A research team led by Tohoku University in Japan developed a new supercapacitor material with higher voltage and better stability than other materials. Their research was recently published in the journal Energy and Environmental Science. Supercapacitors are rechargeable energy storage devices with a wide range of applications, from mechanical to smart meters. Compared with batteries, they have many advantages, including faster charging speed and longer service life, but they are not very good at storing large amounts of energy. For a long time, scientists have been looking for high-performance supercapacitor materials to meet the requirements of energy-intensive applications such as automobiles. "It is very challenging to find materials that can work under high pressure and maintain stability under harsh conditions," said Hirotomo Nishihara, a material scientist and author of the paper at Tohoku University in Japan. Nishihara and his colleagues worked with super capacitor production company TOC Capacitor Co. to develop a new material with extremely high stability under high pressure and high temperature conditions. Traditionally, activated carbon is used for the electrodes of capacitors, but they are limited by the low voltage of the single cells constituting the capacitor. This means that a large number of batteries must be stacked together to achieve the required voltage. Crucially, this new material has a higher single-cell voltage, which reduces the number of stacks and makes the device more compact. This new material is a thin sheet made of a continuous three-dimensional frame of sponge in graphene, a carbon-based material containing nanopores. A key feature of this material is that it is seamless-it contains very few carbon edges, which is where corrosion reactions occur, which makes it very stable. The researchers used electron microscopy and a series of physical tests including x-ray diffraction and vibration spectroscopy to study the physical properties of this new material. They also tested commercial graphene-based materials, including single-walled carbon nanotubes, reduced graphene oxide and 3D graphene, using activated carbon as a benchmark for comparison. They show that the material has good high temperature stability at 60 ° C and a voltage of 3.5 volts in traditional organic electrolytes. Significantly, this indicates ultra-high stability at 25 ° C and 4.4 volts, 2.7 times that of conventional activated carbon and other graphene materials. "This is a world record for the voltage stability of carbon materials in symmetric supercapacitors," Nishihara said. This new material paves the way for the development of high-endurance high-voltage supercapacitors, which can be used in many applications, including motor vehicles. Balanced Flowmeter,Balanced Flow Meter,Balancing Valve Flow Meter,Throttling Device Jingsu Huaerwei Science and Technology Group Co.,Ltd , https://www.hewflowmeter.com
The energy density of the new supercapacitor material is 2.7 times higher than traditional materials!