High specific surface area coal-based nitrogen-doped activated carbon sphere electrode material and preparation method thereof

Abstract

The invention relates to the technical field of electrode materials for supercapacitors, and discloses a high specific surface area coal-based nitrogen-doped activated carbon sphere electrode materialand a preparation method thereof. The high specific surface area coal-based nitrogen-doped activated carbon sphere electrode material is prepared according to the steps of enabling pulverized coal tobe reacted with a strong oxidant solution, performing hydrothermal reaction on obtained oxidized coal and glucosamine, mixing a powdered product obtained by washing and drying to obtain with potassium hydroxide, carrying out carbonization treatment, washing and drying an obtained mixed product to acquire a high specific surface area coal-based nitrogen-doped activated carbon sphere electrode material. According to the invention, the glucosamine is adopted to serve as a nitrogen source, the oxidized coal is adopted to serve as a carbon source, so that the yield of coal-based nitrogen-doped carbon spheres is effectively improved, and the high specific surface area coal-based nitrogen-doped activated carbon sphere electrode material is prepared. The high specific surface area coal-based nitrogen-doped activated carbon sphere electrode material has micro-nano morphology, is uniform in pore structure distribution and has excellent specific capacity and high-current charging and dischargingperformance when serving as a supercapacitor electrode material.

Description

technical field [0001] The invention relates to the technical field of electrode materials for supercapacitors, and relates to a coal-based nitrogen-doped activated carbon ball electrode material with a high specific surface area and a preparation method thereof. Background technique [0002] Supercapacitor is an important new type of energy storage device, which has attracted much attention due to its advantages such as high power density, wide operating temperature range and long cycle life. Activated carbon has always been the first choice for supercapacitors because of its cheap and easy availability, stable chemical properties, and easy adjustment of specific surface area and pore structure. Coal is one of the main raw materials for activated carbon. At present, my country's activated carbon production is about 420,000 tons per year, of which coal-based activated carbon accounts for more than 70% of the total output. Coal-based activated carbon with large specific surf...

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Problems solved by technology

[0004] The present invention provides a high specific surface area coal-based nitrogen-doped activated carbon ball electrode material and its preparation method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of specific capacity and high current charge and discharge of existing supercapacitor electrode materials poor performance problem

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