Graphene is a one-atom thick flake of carbon, which is stronger than steel and has better electric conductivity than copper. The scientific and practical potential of the material was recognized by 2010 Nobel Prize. Graphene nanoplatelets are specially treated flakes of graphene several microns in diameter. The platelets can be mixed with other carbon nano-structures in order to design composites with various unique functionalities. Outstanding properties of graphene enable a vast variety of new applications electronics, sensing, energy storage. Particularly, energy storage applications benefit from the unique combination of high surface area and low electric resistivity of graphene-based electrodes.
Like a battery, a supercapacitor is an energy storage device that can store large amount on electrical charge in a small volume. However, unlike a battery, a supercapacitor is that it can go through practically infinite number of charge-discharge cycle without noticeable degradation. Additionally, supercapacitors can generate high discharge currents and can be charged in a short period of time. These properties make supercapacitors are particularly suitable for application than implement frequent and fast charging cycles. For example, energy harvesting is a process of extracting useful electrical energy from mechanical sources, such as vibration. Since the primary energy source is intermittent, an energy storage device is often used in order to deliver continuous electrical power. In this application, a battery would require a frequent replacement, which makes a supercapacitor a better choice. Supercapacitors are also used to store energy that was previously lost during braking of electric trains and hybrid
vehicles or smooth fluctuations of electrical power coming from renewable energy sources, such as solar and wind.
Graphene ESD technology
Graphene ESD is applying its extensive expertise in carbon materials in development of advanced energy storage. Improvement of a supercapacitor performance comes from greater surface area of the electrode and reduced resistance to flow of electrical charges. On can say that graphene material is all surface, therefore it can potentially store very large electrical charge. In order to realize this advantage of graphene we are developing proprietary electrode compositions that deliver ultra-high surface area at low cost. Low electric resistivity of the device is essential to attain high charge and discharge currents without a danger of overheating. Our team of materials scientist is designing electrode-electrolyte pairs that minimize parasitic barriers to the electric charge flow.
Application example: large scale supercapacitor storage: