Solzen Energy is designing a patented world’s thinnest Graphene based ultracapacitor measuring 0.1mm thick. We have branded this robust energy storage technology SolzenX1. What has happened in our technology is that a new set of ultra-powerful, ultra-light, ultra-conductive materials can now be manufactured at scale. It is now essential that new, low-cost and environmentally friendly energy storage systems be implemented, in response to the needs of modern society and emerging ecological concerns. Our technology responds exactly to this ever yearned societal need.
The patented technology we use is based on a combination of microfibers and nanofibers. The microfibers provide scaffolding with high strength and an open structure. The nanofibers drape over the microfibers so the pore size is low and the pore size distribution is narrow, while the porosity is high. Our technology’s cell is underpinned by the chemistry of the following layers;
No metal is utilized in our electrode, instead we use the most conductive material known (Graphene) making it possible to have an extremely thin but highly effective electrode. In combining available graphene materials (graphene oxide and single wall carbon nanotubes) with binders, we achieve an extremely thin highly conductive electrode with an extremely low resistance. (NASA is using similar technology in a different application). Our electrode has shown resistances of 25-50 ohms at 25 um thick.
Electron Storage Layer
This is the most critical component of our Ultra-capacitor. Our technology allows extremely high capacity storage on an extremely thin active layer.
In comparative tests, using commercially available super-capacitors, our technology has shown to have capacity to weight ratio as high as thousand times greater. We are able to activate this by designing the pore size to exactly the size of the electrons we want to store. Our studies have shown that standard activated carbon super capacitors store electrons only in the space that are the same size as the electrons utilized, the rest of the areas act only as channels for the electrons. Therefore, up to 90% of the mass utilized is not used for storage.
Competitors that have tried utilizing Graphene have experienced good results but have seen a radical decline of capacity over cycles due to re-stacking of Graphene back to graphite. We have overcome this problem by combining Graphene with a proprietary component that give rise to an electron storage layer that remain stable and does not degrade over time or cycles. This means that the efficiency achieved is better than ever achieved before, making it possible to compete with lithium ion batteries but with the advantage of nearly unlimited cycles and extremely quick charging times.
Supe-capacitors store ionic charge electrostatically at the interface of high surface area electrodes, such as carbon electrodes, in a liquid electrolyte composition. Efforts to increase the energy density of Super-capacitors have focused mainly on developing higher surface area electrodes and controlling electrode pore size. Energy density of Super-capacitors can also be increased through faradaic mechanisms commonly known as pseudo capacitance, which arises from the introduction of redox active groups through functionalization of the carbon electrode surface or the incorporation of metal oxides.
Despite significant improvements in electrode materials design, most non-aqueous electrochemical capacitors use the same electrolyte compositions: either a mixture of tetraethylammonium tetrafluoroborate (TEABF) in acetonitrile (MeCN) or TEABF4 in propylene carbonate (PC). These electrolyte compositions have a high specific conductivity that minimizes resistive losses and enables capacitors to operate at high power. However, these electrolyte compositions typically exhibit a practical voltage window around 2.7 volts, beyond which the capacitor lifetime is significantly reduced. Because the energy stored in a capacitor increases quadratically with Voltage, extending the electrochemical window of the electrolyte composition could significantly improve the energy density of the capacitor. Accordingly, there remains a continued need for an electrolyte composition that can extend the operating Voltage window of a Super-capacitor.
We have overcome all of these problems by reducing the availability of reactive Hydrogen atoms in an aqueous electrolyte making Voltages of up to 4 Volts per cell possible.