Our Technology

High-power ultracapacitor energy storage solutions based on breakthrough graphene material

Skeleton Technologies Ultracapacitor Cells

What are ultracapacitors?

Ultracapacitors, or supercapacitors as they are also known, are an energy storage technology that offers high power density, almost instant charging and discharging,  high reliability, and very long lifetimes.

Ultracapacitors have been in development for decades but the technology has developed rapidly in the recent years. This development has been driven by advances in nanomaterials - Skeleton Technologies' Curved Graphene is a prime example - the electrification of infrastructure and industry, and increased concerns around fuel efficiency and emissions in the automotive and transportation segments.

Ultracapacitors are now delivering significant economic benefits across a wide range of markets including automotive, grid & renewables, transportation and industrial applications.

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Skeleton Technologies Ultracapacitor Internal View
Skeleton Technologies Production Factory

Ultracapacitors VS batteries

Ultracapacitors have several advances over batteries: practically instant charging and discharging, efficient operation in extreme temperatures, extremely high power, high reliability, and safety. 

The difference comes from the fact that ultracapacitors  store energy in an electric field, rather than in a chemical reaction, like batteries. This is also the reason for the difference in lifetime - ultracapacitors work for 15+ years without maintenance.

Ultracapacitors have very little internal resistance (down to 0,12 mΩ), allowing them to work at close to 100% efficiency. They are also significantly lighter than batteries and generally don’t contain harmful chemicals or toxic metals. 

Batteries and ultracapacitors are complementary technologies: batteries provide energy for the long term while ultracapacitors provide the fast reaction and high power. Together, ultracapacitors and batteries are the future of electrification.

The ideal applications for ultracapacitors are ones that require high power and constant cycling. A good example is for example KERS (Kinetic Energy Recovery Systems), where braking energy is stored and re-used for acceleration or lighting. Another great use case is power quality - even a tiny disturbance of a few microseconds in power quality can lead to tens of millions in damages without ultracapacitors to protect the equipment, infrastructure and grid with immediate response.

Infographic: Ultracap or battery?

Skeleton Technologies - German Manufacturing with a Full Value Chain

curved graphene material

Curved Graphene

At the heart of our ultracapacitors' performance advantage is Skeleton’s nanotechnology research into our patented Curved Graphene. Curved graphene differs significantly from regular activated carbons, which are used by other ultracapacitor manufacturers. 

Read our white paper on ESR

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Skeleton ultracapacitor cells

Ultracapacitor Cells

Skeleton’s SkelCap ultracapacitor series is unique in the world of ultracapacitors. Protected by 11 patent families covering everything from the raw material to the synthesis and production processes, our cells provide up to four times higher power density compared to competition, as well as lower ESR, leading to much better application lifetime. 

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Our products

Industrial Modules

The strengths of the SkelCap ultracapacitors carry over to our SkelMod Modules, used across industries. Standard SkelMod modules come in 51V, 102V, and 170V, and of course we offer the SkelStart Engine Start Module for cranking large diesel engines. Get in touch to discuss custom modules.

Skeleton industrial module
Skeleton energy storage systems

Energy Storage Systems

Skeleton’s SkelGrid energy storage systems are used for example in power quality and industrial UPS applications. SkelGrid systems are complete solutions for pain points that many of our customers have experienced.

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What makes Skeleton's ultracapacitors so competitive?

Energy Density

The use of Curved Graphene is one of the key factors in achieving the superior energy density of our ultracapacitors. SkelCap ultracapacitors have up to two times higher energy density compared to even the most advanced cells produced by our competitors.

Power Density

Curved Graphene boasts electrical conductivity that is almost seven times better than that of regular activated carbons. As a result, the power density of SkelCap ultracapacitors exceeds competitors’ products by a factor of four.

Low Internal Resistance Means High Efficiency

The low internal resistance of our ultracapacitors results in significantly higher efficiency and up to five times less energy being lost as heat. This is also an advantage because cooling systems can be downsized or removed altogether.

Reliability & Long Lifetime

Curved graphene has a high chemical purity, which gives it a significant reliability advantage over activated carbons. The special purification and post-treatment procedures applied to the materials used in SkelCap ultracapacitors result industry-leading lifetimes of 15+ years in many applications.

Fully integrated manufacturing IN GERMANY

High quality & performance energy storage solutions made in Europe

Our ISO 9001 and 14001 certified production facility in Grossröhrsdorf, Germany, is the most modern ultracapacitor factory in the world and largest of its kind in Europe. We are a  qualified supplier to a number of large OEMs and Tier 1 companies around the world.

Ultracapacitor production in Germany

Close to our customers and suppliers

Custom-designed German machinery fills the floor at Grossröhrsdorf, enabling consistently high-quality electrode and calendering process. 
Custom-designed German machinery fills the floor at Grossröhrsdorf, enabling consistently high-quality electrode and ...

The largest ultracapacitor factory in Europe

Silicon Saxony is ideal for energy storage production

Our factory is located in Grossröhrsdorf, Germany, in the heart of a high-tech manufacturing region with high-level infrastructure and skilled workforce. The location in Central Europe is ideal due to its vicinity to customers and suppliers.
Our factory is located in Grossröhrsdorf, Germany, in the heart of a high-tech manufacturing region with high-level ...

The longest coating line in the industry

55 meters of modern ultracapacitor manufacturing machinery

We have invested tens of millions of euros in our production facility to be able to manufacture the best ultracapacitors, modules, and energy storage systems in the world. 

We have invested tens of millions of euros in our production facility to be able to manufacture the best ...

German quality

Each cell, module, and system is carefully tested

Quality and reliability are essential in energy storage and one of key reasons we have decided to manufacture our products in Germany.
Quality and reliability are essential in energy storage and one of key reasons we have decided to manufacture our ...

Module testing at our factory in Germany

Industry-leading quality

Each module is tested carefully before shipping to customers. We offer a number of standard modules for a variety of applications and have the capability to design and manufacture custom modules for our customers' needs.
Each module is tested carefully before shipping to customers. We offer a number of standard modules for a variety of ...

Module assembly

Lead workstations enable fast ramp-up

Our module and systems production capacity can be quickly increased by adding lean workstations. The current nominal capacity for for example a 18-cell 48V system is about 500,000 modules per year for the laser-welding machinery, but will of course increase in parallel with the scale-up of the factory.
Our module and systems production capacity can be quickly increased by adding lean workstations. The current ...