Salt batteries, also known as sodium batteries, are attracting growing interest in China and around the world. While lithium batteries currently dominate the energy storage market, more and more experts are looking at this emerging technology, which is seen as more sustainable, more cost-effective, and above all less dependent on rare resources.
Why is China investing in salt batteries?
China, as a global leader in battery production, is seeking alternatives to lithium for several reasons: unstable prices, scarcity of materials, the environmental impact of lithium extraction, and geopolitical risks tied to its supply chain.
Sodium batteries, sourced from sea salt or abundant sodium reserves, represent a strategic solution. Sodium is far more widespread than lithium: it can be extracted from sea salt, making it an inexpensive and accessible resource.
What is a salt battery?
A salt battery is a rechargeable battery that uses sodium instead of lithium as its main ion. It works on the same electrochemical principle as lithium-ion batteries, but uses sodium-ion. This change in material brings several notable advantages:
- Sodium is abundant and cheap
- No dependence on lithium-producing countries like Chile or Australia
- Fewer environmental risks during extraction
- Better stability at high temperatures
The advantages of salt batteries over lithium batteries
Beyond their low cost, salt batteries are non-flammable and withstand extreme conditions better. This makes them ideal for stationary applications, such as storing solar or wind energy.
Here's a comparison between the two technologies:
| Criterion | Lithium battery | Salt battery (sodium) |
|---|---|---|
| Cost | High | Low |
| Material availability | Limited | Abundant |
| Thermal stability | Poor | Excellent |
| Environmental impact | Significant | Reduced |
Examples of applications in China
CATL (Contemporary Amperex Technology Co. Limited), the Chinese battery giant, unveiled a next-generation sodium-ion battery in 2023 capable of reaching energy density competitive with lithium batteries.
Pilot projects have been launched in several Chinese provinces, notably to power electric buses or to store solar energy at off-grid stations.
Challenges and outlook
Despite their many advantages, salt batteries are not yet ready to completely replace lithium batteries. They offer lower energy density, which limits their use in long-distance electric vehicles.
However, China continues to invest heavily in research and development to improve the performance of these batteries. Chinese researchers are currently working to integrate innovative materials like graphene to increase the capacity of sodium batteries.
A turning point for the global energy market?
With the global energy transition and the need for large-scale storage solutions, salt batteries could play a key role in the years ahead. China, through its industrial and scientific leadership, could well establish this technology as a global standard.
Moreover, for developing countries, this technology represents a major opportunity, as it requires neither rare resources nor complex technology to produce.
Conclusion
Sodium batteries or salt batteries represent a promising innovation in energy storage. Thanks to their reduced cost, durability and low environmental impact, they could complement, and eventually replace, lithium batteries in many applications.
As China accelerates the development of this technology, the world is watching closely as this shift could reshape the global energy landscape.
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