On April 21, the media learned from the Chinese Academy of Sciences that recently, Chen Wei, a researcher at the International Laboratory of Suzhou Institute of nanotechnology and nanobionics, Chinese Academy of Sciences, has designed and prepared a kind of MOF structure porous carbon material, and has successfully constructed a flexible supercapacitor with mechanical flexibility and high energy storage characteristics based on the material. The team first grown MOF materials on the surface of carbon nanotubes, and then obtained MOF porous carbon materials by high temperature annealing.
The results show that the specific capacitance of the new material is as high as 426fg-1 in water system, and its performance does not decline after 10000 cycles. The team further assembled the flexible thin film supercapacitor with the electrode by using the polymer interpenetrating network / ionic liquid electrolyte layer. Experiments show that the device maintains good performance and stable operation after being subjected to distortion, stretching and folding, which has important application value in the field of wearable devices. The results have been published in the Journal of advanced functional materials.
With the development of flexible electronics, wearable electronic devices are rapidly entering people's lives. In order to realize the production of wearable devices, its energy supply components also need to be flexible and high-performance. Therefore, high-performance flexible energy storage devices will increasingly show their potential market value. As a new type of electric energy storage device, supercapacitor has higher energy density than traditional parallel plate capacitor, and its power density and service life are better than that of lithium-ion battery, so it has been widely studied. However, after bending deformation, the polymer electrolyte layer keeps good, the structure of electrode material is often destroyed, and the energy storage characteristics of supercapacitor decrease. The lack of mechanical properties of electrode materials seriously limits the application of supercapacitors in the field of flexible wearable. Therefore, the development of flexible supercapacitors with mechanical and energy storage characteristics is still facing great challenges.