Hierarchical porous carbon-based composite supercapacitor electrode material and preparation method thereof

Abstract

The invention relates to a preparation method of a hierarchical porous carbon-based composite supercapacitor electrode material. The preparation method comprises the following steps of S1, preparing metal organic framework ZIF-67 nanoparticles; S2, dissolving polyacrylonitrile (PAN) and a pore-forming agent in a solvent, then adding the metal organic framework ZIF-67 nanoparticles prepared in the step S1, performing stirring and dispersion uniformly to obtain a spinning solution, and performing electrostatic spinning on the spinning solution to obtain nano composite fibers; and S3, carrying out pre-oxidation and carbonization treatment on the nano composite fibers to obtain the hierarchical porous carbon-based composite supercapacitor electrode material. Mesopores are left after the pore-forming agent is carbonized and removed, hierarchical pores are formed in a microporous structure generated after ZIF-67 is carbonized, and due to the unique hierarchical porous structure, the material is large in specific surface area and high in conductivity and has excellent specific capacitance and good cycling stability; and the preparation method is high in controllability, wide in applicability to materials, short in technological process, simple and convenient to operate and suitable for controllable preparation of various carbon-based supercapacitor electrode materials.

Description

technical field [0001] The invention relates to a hierarchical porous carbon-based composite supercapacitor electrode material and a preparation method thereof, belonging to the field of supercapacitors. Background technique [0002] Supercapacitors, also known as supercapacitors or electrochemical capacitors, are a new type of green energy storage device between traditional capacitors and batteries. As a new type of green energy storage device, supercapacitors not only have much higher energy density than traditional capacitors, but also have higher power density than batteries. Moreover, supercapacitors have the advantages of short charging time, high charging and discharging rate, long cycle life, no memory effect, and basically no maintenance, etc., and are widely used in military, aerospace, national defense, communication equipment, and electric vehicles. [0003] Electrode materials are the most important components in supercapacitors. Today's research on electrode ...

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Problems solved by technology

However, due to the closed internal structure of these fibers, it is difficult to obtain a large specific surface area and thus cannot provide enough sites for ion adsorption-desorption, which limits the improvement of the specific capacitance of the material.

Porous carbon materials derived from metal-organic framework materials have ultra-high specific surface area and rich pore structure, which can provide a large number of adsorption and desorption sites for ions, and can obtain high specific capacitance, but their poor conductivity will lead to active materials The effective utilization of the reduced, thus limiting the improvement of its high-rate performance

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