Why Sodium‑Ion Batteries Are Becoming a Strategic Asset for European Defence

The war in Ukraine has shown how vulnerable modern societies are when energy systems come under attack. Repeated power cuts have made reserve solutions essential for keeping hospitals, communications and other essential services running in below‑freezing temperatures – and proven that batteries and energy storageare now a core component of total defence. Against this backdrop, and with European states heavily dependent on Chinese battery suppliers, now is the time to rethink energy storage to ensure resilience in times of crisis.

Why defence puts extreme demands on batteries

Civil and military defence place tougher demands on energy storage than ordinary grid applications. Systems must withstand physical stress, remain safe in harsh environments, perform across wide temperature ranges and work with as little complexity as possible. Under such conditions, lithium‑ion can quickly become a liability due to its temperature restrictions for charge and discharge.

Sodium‑ion batteries address many of these challenges. They are highly durable, less sensitive to temperature swings and can operate with simpler system requirements. In the field, they deliver electricity without the heatand noise of diesel generators, allowing communications, sensors and other systems to be powered closer to the front without heat signatures.

Geopolitics, China and Europe’s supply‑chain exposure

As trade and supply chains are increasingly weaponised, dependence on a few foreign suppliers for critical technologies like batteries undermines Europe’s ability to act independently in a crisis. Sodium‑ion batteries, unlike many lithium‑ion chemistries, do not rely on rare earths or conflict minerals and can be manufactured from abundant raw materials available in Europe. This means Europe can expand its energy storage capacity even in wartime, significantly increasing resilience.

From buying products to buying capability

To counter Europe’s overreliance on Chinese battery suppliers, defence planners should reconsider how they procure energy storage. As Sweden’s Supreme Commander Michael Claesson has argued, the state can play a key to shoulder commercial risk for scaling up strategically important defence capabilities. Energy storage is a textbook example. By procuring sodium-ion storage as a long‑term resource, rather than buying fixed quantities of batteries, the state can give innovative suppliers the volume commitments they need to invest in production, while ensuring that critical energy capacity is available in a crisis.

A strategic pathway for Europe – powered by sodium-ion

The war in Ukraine has made clear that energy storage is a strategic asset for both civil society and armed forces. Under harsh conditions, sodium‑ion offers distinct advantages: less temperature sensitivity, high durability, simple operation and the potential for a fully European supply chain. For European policymakers and defence planners, the task now is to turn this into real capability – by building energy systems where sodium‑ion is an integral part of the infrastructure. Altris, with its leading sodium‑ion chemistry, stands ready to work with European defence actors to develop that capability and strengthen our shared resilience.

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