Sodium-ion Battery materials sit at the center of a new South Korean partnership. EcoPro BM, Soulbrain, and Aekyung Chemical have formed the K-Sodium Alliance to develop a full materials package for sodium-ion batteries. Together, they will combine cathode materials, electrolyte, and hard carbon anode material into one integrated solution. Then, they plan to supply that package to battery makers and automakers.
EcoPro BM announced the alliance on July 26, 2026. The company said it signed a memorandum of understanding with Soulbrain and Aekyung Chemical on July 22 at its headquarters in Ochang, North Chungcheong Province. As a result, the three companies now have a formal platform for joint research, testing, and commercialization.
Sodium-Ion Battery Materials Drive the K-Sodium Alliance
The alliance focuses on three core battery materials. First, EcoPro BM will develop sodium-ion battery cathode materials. It will also work on mass-production technology. Next, Soulbrain will develop electrolyte and related additives. Meanwhile, Aekyung Chemical will develop hard carbon anode material and scale up production technology.
This structure gives each company a clear role. More importantly, it creates a coordinated development model. Battery performance depends on each material. However, the combination of materials also shapes battery life, output, and charging performance. Therefore, the companies will share materials with one another and exchange evaluation results. In turn, they can identify the best-performing combinations faster.
Why Sodium-Ion Battery Materials Matter in 2026
Sodium-ion batteries use sodium instead of lithium as a key raw material. Because sodium is easier to procure, companies can build supply strategies with greater flexibility. In addition, sodium-ion chemistry offers stable cost advantages. It also supports strong low-temperature performance and safety. For that reason, many companies are exploring sodium-ion batteries for energy storage systems and entry-level Electric Vehicles.
These features make sodium-ion technology an attractive area for materials innovation in 2026. As the battery market grows, manufacturers need more than one chemistry option. They also need optimized materials that work well together. Therefore, a packaged materials approach can help shorten development timelines and improve commercial readiness.
Sodium-Ion Battery Materials Package Targets Battery Makers
The K-Sodium Alliance plans to go beyond separate material development. Instead, it aims to offer a bundled materials package. That package will include cathode materials, electrolyte, and hard carbon anode material. This approach can help battery makers test integrated solutions more efficiently. Likewise, automakers can review battery options with a clearer view of performance characteristics.
In South Korea, a complete supply chain for these sodium-ion battery materials is still taking shape. Accordingly, the alliance seeks to build a more connected domestic ecosystem. By linking material design, testing, and scale-up, the three companies can strengthen local battery capabilities. At the same time, they can support future product launches in ESS and affordable EV segments.
EcoPro BM Expands Sodium-Ion Battery Materials Capacity
EcoPro BM has worked on sodium-ion battery cathode materials for the past four years. Today, it operates a pilot production line with annual capacity of 1,000 tons. That experience gives the company a practical base for process development and future scale-up. As a result, EcoPro BM enters the alliance with both research depth and pilot manufacturing capability.
Aekyung Chemical is also expanding its footprint. The company is building a hard carbon anode material pilot line with annual capacity of 1,300 tons. It aims to complete the facility within 2026. Once completed, the line should support pilot-scale validation and production development for sodium-ion applications.
Soulbrain adds another essential piece to the alliance. The company will focus on electrolyte and additives, which play a major role in battery stability and performance. Because electrolyte chemistry must match both cathode and anode behavior, Soulbrain’s work will support the alliance’s goal of optimizing the full material set.
Sodium-Ion Battery Materials Support a Stronger Domestic Ecosystem
The K-Sodium Alliance reflects a broader push to strengthen South Korea’s battery materials value chain. Rather than developing each component in isolation, the partners will coordinate research from the start. Consequently, they can improve material compatibility and speed up evaluation cycles. They can also create a more complete domestic offering for future customers.
Jeong Hyun-soo, head of future technology at EcoPro BM, said sodium-ion batteries offer cost competitiveness and strong low-temperature performance. He added that private-sector technology cooperation can help raise the competitiveness of the domestic industry. His comments underline the alliance’s main goal: build a practical sodium-ion battery materials ecosystem through focused collaboration.
Overall, the new alliance brings together cathode expertise, electrolyte development, and hard carbon anode production under one framework. With pilot capacity of 1,000 tons for cathode materials and 1,300 tons for hard carbon anode material, the partners already have meaningful development infrastructure. Therefore, the K-Sodium Alliance could become an important step in shaping South Korea’s sodium-ion battery materials ecosystem in 2026.
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