viability should consult the current IEA analysis directly.

What The Sources Do Not Establish

Two things are worth stating plainly, because they are frequently assumed.

The sources consulted here do not quantify the upstream sodium raw material requirement for sodium-ion batteries, do not identify a specific sodium feedstock, and do not assess whether sodium raw material availability is a constraint. Claims about sodium abundance are common in commentary; none of the IEA material cited here makes one. What the IEA does say about the upstream is narrower and comparative: the mining of the minerals used in sodium-ion battery components is more geographically diversified than for lithium-ion, which it frames as a potential advantage in upstream resilience rather than a resolved one.

The sources do not state whether the current concentration of hard carbon production is a transitional feature of an immature industry or a durable structural characteristic. The IEA describes the position; it does not project it.

Key Takeaways

1. The IEA states that global supply chains for sodium-ion batteries are far less developed than for lithium-ion batteries, and that this limits the near-term prospect of large-scale deployment.
2. The IEA uses the anode as its example: hard carbon substitutes for graphite, and the IEA describes the hard carbon supply chain as poorly developed today and largely concentrated in China.
3. Sodium-ion cell manufacturing capacity stands at just over 1% of lithium-ion capacity on IEA figures. Announced sodium-ion projects for 2030 amount to about 7% of committed lithium-ion manufacturing capacity for the same year.
4. Nearly all existing global sodium-ion manufacturing capacity is in China, which on the IEA’s account also holds more than 95% of 2030 capacity once installed and announced plants are counted.
5. The IEA states that concentration in sodium-ion extends beyond cell production to cathode and anode active materials and their precursors, and that current investment plans suggest China could play a role at least as large as it does in the lithium-ion battery industry.
6. Against that, the IEA states that the mining of the minerals used in sodium-ion components is more geographically diversified than for lithium-ion, which it presents as a potential upstream advantage.
7. Sodium-ion batteries do not rely on lithium, which the IEA identifies as a reason for the largest manufacturers to hold sodium-ion capability alongside lithium-ion.