Super capacitor device containing millet-husk-based porous active carbon material

Abstract

The invention discloses a super capacitor device containing a millet-husk-based porous active carbon material. The millet-husk-based porous active carbon material is prepared by uniformly mixing dried millet husks and an activator, performing carbonization and activation with a microwave device in the protection of an inert gas, adding distilled water to obtained black powder for suction filtration washing till the pH value is 6.4-7, and performing drying to obtain black powder. The black powder is the prepared millet-husk-based porous active carbon material. The millet-husk-based porous active carbon material (an active substance) prepared through the microwave method is mixed with a binder according to a certain mass ratio, distilled water is added for mixing to prepare a thick liquid, and the thick liquid is repeatedly rolled to obtain a sheet electrode material. The electrode material is put on a current collector with the corresponding size, cold pressing is carried out at 1-40 Mpa for 10-200 s, and drying is performed at 120 DEG C to obtain an electrode plate of the super capacitor device. The electrode material in the electrode plate is more than 14 mg per square centimeter. An electrode plate, a membrane, and an electrode plate are assembled into a sandwich structure, then different electrolytes are dropwise added, so that the super capacitor device is assembled.

Description

technical field [0001] The invention provides a supercapacitor device of a millet-based porous activated carbon material, which belongs to the field of electrochemical applications. Background technique [0002] With the depletion of fossil resources and the aggravation of environmental problems, human beings urgently need clean, efficient and sustainable energy, as well as related new energy conversion and storage technologies. The common feature of lead-acid, nickel-cadmium, nickel-metal hydride, and lithium-ion batteries currently on the market is that they have high energy density, but the power density is very low and the charging time is long, so it is difficult to meet the storage requirements for high power density. field of application of the device. Therefore, people expect to develop a new type of green energy storage device with high energy density, high power density and long life. [0003] Supercapacitors, also known as electrochemical capacitors, are a new t...

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Problems solved by technology

However, the activated carbon used in the above patents has poor ability to control the proportion of micropores and mesopores, and its specific capacitance value decays relatively seriously under high current density, so it is not suitable for use under high current operating conditions, and its energy density is low.

Hou Jianhua and others used silk as raw material and used FeCl 3 and ZnCl 2 Graphitization-activation of raw materials, the specific surface area of ​​the obtained activated carbon material reaches 2494m 2 / g, as a capacitor electrode material, it shows good stability and high energy density, but the price of silk is too expensive, and the cost of preparing porous carbon is high (ACS Nano.2015, 9, 2556-2564)

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