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Preparation method of low-rank coal-based porous carbon and application of low-rank coal-based porous carbon in supercapacitor

A low-rank coal and porous carbon technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, can solve the problems affecting the application range of supercapacitors, complicated processes, and high preparation costs, and can promote the application range and preparation method. Simple and low cost of raw materials

Inactive Publication Date: 2020-09-25
大唐可再生能源试验研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these carbon nanomaterials have good applications in supercapacitors, their preparation costs are high and the process is complicated, which seriously affects the application range of supercapacitors.

Method used

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  • Preparation method of low-rank coal-based porous carbon and application of low-rank coal-based porous carbon in supercapacitor
  • Preparation method of low-rank coal-based porous carbon and application of low-rank coal-based porous carbon in supercapacitor
  • Preparation method of low-rank coal-based porous carbon and application of low-rank coal-based porous carbon in supercapacitor

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Embodiment 1

[0026] The low-cost low-rank coal-based porous carbon preparation method of this embodiment is carried out according to the following steps:

[0027] 1. Raw material refinement

[0028] Crushing, grinding, sieving and drying Zhundong subbituminous coal powder in sequence to obtain 80-100 mesh fine coal powder;

[0029] 2. Preparation of the mixture

[0030] mixing fine coal powder with potassium carbonate by liquid phase impregnation to obtain a mixture;

[0031] The liquid-phase impregnation process is as follows: potassium carbonate is dissolved in water to obtain a potassium carbonate solution, 3g of pulverized coal is mixed with the potassium carbonate solution and placed in a mixer to stir evenly, and the mixture is obtained after drying; the drying temperature is 80°C; the speed of the mixer is 300r / min;

[0032] The mass ratio of described pulverized coal and salt of wormwood is 1:3;

[0033] 3. High temperature activation

[0034] Put the mixture in step 2 in the ...

Embodiment 2

[0044] The low-order coal-based porous carbon obtained in Example 1 is used to prepare a supercapacitor, specifically,

[0045] Electrode preparation: In absolute ethanol, according to the mass ratio of 8:1:1, the selected coal-based porous carbon, conductive carbon black (Super P) and 60wt.% polytetrafluoroethylene emulsion (PTFE) were ground to form a uniform film , dried in a vacuum oven (the drying temperature is 120° C., and the drying time is 12 hours) for later use. Take 2mg of film each time for the preparation of a single pole piece, with an area of ​​about 1cm 2 .

[0046] Symmetrical supercapacitor assembly process: select two pole pieces of the same quality, press them on the sheared nickel foam current collector with a diameter of 1.2cm, and dry them in a vacuum oven (120°C for 12h) as positive and negative electrodes . Use 1mol / LTEA BF4-PC as the electrolyte to assemble an organic capacitor, cut a glass fiber film (model: Whatman) with a diameter of 1.6cm as a...

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Abstract

The invention discloses a preparation method of low-rank coal-based porous carbon with low cost. The coal-based porous carbon with high porosity and graphitization degree is obtained by performing K-based compound high-temperature (900-1200 DEG C) activation treatment on a low-rank coal raw material, and on the other hand, the invention provides the application of the low-rank coal-based porous carbon to the preparation of a supercapacitor. By adopting the scheme, the following advantages that by adopting the low-rank coal raw materials with abundant reserves and low cost, the coal-based porous carbon material with higher porosity and graphitization degree can be obtained by mixing K-based compounds (K2CO3, KOH, K2FeO4 and the like) in a high proportion and carrying out high-temperature activation, cleaning and drying processes; and the coal-based porous carbon material is constructed into the supercapacitor device and shows higher specific capacitance, rate capability and operation stability, can be realized. Compared with a conventional carbon nano material, the coal-based porous carbon material is simple in preparation method and low in raw material cost, is suitable for macro preparation and is beneficial to the promotion of expansion of the application range of the supercapacitor.

Description

Technical field: [0001] The invention relates to a preparation method and application of low-order coal-based porous carbon, in particular to a preparation method of low-order coal-based porous carbon and its application in supercapacitors. Background technique: [0002] With the rapid development of mobile devices, electric vehicles, new energy and other fields, the requirements for energy storage devices are getting higher and higher. Compared with conventional chemical batteries, supercapacitors have the characteristics of long service life, fast charge and discharge rate, and high safety, and are especially suitable for applications with high power density requirements. At present, supercapacitors are mainly divided into two types: electric double layer capacitors with carbon-based materials as electrodes and Faraday pseudocapacitors with transition metal oxides and polymers as electrodes. [0003] Carbon-based electrode materials, especially carbon nanomaterials (graph...

Claims

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Application Information

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IPC IPC(8): H01G11/26H01G11/34H01G11/44H01G11/86
CPCH01G11/26H01G11/34H01G11/44H01G11/86Y02E60/13
Inventor 王丽杰苗继春吴立东郭鹏王娟高德兰
Owner 大唐可再生能源试验研究院有限公司
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