In a development that consolidates the landscape of next-generation energy storage, TDK Corporation and Gelion plc have entered into a full collaboration agreement. The partnership, which was confirmed in late October 2025, is structured around the joint development of advanced battery technologies that will leverage Gelion’s proprietary sulfur-based cathode active material (CAM). This is not a tentative memorandum of understanding or an exploratory dialogue; the two companies have signed a comprehensive agreement to work together, signalling a concrete commitment to bringing a specific class of battery chemistry closer to commercial reality.
The announcement, made public on 21 October 2025, follows an earlier statement from Gelion on 16 October 2025, in which the company indicated that it had signed a full collaboration agreement with a Tier One battery manufacturer. The subsequent disclosure identified that manufacturer as TDK, a Japan-headquartered global electronics and battery company. TDK is a substantial industrial player, employing over 100,000 people worldwide and operating major manufacturing facilities across Asia, Europe, and the Americas. The company serves a broad range of industries, and its entry into this collaboration underscores the industrial scale and manufacturing capability that will be brought to bear on the development programme.
The collaboration is not limited to the two corporate partners. Gelion’s sulfur battery cathode active material is being advanced with the support of a multi-year collaboration partnership between Gelion and the Max Planck Institute of Colloids and Interfaces (MPI). This scientific institution, based in Germany, is one of the world’s leading research organisations in the field of colloids and interfaces, and its involvement adds a layer of fundamental scientific research to the applied development work that TDK and Gelion will undertake. The multi-year nature of the MPI partnership suggests that the scientific groundwork for the sulfur CAM technology has been, and will continue to be, subject to rigorous academic scrutiny and development.
The agreement brings together three distinct entities with complementary strengths. Gelion, listed on the AIM market of the London Stock Exchange under the ticker GELN, describes itself as a global energy storage innovator. The company’s core contribution to the collaboration is its sulfur battery cathode active material, a technology that has been in development for some time and which is now being positioned for industrial application. TDK brings its vast manufacturing expertise, its global supply chain, and its experience in producing batteries at scale for a wide range of applications. The Max Planck Institute contributes fundamental scientific knowledge and research capability, particularly in the area of materials science at the interface level, which is critical to the performance of battery electrodes.
The announcement was accompanied by a statement from Dr. Yasushi Enokido, the General Manager of the Advanced Products Development Center at TDK. Dr. Enokido expressed the company’s delight at collaborating with Gelion and the Max Planck Institute, and articulated the goal of accelerating the development of practical, high-performance solutions. He framed the partnership as a reflection of TDK’s focus on driving innovation and contributing to a more sustainable future. This statement indicates that the collaboration is viewed by TDK not merely as a commercial opportunity but as part of a broader strategic commitment to sustainability in the energy storage sector.
From a market perspective, the announcement is significant for several reasons. First, it confirms that Gelion’s sulfur-based technology has reached a level of maturity that warrants the attention and investment of a Tier One manufacturer. Second, it demonstrates that TDK, a company with a long history in electronics and batteries, is actively seeking to diversify its technology portfolio beyond the established lithium-ion chemistries. Third, it highlights the continued relevance of academic research institutions in the commercial development of advanced battery technologies, with the Max Planck Institute playing a central role in the scientific advancement of the sulfur CAM.
The collaboration agreement is described as "full," which implies a comprehensive and binding commitment between the parties. While the specific terms of the agreement have not been disclosed, the use of the word "full" suggests that it covers not only research and development but also potentially aspects of manufacturing, commercialisation, and intellectual property. The absence of disclosed financial terms is notable but not unusual for agreements of this nature, where the value is often realised over the long term through the successful development and deployment of the technology.
Product and availability details
The core technology at the heart of this collaboration is Gelion’s sulfur battery cathode active material. This is a material that is used in the cathode of a battery, which is one of the two electrodes through which electrical current flows. The choice of sulfur as the active material is significant because sulfur is abundant, inexpensive, and has a high theoretical energy density. However, sulfur batteries have historically faced challenges related to cycle life, conductivity, and the formation of intermediate polysulfide species during charge and discharge. These challenges have limited the commercial viability of sulfur-based batteries, despite their theoretical advantages.
Gelion’s CAM is being developed to address these challenges. The material is being advanced with the support of the Max Planck Institute of Colloids and Interfaces, which brings deep expertise in the behaviour of materials at the nanoscale and at interfaces. This is particularly relevant to battery technology, where the performance of a battery is often determined by the interactions at the interface between the electrode material and the electrolyte. The multi-year collaboration between Gelion and MPI is designed to overcome the scientific hurdles that have historically prevented sulfur batteries from achieving their full potential.
The collaboration between TDK and Gelion is intended to develop battery technologies that utilise this sulfur CAM. The agreement does not specify a particular product or application, and the announcement is notably silent on the specific form factor, capacity, or target market for the batteries that will result from this collaboration. This is consistent with an early-stage development agreement, where the focus is on proving the technology and scaling it up, rather than on specific product launches.
What is known is that the collaboration is multi-year in nature. This suggests that the development timeline is expected to be measured in years rather than months, which is typical for advanced battery technologies that require significant research, testing, and validation before they can be brought to market. The involvement of TDK, with its extensive manufacturing infrastructure, suggests that the ultimate goal is to produce these batteries at industrial scale, but the announcement does not provide a timeline for when such production might begin.
The announcement also does not disclose the specific applications that TDK and Gelion are targeting. TDK serves a wide range of industries, including consumer electronics, automotive, industrial, and energy. The sulfur battery technology could, in principle, be applied to any of these sectors, but the announcement does not specify which ones are the initial focus. This lack of specificity is not unusual for a development-stage collaboration, where the technology may be applicable to multiple markets and the partners may be exploring several options in parallel.
It is also worth noting that the announcement does not provide any details on the performance characteristics of the sulfur CAM, such as its energy density, cycle life, or charging speed. These are critical parameters for any battery technology, and their absence from the announcement suggests that the technology is still in the development phase and that these metrics have not yet been finalised or disclosed. The partners have not provided any target specifications, and it would be premature to speculate on the performance of the final product.
The availability of any products resulting from this collaboration is therefore not yet known. The announcement is a statement of intent and a commitment to development, but it does not provide a roadmap for commercialisation. Readers should not expect to see sulfur-based batteries from TDK and Gelion on the market in the near term. The development timeline is likely to be measured in years, and the path from laboratory research to commercial product is often long and fraught with technical challenges.
What it means for buyers
For buyers and end-users of battery technology, this announcement is a signal that the industry is continuing to diversify beyond the dominant lithium-ion chemistry. Sulfur-based batteries have long been touted as a promising alternative due to the low cost and abundance of sulfur, as well as its high theoretical energy density. If Gelion’s CAM and the collaboration with TDK can overcome the historical challenges of sulfur batteries, the result could be a new class of batteries that are cheaper and potentially more energy-dense than current offerings.
However, it is important for buyers to maintain realistic expectations. The announcement is a development-stage agreement, and there is no indication of when, or even if, a commercial product will emerge. The history of battery technology is replete with examples of promising chemistries that failed to make the transition from the laboratory to the factory floor. Sulfur batteries, in particular, have been the subject of research for decades, and while progress has been made, the technology has yet to achieve widespread commercial adoption.
For buyers who are currently sourcing batteries for consumer electronics, electric vehicles, or grid storage, this announcement should not be read as an immediate alternative to existing products. The collaboration between TDK and Gelion is a long-term bet on a specific technology, and the outcomes will only become clear over a period of years. Buyers should continue to monitor the progress of this collaboration, but they should not make procurement decisions based on the expectation that sulfur batteries will be available in the near term.
The involvement of TDK is a positive signal for the technology’s prospects. TDK is a major manufacturer with deep experience in producing batteries at scale. The company’s willingness to enter into a full collaboration agreement suggests that it sees genuine potential in Gelion’s sulfur CAM. However, TDK’s involvement also means that the technology will be subject to the rigorous standards of a Tier One manufacturer, which includes extensive testing, validation, and qualification processes. These processes take time, and they are not a guarantee of success.
The role of the Max Planck Institute in the collaboration is also noteworthy. The involvement of a leading academic institution adds scientific credibility to the project and suggests that the fundamental science behind the sulfur CAM is sound. However, academic research is not the same as commercial production, and the translation of scientific discoveries into manufacturable products is a complex and uncertain process.
For buyers who are interested in the sustainability aspects of battery technology, the announcement may be of particular interest. Sulfur is an abundant and inexpensive element, and sulfur-based batteries have the potential to be more environmentally friendly than lithium-ion batteries, which rely on materials such as cobalt and nickel that are associated with significant environmental and ethical concerns. TDK’s statement about contributing to a more sustainable future suggests that the company sees the sulfur technology as part of its sustainability strategy. However, the announcement does not provide any specific data on the environmental footprint of the sulfur CAM or the batteries that would be produced from it.
In terms of pricing, it is impossible to provide any estimates for the cost of batteries that might result from this collaboration. The announcement contains no pricing information, and any figures would be pure speculation. Buyers should be aware that new battery technologies often command a premium when they first enter the market, and that cost reductions typically come only with scale and manufacturing experience.
The announcement also raises questions about supply chain implications. TDK’s manufacturing facilities are spread across Asia, Europe, and the Americas, and the company has the capability to produce batteries at multiple locations. However, the announcement does not specify where any future production of sulfur batteries would take place. This is a detail that will likely be clarified as the collaboration progresses, but for now, it remains unknown.
For buyers who are considering incorporating new battery technologies into their products, the key takeaway from this announcement is that the industry is evolving, but that evolution takes time. The collaboration between TDK, Gelion, and the Max Planck Institute is a significant step forward for sulfur battery technology, but it is not a signal that the technology is ready for prime time. Buyers should continue to monitor developments, but they should plan their product strategies based on the technologies that are available today, not on those that may become available in the future.
The announcement also serves as a reminder of the importance of fundamental research in the development of new technologies. The involvement of the Max Planck Institute highlights the role that academic institutions play in advancing the state of the art in materials science. Buyers who are interested in the long-term trajectory of battery technology would be well advised to pay attention to the research coming out of institutions like MPI, as this research often lays the groundwork for the commercial products of the future.
In summary, the collaboration between TDK and Gelion is a notable development in the field of energy storage, but it is a development that will take time to bear fruit. Buyers should view this announcement as a positive sign for the future of battery technology, but they should not expect immediate changes to the products and prices that are available in the market today. The path from laboratory to market is long, and the outcome of this collaboration will only become clear in the years to come.
Sources
https://markets.ft.com/data/announce/detail?dockey=600-202510210200PR_NEWS_EURO_ND__EN02264-1
Published by Vigla Media OÜ (Estonia).