Gelion Achieves Key Industry Technical Milestone

Gelion PLC

04 December 2025

 

4 December 2025

Gelion plc
("Gelion", the "Company" or the "Group")

 Technical Breakthrough: Gelion Achieves Target Areal Capacity

Gelion Advanced Sulfur Cathodes Reach Key Industry Milestone in Coin Cells

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."

CONTACTS

Gelion plc   John Wood, CEO   Amit Gupta, CFO	Via Alma
Strand Hanson Limited (Nominated and Financial Adviser)  Christopher Raggett / Rob Patrick	[phone]
Oberon Capital (Joint Broker)  Nick Lovering / Mike Seabrook / Adam Pollock	[phone]
Allenby Capital Limited (Joint Broker)  Jos Pinnington / Lauren Wright (Sales and Corporate Broking)  Alex Brearley / Ashur Joseph (Corporate Finance)	[phone]
Alma Strategic Communications (Financial PR) Justine James / Hannah Campbell / Rose Docherty	[phone] [e-mail]

Market Abuse Regulation

This announcement contains inside information for the purposes of Article 7 of EU Regulation No. 596/2014, which forms part of United Kingdom domestic law by virtue of the European Union (Withdrawal) Act 2018, as amended.

About Gelion

Gelion ("gel: ion") is a global energy storage innovator, supporting the transition to a more sustainable economy by commercialising globally important next generation battery technologies: Sulfur based, Lithium-Sulfur (Li-S), Sodium-Sulfur (Na-S) and Zinc-based (Zn) hybrid cells to electrify mobile and stationary applications and battery recycling technology.

Gelion plc (the Group) is listed on the London Stock Exchange's Alternative Investment Market and wholly owns UK based OXLiD Ltd and Battery Minerals Ltd and Australia based Gelion Technologies Pty Ltd.  Gelion is designing and delivering innovative battery technology to enable that transition and return value for its customers and investors.

In addition, Gelion is also delivering commercial Battery Energy Storage Systems (BESS) projects through its Integration Solutions business.

Sulfur Batteries

Gelion's effort is directed at the potential for sulfur-based cathode active materials (CAMs) to deliver low-cost & sustainable batteries with compelling performance. In the case of Li-S batteries, the target is a high-performance light-weight battery for the EV and e-aviation market. In the case of Na-S batteries, the target is an ultra-low-cost advancement on batteries currently employed in the stationary storage and economy EV market. The company's overarching goal is to help make global transport, energy consumption and storage more sustainable.

Glossary

Ah	Ampere hours. A measure of capacity stored in the cell. The larger the number the higher the capacity.
Areal capacity	The amount of charge stored per unit area of electrode surface (mAh/cm²).
mAh/g(S)	The unit mAh/g(S) stands for milliampere-hours per gram of Sulfur (with S indicating "Sulfur"). It is a measure quantifying how many electrons (in mAh) can be stored per gram of Sulfur.
CAM	Cathode active material
Energy density (Wh/kg)	The ratio of energy stored per unit weight i.e. Watt-hours per kilogram. The higher the number the lighter the battery.
Pouch cell	An industry standard format of a battery which comprises a flat pouch-shaped design with a multi-layered laminate structure.
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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