LeydenJar Technologies

LeydenJar Technologies B.V. is a Dutch deep-tech battery company based in Leiden. Founded in 2016 as a spin-off of the Netherlands Organisation for Applied Scientific Research (TNO), the company develops technologies intended to improve the energy density, manufacturability, and environmental profile of lithium-ion batteries. Its name refers to the Leyden jar, an early electrical capacitor associated with the city of Leiden. The company’s technology originated in work on depositing silicon using plasma processes for photovoltaic applications. Although the original solar-cell application did not achieve the intended commercial result, the deposition approach proved useful for producing silicon-based battery anodes. Silicon can store substantially more lithium than conventional graphite, creating a potential route to higher battery energy density. LeydenJar’s approach is designed to deposit silicon in a way that can reduce production complexity and energy consumption compared with some alternative manufacturing routes. LeydenJar focuses primarily on battery components and manufacturing technology rather than on consumer-facing battery products. Its silicon-anode technology is intended for lithium-ion cells used in several applications, including portable electronics, electric vehicles, and aviation. The company’s commercial proposition is to help cell manufacturers increase energy density while working within industrial battery-production processes. LeydenJar has planned an anode-production facility in Eindhoven, the Netherlands. The facility has been described as requiring an investment of €23 million and as being intended to become ready in 2027. The project represents a step from laboratory and development work toward scaled industrial production in the Netherlands, although the available reference material does not establish final production capacity, customer volumes, or operating results. In October 2025, LeydenJar reached an agreement with Chinese battery manufacturer Highpower Technology concerning the production of batteries incorporating LeydenJar anodes. The batteries were described as being shipped from the Netherlands to China as original-equipment-manufacturer components. This arrangement indicates an effort to combine LeydenJar’s anode technology with an established battery manufacturer’s production and supply-chain capabilities. Publicly available reference material does not provide sufficient information to identify the agreement’s financial terms, exclusivity, volumes, or long-term commercial status.

LeydenJar Technologies was established in 2016 in Leiden as a spin-off of TNO, the Dutch organisation for applied scientific research. The company emerged from research into plasma deposition of silicon for solar-cell applications. That initial application was not successful commercially, but the underlying process revealed a potentially valuable use in rechargeable batteries: forming silicon anodes for lithium-ion cells. The shift toward battery anodes reflected the technical advantages of silicon over graphite. Silicon can accommodate more lithium ions, which gives it the potential to increase the amount of energy stored in a battery of a given size or weight. At the same time, silicon-anode development has historically involved challenges such as material expansion during charging and discharging, cycle-life degradation, and the need for scalable manufacturing. LeydenJar’s work has focused on a plasma-deposition approach intended to address the manufacturing side of the problem while enabling higher anode performance. The company’s resulting technology is aimed at the broader lithium-ion battery value chain rather than at a single finished-device market. Potential applications identified for the technology include consumer electronics, electric vehicles, and aircraft. In this model, LeydenJar supplies or licenses anode technology and participates in industrial cell-production arrangements, while battery manufacturers integrate the anodes into cells and finished battery systems. A significant development in the company’s industrialization plans was the proposal for an anode-production facility in Eindhoven. The facility was associated with a planned investment of €23 million and an intended readiness date of 2027. The project signaled an effort to move beyond research and development toward domestic European production of advanced battery components. The available references do not establish whether the facility had reached full construction, commissioning, or commercial operation. In October 2025, LeydenJar announced an agreement with Highpower Technology, a Chinese battery manufacturer. Under the arrangement, batteries using LeydenJar anodes were to be produced and shipped from the Netherlands to China as OEM parts. The agreement connected LeydenJar’s component technology with an established battery producer and indicated an international commercialization route. The available source material does not disclose the agreement’s financial value, production scale, customer names, or exclusivity terms. The company’s identity is closely linked to Leiden. Its name is derived from the Leyden jar, an eighteenth-century electrical storage device invented in Leiden. LeydenJar therefore combines a local historical reference with a modern focus on electrochemical energy storage. It remains a specialist battery-technology company rather than a mass-market consumer brand, and publicly available material provides limited information about its management, ownership, revenue, and operating performance.

• 2025

  Agreement with Highpower Technology

  [1]LeydenJar Technologiesen.wikipedia.org

  LeydenJar reached an agreement with Highpower Technology to produce batteries using LeydenJar anodes for shipment from the Netherlands to China as OEM components.

• 2016

  Company founded as a TNO spin-off

  [1]LeydenJar Technologiesen.wikipedia.org

  LeydenJar Technologies was founded in Leiden as a spin-off of TNO, the Dutch organisation for applied scientific research.

• Research redirected from solar cells to battery anodes

  [1]LeydenJar Technologiesen.wikipedia.org

  A plasma-based silicon-deposition process originally investigated for photovoltaic applications was adapted for silicon anodes in lithium-ion batteries.

• Planned Eindhoven production facility

  [1]LeydenJar Technologiesen.wikipedia.org

  The company planned an Eindhoven facility for anode production, with a reported investment of €23 million and an intended readiness date in 2027.

A Dutch deep-tech developer positioned around silicon-anode innovation, higher-energy-density lithium-ion batteries, and lower-complexity battery manufacturing.

• Battery component

  Silicon anodes

  LeydenJar develops silicon-based anodes for lithium-ion batteries. Silicon offers a substantially higher theoretical lithium-storage capacity than graphite, potentially allowing cells to store more energy without a proportional increase in size or weight. LeydenJar’s process uses plasma deposition and is intended to support a less complex and less energy-intensive production route. The anodes are aimed at integration by battery manufacturers rather than direct sale as finished consumer products.

• Battery technology

  Lithium-ion battery technology

  The company’s broader offering consists of technologies for lithium-ion batteries incorporating its silicon-anode approach. Potential application areas include portable electronics, electric vehicles, and aviation. The proposition is to improve energy density while maintaining a pathway to scalable cell manufacturing through partnerships or production arrangements with battery makers.

• 2025

  International production agreement with Highpower TechnologyStrategy

  Background

  LeydenJar sought to commercialize its silicon-anode technology through cooperation with a battery manufacturer.

  Action taken

  In October 2025, LeydenJar agreed with Highpower Technology on production of batteries incorporating LeydenJar anodes, with the batteries to be shipped from the Netherlands to China as OEM parts.

  Aftermath

  The agreement created an international manufacturing and distribution route for batteries using LeydenJar technology. The available source does not report financial terms, volumes, or subsequent operating results.

  Source

• Redirecting plasma-deposition research toward battery anodesStrategy

  Background

  The company’s original work concerned plasma deposition of silicon for solar cells, but that application did not succeed. The process showed promise for producing silicon anodes for lithium-ion batteries.

  Action taken

  LeydenJar shifted its technical and commercial focus from photovoltaic materials to advanced battery-anode technology.

  Aftermath

  The shift became the foundation of LeydenJar’s battery business and its work on higher-energy-density cells.

  Source

• Planned investment in Eindhoven anode productionStrategy

  Background

  To support the transition from technology development to industrial-scale component manufacturing, LeydenJar planned a production facility in Eindhoven.

  Action taken

  The company planned to invest €23 million in an Eindhoven facility intended to produce battery anodes and be ready in 2027.

  Aftermath

  The plan represented a move toward European production capacity, but the available reference does not confirm completion, commissioning, or commercial output.

  Planned investment. EUR 23 million (Planned facility intended for readiness in 2027)

  Source

1. 1LeydenJar Technologiesen.wikipedia.org
2. 2LeydenJar Technologies official websiteleyden-jar.com