With the development of flexible electronics, wearable electronic devices are rapidly entering people's lives. In order to realize the productization of the wearable device, the energy supply components thereof also need to be flexible and have 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, the supercapacitor has a higher energy density than a conventional parallel plate capacitor, and its power density and service life are superior to those of a lithium ion battery, and thus has been widely studied. However, after the ultracapacitor is subjected to bending deformation, the polymer electrolyte layer is maintained well, the structure of the electrode material is often destroyed, and the energy storage characteristics are reduced. The lack of mechanical properties of electrode materials severely limits the application of ultracapacitors in the field of flexible wearables. Therefore, the development of flexible supercapacitors with both mechanical and energy storage characteristics still faces enormous challenges.
Recently, the Chen Wei Group, a researcher at the International Laboratory of the Suzhou Institute of Nanotechnology and Nanobionics, Chinese Academy of Sciences, designed and fabricated a porous carbon material with MOF structure, and based on this material, successfully built a flexible structure that combines both mechanical flexibility and high energy storage properties. Super capacitor. The team first grew the MOF material in situ on the surface of the carbon nanotubes, and then used a high temperature annealing process to obtain a MOF porous carbon material. This new material has high nitrogen-doped (17.82%), high specific surface area (920m2g-1), narrow pore distribution (2.5 nm), and high conductivity (278 S m-1). From the structural design point of view, carbon nanotubes not only improve the conductivity of the material, but also gives continuity and flexibility to the material; on the other hand, the MOF structure plays a role in adsorbing and containing ions. Studies have shown that the specific capacitance of the new material measured in the water system is as high as 426F g-1, and the performance does not decay after 10,000 cycles. The team used a polymer interpenetrating network/ionic liquid electrolyte layer to further assemble a flexible thin-film supercapacitor with the electrode. Experiments have shown that after the device is subjected to distortions such as twisting, stretching, and folding, the performance is maintained well and the operation is stable. In the wearable device, The field has important application value. Related results have been published in Advanced Functional Materials, 2017, 27, 1606219.
This work was supported by the National Natural Science Foundation of China, the Outstanding Youth Natural Science Fund of Jiangsu Province, the Special Cooperation Program of Hong Kong, Macao, and Taiwan of the Ministry of Science and Technology, and the Major Scientific Research Plan of the Ministry of Science and Technology.
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