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Electrode sheet and its preparation method and capacitor

A technology of electrode sheets and conductive agents, applied in the fields of electrode sheets and their preparation methods and capacitors, can solve problems such as unfavorable process flow, poor mechanical properties of films, and inability to completely remove them, so as to achieve good mechanical properties and improve mechanical properties.

Active Publication Date: 2020-06-23
深圳清研电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used capacitor electrodes generally use electrode materials, conductive agents, binders and one or more processing additives, such as organic solvents, water, plasticizers, etc. to mix uniformly to obtain electrode slurry, and then use coating or extrusion molding The method of preparing the electrode slurry to obtain the electrode sheet, and this method cannot completely remove these processing additives through drying, and chemical interactions between the residues and the electrode material or electrolyte may occur, which may eventually lead to the working life of the capacitor product and the maximum operating voltage becomes smaller
The process of preparing electrode sheets by dry method can avoid the influence of processing additives on the performance of capacitor electrode sheets. However, the electrode sheets prepared by dry method still have poor film mechanical properties, which makes winding difficult, which is not conducive to the subsequent process flow; or A higher content of binder needs to be added, which will also lead to a decrease in the effective capacity and conductivity of the supercapacitor

Method used

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  • Electrode sheet and its preparation method and capacitor
  • Electrode sheet and its preparation method and capacitor

Examples

Experimental program
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preparation example Construction

[0026] The preparation method of the electrode sheet of an embodiment, comprises the following steps:

[0027] S110, mixing the conductive agent, the binder, and the activated carbon to obtain a mixture.

[0028] In one embodiment, the mixture obtained by mixing the conductive agent, the binder and the activated carbon is a dry powder.

[0029] In one embodiment, the conductive agent is selected from at least one of conductive carbon black, graphite, carbon nanotubes, carbon fibers, acetylene black and Ketjen black.

[0030] Further, the average particle diameter of the conductive agent is 30nm-20μm. Wherein, when the conductive agent is conductive carbon black, the average particle size of the conductive agent is 30nm to 100nm, further, the conductive agent is super P type conductive carbon black, and its primary particle size is 40nm; when the conductive agent is graphite, the conductive agent The average particle size is 1 μm to 20 μm.

[0031] Further, the conductive ag...

Embodiment 1

[0064] Weigh a certain weight of conductive agent, binder and activated carbon and place it in a V-type mixer, and mix it for 20 minutes at a stirring speed of 60rpm to obtain a mixture, wherein the conductive agent is conductive carbon black with an average particle size of 40nm, viscous The binder is polytetrafluoroethylene with a weight average molecular weight of 10 million, the average particle size of the binder is 500 μm, the average particle size of the activated carbon is 6 μm, and in the mixture, the mass percentage of the conductive agent is 5%, the viscosity The mass percentage of the binder is 10%, and the mass percentage of the activated carbon is 85%.

[0065] Compressed air is used to carry out jet milling of the mixture, the dew point temperature of the compressed air is -55°C, and the gas flow rate of the compressed air is 300m / s when performing jet milling. Then, an extrusion granulator is used to granulate the air-pulverized mixture, so that the average par...

Embodiment 2

[0067] Weigh a certain weight of conductive agent, binder and activated carbon and place it in a V-type mixer, and mix it for 20 minutes at a stirring speed of 60rpm to obtain a mixture, wherein the conductive agent is conductive carbon black with an average particle size of 40nm, viscous The binder is polytetrafluoroethylene with a weight average molecular weight of 5 million, the average particle size of the binder is 500 μm, the average particle size of the activated carbon is 6 μm, and in the mixture, the mass percentage of the conductive agent is 10%, the viscosity The mass percentage of the binder is 10%, and the mass percentage of the activated carbon is 80%.

[0068] Compressed air is used to carry out jet milling of the mixture, the dew point temperature of the compressed air is -55°C, and the gas flow rate of the compressed air is 300m / s when performing jet milling. Then, an extrusion granulator is used to granulate the air-pulverized mixture, so that the average par...

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Abstract

The invention relates to an electrode plate, a preparation method of the electrode plate and a capacitor comprising the electrode plate. The preparation method of the electrode plate comprises the following steps of: carrying out mixing processing on a conductive agent, an adhesive and activated carbon to obtain a mixture, wherein the mixture is dry powder, the adhesive is selected from polytetrafluoroethylene with a weight-average molecular weight of over 5,000 thousand; carrying out air jet milling on the mixture; carrying out pelletizing processing on the mixture subjected to air jet milling to obtain granules; and carrying out rolling on the granules to obtain the electrode plate. According to the preparation method of the electrode plate, by adopting the adhesive with the ultra-high molecular weight, a firmer cross-linked network can be formed; further, the mixture is firstly subjected to air jet milling and then is subjected to pelletizing to obtain the granules, which is beneficial for preparing the mixture into more uniform granule particles, so that the electrode plate with good mechanical property can be obtained; and the electrode plate does not need to be supported by other supporting materials.

Description

technical field [0001] The invention relates to the technical field of capacitor preparation, in particular to an electrode sheet, a preparation method thereof and a capacitor. Background technique [0002] Double-layer capacitors, also known as supercapacitors, are electrochemical devices that store electrostatic energy in the electrode / electrolyte interface layer, which can store more energy than capacitors made by traditional technologies such as electrolytic capacitors. [0003] Currently commonly used capacitor electrodes generally use electrode materials, conductive agents, binders and one or more processing additives, such as organic solvents, water, plasticizers, etc. to mix uniformly to obtain electrode slurry, and then use coating or extrusion molding The method of preparing the electrode slurry to obtain the electrode sheet, and this method cannot completely remove these processing additives through drying, and chemical interactions between the residues and the el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86
CPCH01G11/86Y02E60/13
Inventor 郑斌黄智钧王臣徐永进袁美蓉罗旭芳杨红平
Owner 深圳清研电子科技有限公司