Recently, the Skolkovo Institute of Technology in Russia and the researchers at the Aalto University in Finland jointly developed a flexible supercapacitor with a single-walled carbon nanotube and an insulating layer made of boron nitride nanotubes. Capacitors can withstand deformation and are characterized by simple manufacturing and long service life. Relevant results were published in the scientific journals of Scientific Reports.
The Russian-Finnish joint research team returned to the “classical†technical route, which is a capacitor structure scheme using “two-electrode + insulation layerâ€. The electrode of the flexible supercapacitor adopts a single layer of carbon nanotubes, and the pore structure of the material can ensure the developed specific surface area of ​​the electrode, thereby increasing the electric capacity thereof, and the material is chemically stable and is a good conductor. The space between the electrodes is filled with boron nitride nanotubes as an insulating layer, and the material has good insulation property, and the thickness of 0.5 mm can ensure the corresponding insulation index requirement, and the material has high strength and good plasticity.
The test results of the flexible supercapacitor test show that the capacitor can still maintain the initial capacitance of 96% after 20,000 times of charge and discharge, and its equivalent internal resistance is low, only 4.6 ohms, and can withstand more than 1,000 tensile tests. The elongation can reach 50%. The supercapacitor is prepared by dry deposition and vapor deposition. The process is simple and the cost is low. It is expected that the flexible supercapacitor will soon enter mass production.
A common capacitor is composed of two electrodes and an insulating layer, and the structure of the supercapacitor is relatively complicated. The space between the electrodes is filled with an electrolyte, and the ion layer formed at the interface between the nominal electrode and the electrolyte functions as an electrode. The rapid development of electronic technology has continuously put forward new performance requirements for capacitors, and the miniaturization of electronic equipment objectively requires miniaturization of capacitors as its important components, which requires continuous improvement and development of new capacitors.
In recent years, people have been keen on flexible notebook computers, which in turn have placed performance requirements on capacitors that can withstand bending and stretching. In this case, the supercapacitor based on the polymer and the electrolyte cannot meet the requirements. First, the physical properties do not meet the requirements and the mechanical strength is low. Second, the specification is large, and the material thickness is generally 0.2 mm. The method of reducing the specification will cause a sharp increase in the internal resistance of the capacitor. In terms of performance indicators, flexible supercapacitors have a broader market space.
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