Binding agent for electrode of super capacitor

A supercapacitor and binder technology, applied in capacitor electrodes, capacitor parts, adhesives, etc., to achieve the effects of improving adhesion, flexibility, and compaction density

Inactive Publication Date: 2010-05-19
NANJING SHUANGDENG SCI TECH DEV RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is to overcome the shortcomings of the existing single molecular weight binder, to provide a binder with high adhesion and good wetting and dispersibility, and the electrode slurry prepared by the binder The comprehensive performance of the material is good, and the bonding strength, flexibility and compaction density of the supercapacitor electrode pole piece can be improved.

Method used

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  • Binding agent for electrode of super capacitor

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Experimental program
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Effect test

Embodiment 1

[0020] When performing homogenization of the supercapacitor electrode slurry, polyvinylidene fluoride of two different molecular weights is used as a binder, and N-methylpyrrolidone is used as a solvent. The ratio of activated carbon:conductive carbon:binder in the electrode slurry is 85%:7%:8%, and the solid content of the slurry is 30%. Among them, two kinds of polyvinylidene fluoride with a molecular weight of 350,000 and 700,000 are selected as the binder respectively, which are referred to as binders A and B respectively. Using mass ratios of 10:0, 7:3, 5:5, 3:7, 2:8, 1:9 and 0:10, the two binders were added to the solvent at the same time, stirred and dissolved for gel making, and then mixed with activated carbon, The conductive agent is mixed and homogenized and coated on the current collector to prepare electrode sheets. The bonding strength and maximum compaction density of the pole pieces obtained by testing the above ratios are shown in Table 1.

[0021] It can be...

Embodiment 2

[0025] When performing homogenization of the supercapacitor electrode slurry, two polyacrylic polymers with different molecular weights are used as binders, and water is used as a solvent. The ratio of activated carbon:conductive carbon:binder in the electrode slurry is 87%:8%:7%, and the solid content of the slurry is 26%. Among them, two kinds of polyacrylic acid polymers with molecular weights of 300,000 and 500,000 are selected as the binders, respectively referred to as binders C and D. Two polyacrylic polymer binders with different molecular weights The mass ratios used are 10:0, 7:3, 5:5, 3:7, 2:8, 1:9 and 0:10 respectively, and the two binders are added to the solvent at the same time and stirred to dissolve the glue and then mixed with the powder The materials are mixed and homogenized and coated on the current collector to prepare electrode sheets. The bonding strength and maximum compaction density of the pole pieces obtained by testing the above ratios are shown i...

Embodiment 3

[0031] When performing homogenization of the supercapacitor electrode slurry, two polyethylene oxides with different molecular weights are used as binders, and water is used as a solvent. The ratio of activated carbon:conductive carbon:binder in the electrode slurry is 85%:7%:8%, and the solid content of the slurry is 22%. The experiment was divided into two groups. The blank experiment took 450,000 single-molecular weight polyethylene oxide, and the comparison test took two kinds of polyethylene oxide with molecular weights of 100,000 and 450,000 respectively and a mass ratio of 3:7. The total amount of binder used was equal. The binder is added into the solvent, stirred and dissolved to make a gel, mixed with powder materials such as electrode materials and conductive agents to make a homogeneous slurry, and coated on the current collector to prepare electrode sheets. The bonding strength and cycle performance of the pole pieces obtained by testing the above ratios are show...

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Abstract

The invention discloses a binding agent for an electrode of a super capacitor, which is made of low molecular weight binding agent and high molecular weight binding agent that have different molecular weight, wherein the low molecular weight binding agent has the molecular weight of 10,000-400,000, and the high molecular weight binding agent has the molecular weight of more than 400,000. When in electrode homogenate, by replacing the single binding agent in the traditional method by matching two or more binding agents with different molecular weight for use, the binding agent effectively improves the adhesive force and the adhesive strength of a pole piece of the electrode which is coated, enhances the flexibility of the pole piece, ensures the pole piece not to be easily cracked and fall off powder, and effectively increases the compaction density, thus effectively improving the capacity and the circulation property of the super capacitor.

Description

technical field [0001] The invention relates to a composition of a binder for supercapacitor electrodes. Background technique [0002] In the production and preparation of supercapacitors, the method of making pole pieces is usually to mix and homogenize active materials, binders, conductive agents, solvents, etc., and then coat them on the current collector. The active material of supercapacitor is mainly activated carbon material. Due to the small size of activated carbon particles, large specific surface area and low tap density, the bonding effect with the current collector is poor. The usual solution is to increase the amount of binder. The traditional binder is a single molecular weight binder, which has the following disadvantages: when the molecular weight is low, the bonding strength is not high, and when the molecular weight is high, the crystallinity is not high, which will cause the viscosity to increase. Large, retards wetting and diffusion. If the content of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J127/16C09J133/00C09J171/02C09J127/18H01G9/04
CPCY02E60/13
Inventor 张海林
Owner NANJING SHUANGDENG SCI TECH DEV RES INST
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