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Preparation method of porous carbon electrode

A porous carbon electrode and carbon black technology, which is applied in electrode manufacturing, capacitor electrodes, capacitor parts, etc., can solve problems such as uneven pore size distribution, and achieve easy control of pore size and porosity, lower production costs, and high discharge capacity. Effect

Inactive Publication Date: 2012-04-18
武汉孚安特科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of uneven pore size distribution in the preparation of porous carbon electrodes in the prior art, and provide a method for producing porous carbon electrodes with uniform pore size, whose size and porosity can be controlled artificially, and without the need for a cathode catalyst

Method used

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Examples

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preparation example Construction

[0020] The preparation method of the porous carbon electrode provided by the embodiment of the present invention is as follows:

[0021] 1) Fully mix water, polytetrafluoroethylene, carbon black and polymethyl methacrylate microspheres with a particle size of 5-250um to obtain a mixture, in which water, polytetrafluoroethylene, acetylene black and polymethyl The weight ratio of the methyl acrylate microspheres is: 800-1000:100:8:10-50.

[0022] 2) The mixture obtained in step 1 is processed into a desired shape, such as a columnar shape or a diaphragm shape, and then dried and shaped to obtain a carbon electrode.

[0023] 3) Soak the microspheres in step 2 to obtain a carbon electrode until the polymethyl methacrylate microspheres are dissolved, or remove the polymethyl methacrylate microspheres by extractive distillation, and then dry to obtain a porous carbon electrode.

Embodiment 1

[0026] Press water: polytetrafluoroethylene: acetylene black: polymethyl methacrylate microsphere=1000: 100: 8: 20 ratio prepares mixture, wherein the particle diameter of polymethyl methacrylate microsphere is selected 5~25um, Process the mixture and dry it to form a cylindrical carbon electrode, then use chloroform to process the carbon electrode through a secondary cycle extraction distillation method, then dry to obtain a cylindrical porous carbon positive electrode, and assemble it into a carbon-packed AA battery. Its capacitance characteristics are shown in Table 1.

Embodiment 2

[0028] Press water: polytetrafluoroethylene: acetylene black: polymethyl methacrylate microsphere=1000: 100: 8: 20 ratio preparation mixture, wherein the particle diameter of polymethyl methacrylate microsphere selects 25~50um and Two types of 200-250um, of which the weight ratio of 25-50um polymethyl methacrylate microspheres to 200-250um polymethyl methacrylate microspheres is 1.2-5:1; process the mixture and dry it to shape The cylindrical carbon electrode is then soaked in acetone for 1 hour, then dried to obtain the cylindrical porous carbon positive electrode, and assembled into a carbon-packed AA battery. The capacitance characteristics are shown in Table 1.

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Abstract

The invention discloses a preparation method of a porous carbon electrode, which comprises the following steps: adequately mixing water, polytetrafluoroethylene, black carbon and polymethylmethacrylate microspheres with the particle sizes of 5-250 mum, processing the obtained mixture into a needed shape, drying and determining the nature of the obtained mixture, and then, soaking the obtained mixture in a microsphere solvent or removing the polymethylmethacrylate microspheres by utilizing an extractive distillation method, and drying to obtain the porous carbon electrode. The porous carbon electrode prepared by the embodiment of the invention has an aperture and a porosity which are easy to control; further, pore structures are regular and orderly, so that a capacitor adopting the porous carbon electrode has the discharge capacity which is 12%-60% higher than that of a conventional similar container; furthermore, an organic solvent used in the preparation method can be utilized repeatedly and is energy-saving and environment-friendly; and in addition, as no expensive cathodic catalyst is necessary to be added, the production cost is decreased.

Description

technical field [0001] The invention relates to a method for preparing an electrode, in particular to a method for preparing a porous carbon electrode. Background technique [0002] Porous carbon electrodes are often used in supercapacitors and lithium batteries due to a series of advantages such as high temperature resistance, acid and alkali resistance, electrical conductivity, and thermal conductivity. The performance of supercapacitors and lithium batteries using porous carbon electrodes is closely related to the pore size and structure of the porous carbon electrodes. The more regular and orderly the pore structure, the higher the discharge capacity of the capacitor. [0003] The manufacture method of traditional porous carbon electrode is to use organic solvent dehydrated alcohol or isopropanol as solvent and porogen, with polytetrafluoroethylene emulsion as binder, porogen (solvent), binder, cathode After the catalyst is mixed with carbon black, it is processed into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01G9/04
CPCY02E60/12Y02E60/10
Inventor 朱志刚代克兴康常州
Owner 武汉孚安特科技有限公司
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