Gelion Achieves Key Industry Technical Milestone
Gelion plc has achieved a significant technical milestone by reaching a 4Q areal capacity of approximately 4 mAh/cm² in coin cells with its proprietary cathode active material, Gelion CAM. This breakthrough demonstrates the material's ability to form stable, thicker electrodes, a critical step towards developing high-energy-density sulfur-based batteries for applications like e-aviation and electric mobility. The company's results indicate that Gelion CAM can overcome historical limitations of sulfur loading degradation, supporting higher energy per square centimetre and electrode robustness, which is essential for competitiveness with conventional lithium-ion technology.
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Gelion plc (AIM: GELN), the global energy storage innovator, has achieved a major technical milestone in the development of its next-generation sulfur battery technology. This achievement marks a major step forward in Gelion's roadmap to delivering high-energy-density, low-cost sulfur-based batteries suitable for e-aviation, electric mobility, stationary storage, and other commercial applications.
In this next phase of development, Gelion confirms that its proprietary cathode active material ("Gelion CAM") has crossed the 4Q threshold demonstrating stable cycling with the industry recognised 4Q areal capacity (~4 mAh/cm²) in coin cells, the industry standard platform for evaluating new battery materials. Achieving 4Q is widely regarded as a key milestone for high energy density sulfur cathodes. This demonstrates that Gelion CAM can be processed into thicker, high structural integrity electrodes which provide a critical step towards high energy density performance in large format pouch cells. This is a critical enabler for scaling sulfur-based technology toward commercial grade battery systems.
Building on the successful technology transfer from the Max Planck Institute of Colloids and Interfaces (MPI) and the Gelion CAM scale-up announced in September 2025, recent electrode development work shows that Gelion's proprietary material can maintain mechanical stability and controlled porosity even at increased thickness. Achieving these properties is critical to reaching industrially relevant high-areal-capacity electrodes and represents an important benchmark for competitiveness with conventional lithium-ion technology.
Historically, increasing sulfur loading in battery electrodes has been limited by rapid degradation of thicker electrodes. Gelion's results indicate that its CAM can overcome these limitations, supporting higher energy per square centimetre while maintaining electrode robustness, a key pathway toward smaller, lighter, and higher-energy battery cells.
Achieving 4Q areal capacity is a core technical requirement for large-format Li-S and Na-S cells and directly supports Gelion's energy-density and cost objectives for next-generation sulfur-based batteries.
Key Highlights:
| · | 4Q Achieved in Coin Cells: Gelion has successfully reached its 4Q areal-capacity target in coin-cell testing, the industry-recognised standard for evaluating advanced battery materials. 4Q is widely recognised as a critical milestone for practical high-energy-density sulfur cathodes . |
| · | Clear Technical Progress Toward Pouch Cells : The coin-cell results provide strong evidence supporting the translation of Gelion's CAM into large-format pouch-cell electrodes capable of meeting 4Q performance targets. |
| · | Improved Electrode Quality and Consistency: Recent work demonstrates enhanced uniformity, improved adhesion, and reproducible slurry rheology, all compatible with scale-up for larger-format electrodes. |
| · | Enabling Future High Energy Density Targets: This milestone strengthens Gelion's roadmap toward high-energy-density, low-cost sulfur-based batteries suitable for e-aviation, electric mobility, stationary storage, and other commercial applications. |
John Wood, CEO of Gelion, commented: "Achieving 4Q areal capacity in coin cells marks a major validation of our sulfur cathode platform and represents a key technical milestone for Gelion. In the battery industry, 4Q is widely recognised as an important benchmark for high-energy-density sulfur cathodes, and these results give us strong confidence that our sulfur CAM can progress toward delivering the same performance in pouch-cell formats. As we continue refining electrodes for larger format manufacturing, we are building the technical foundation required for prototype development and industry engagement."
Sulfur Batteries
Glossary
| Areal capacity | The amount of charge stored per unit area of electrode surface (mAh/cm²). |
| CAM | Cathode active material |
| Cycle life | The number of full charge and discharge cycles a battery can complete before its capacity falls below a specified level, typically 80% of the original capacity. Higher cycle life indicates longer-lasting performance. |
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