Researchers developed new materials for supercapacitors, according to a report published on February 7, 2019.
This research was conducted by the researchers from the Tohoku University in Japan. Supercapacitors are rechargeable energy storage devices with various applications. When compared to batteries, it offers advantages such as faster charging and longer lifespans. However, it cannot store large amount of energy.
Scientists have been conducting researches for a long time to find materials that can both operate at high-voltage and remain stable under harsh conditions. Researchers of Tohoku University collaborated with TOC Capacitor Co., a supercapacitor production company, for developing a new material that exhibits extraordinarily high stability under conditions of high voltage and high temperature.
Activated carbons used for electrodes in capacitors have low voltage in single cells, which limits its usage in the capacitors and results in stacking of large number of cells to achieve the required voltage. The new material has higher single-cell voltage, which will reduce the stacking number and devices will be more compact. A continuous three-dimensional framework of graphene mesosponge, which is a carbon-based material containing nanoscale pores was used to make the material. One of the key features of this material is that it is seamless.
Physical properties of the material was found using electron microscopy physical tests such as X-ray diffraction and vibrational spectroscopy techniques. Moreover, researchers demonstrated that the material has excellent stability at high temperatures of 60 °C and high voltage of 3.5 volts in a conventional organic electrolyte. This innovation is expected to be beneficial for the development of highly durable, high-voltage supercapacitors that can be used for various applications.