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Aperture-controllable porous electrode and preparation method thereof

A porous electrode, pore size technology, applied in the preparation/purification of carbon, nanotechnology for materials and surface science, nanotechnology, etc. Electrode film, etc.

Active Publication Date: 2013-09-04
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of this process is high, and the active material content in the electrode film is relatively small, so it is not suitable for the preparation of electrode films for supercapacitors.

Method used

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  • Aperture-controllable porous electrode and preparation method thereof
  • Aperture-controllable porous electrode and preparation method thereof
  • Aperture-controllable porous electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] With carbon nanotubes as the carbon material, PTFE emulsion as the binder, polyethylene glycol 400 as the pore-forming agent, the mass ratio of carbon nanotubes to PTFE is 95:5, and the mass of polyethylene glycol is the sum of the mass of the former two 30% of the above three materials, blend the above three materials, add isopropanol to disperse and stir evenly, prepare wet powder carbon particle materials, and then carry out rolling operation to form electrode sheets with a thickness of 1mm, the surface is dense and uniform, and cut according to the size of battery electrodes Cut and bake in an oven at 180°C for 3 hours. figure 1 is the scanning electron microscope image of the prepared carbon nanotube porous electrode, the average pore diameter of the porous electrode is 0.1-2 μm, and the pore diameter distribution is uniform. The prepared porous electrode has good liquid absorption performance, and the porosity reaches 80%. Take out the porous electrode sheet, ass...

Embodiment 2

[0025] Graphene is used as carbon material, PTFE emulsion is used as binder, polyethylene glycol 400 is used as pore forming agent, the mass ratio of graphene and PTFE is 90:10, and the quality of polyethylene glycol is 40% of the total mass of the former two. %, blend the above three materials, add isopropanol to disperse and stir evenly, prepare wet powder carbon particle material, and then carry out rolling operation to form an electrode sheet with a thickness of 1mm. The surface is dense and uniform, and it is cut according to the size of the battery electrode. Place in an oven and bake at 150°C for 5h. image 3 Scanning electron microscope image of the prepared graphene porous electrode, from image 3 It can be seen that the average pore size of the porous electrode is 10-50 μm, and the pore size distribution is uniform. The prepared porous electrode has good liquid absorption performance, and the porosity reaches 85%.

Embodiment 3

[0027]The mixture of carbon nanotubes and graphene is used as carbon material, the mass ratio of carbon nanotubes and graphene is 3:1, PTFE emulsion is used as binder, polyethylene glycol 400 is used as pore-forming agent, and the mass ratio of carbon materials to PTFE is 95:5, the mass of polyethylene glycol is 40% of the total mass of the first two, blend the above three materials, add isopropanol to disperse and stir evenly, prepare wet powder carbon particle material, and then carry out rolling operation to form a thickness It is a 1mm electrode sheet with a dense and uniform surface, cut according to the size of the battery electrode, and placed in an oven for 3 hours at 180°C. The prepared porous electrode has good liquid absorption performance, and the porosity reaches 83%.

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Abstract

The invention discloses an aperture-controllable porous electrode and a preparation method thereof, and relates to a porous electrode. The aperture-controllable porous electrode consists of carbon materials and is a three-dimensional (3D) network framework thin film; the average aperture is concentrated between 0.1 micron and 5 microns; the thickness of the aperture-controllable porous electrode can be 50 to 0.1mm; and the porosity of the aperture-controllable porous electrode is more than 80 percent. The method comprises the following steps of: blending carbon material powder with an adhesive and a pore-forming agent; adding a dispersing agent, and stirring to be granular to obtain granular wet powder; and repeatedly rolling the obtained granular wet powder into a sheet thin film through a rolling shaft, folding and continuously rolling the sheet thin film until an electrode thin film is molded, and baking to obtain the aperture-controllable porous electrode. The aperture-controllable porous electrode is simple in preparation process, controllable in electrode aperture, low in cost and pollution-free, and can be widely applied to a high-charge-discharge magnification liquid-phase energy storage battery, a dual-electric-layer super capacitor, a fuel battery and other battery types containing the porous electrode as an assembly.

Description

technical field [0001] The invention relates to a porous electrode, in particular to a porous electrode with controllable pore size and a preparation method thereof for a liquid-phase energy storage battery with a high charge-discharge rate. Background technique [0002] With the rapid development of social economy, the situation of resources and environment is becoming more and more severe, and it is urgent to develop clean and efficient forms of energy utilization. Chemical power sources can directly convert chemical energy into electrical energy. They are clean and efficient, and will play an important role in the fields of renewable energy power generation, smart grids, and electric vehicles in the future. The core component of the chemical power source—the electrode determines the performance of the battery. There are many types of electrodes, and different battery systems have different requirements for electrodes. From the perspective of application, porous electrod...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00B82Y40/00C01B32/05
Inventor 董全峰林志彬田昭武郑明森林祖赓林长冲
Owner XIAMEN UNIV
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