面向可穿戴电子设备应用需求的柔性超级电容器的研究
[Abstract]:Supercapacitors, as a new type of energy storage device between conventional electrochemical batteries and conventional capacitors, have high power density, rapid charge and discharge capacity. The advantages of super long cycle life and environmental friendliness have attracted much attention. In order to meet the needs of portable and wearable electronic devices, flexible solid-state supercapacitors have gradually become the focus of research. This thesis focuses on the design, synthesis and fabrication of CNT/MnO2NT,CNT@PPy and AgNW/WO3 composites, and their applications in flexible energy storage devices and flexible chromotropic devices. The main conclusions are as follows: 1. The composite flexible electrode based on CNT/MnO2NT was designed and synthesized. The composite electrode with self-supporting structure not only showed excellent flexibility, but also effectively improved the overall specific capacity of the electrode. When the power density is 13.8 mW/cm3, the energy density of the flexible solid-state supercapacitor can reach 0.45 mWh/cm3.. At the same time, using the high capacity and high flexibility of the device, the prototype of the energy storage watch band of the electronic watch is designed and fabricated. The long time energy supply for the electronic watch is successfully realized, and the application potential of the watch in wearable electronic equipment is shown. PPy, was successfully loaded on the surface of CNT by electrochemical polymerization and formed a stable core-shell structure. Under the influence of this special structure, the synergistic effect between CNT-CNT and PPy resulted in a significant increase in the mechanical strength and electrochemical activity of the composite electrode. The tensile strength reached 16 MPa, and the specific capacity of the CNT electrode was 5.6 times higher than that of the CNT electrode. Finally, a flexible solid-state supercapacitor is successfully fabricated based on the composite electrode. When the current density is 0.05A/cm3, The volume specific capacity of the supercapacitor is as high as 4.9 F / cm ~ 3, and the initial capacity of 95% is retained after 10000 cycles with excellent flexibility and cyclic stability. A new preparation method of high conductive flexible transparent substrate was designed and the AgNW/WO3 composite flexible chromotropic electrode was prepared based on this method. The system characterization tests show that the optical transmittance of the electrode at wavelength of 633 nm can be reduced from 55.9% to 11.8%, and the coloring efficiency of the electrode can reach 80.2 cm2/C; with a specific capacitance of 13.6 mF/cm2. at a sweep speed of 10 mV/s. The successful fabrication of the electrode can effectively promote the development of new flexible energy storage and chromotropic devices.
【学位授予单位】:暨南大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:TM53
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