Binder used for super capacitor electrode
A technology of supercapacitors and binders, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of poor conductivity of binders, affecting capacitor performance, small activated carbon particles, etc., to improve the scope of application, high adsorption and decolorization ability, and not easy to crack Effect
Inactive Publication Date: 2017-04-19
ANHUI FEIDA ELECTRICAL TECH CO LTD
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Problems solved by technology
At present, the mainstream binders are polyurethane, polyvinylidene fluoride, polyacrylic acid and polytetrafluoroethylene. The active material in the supercapacitor is mainly activated carbon material. Due to the small size of activated carbon particles and low tap density, the adhesion between it and the current collector The junction effect is poor, increasing the amount of binder can solve this problem, but because the binder has poor conductivity, it will affect the performance of the capacitor
Method used
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Embodiment 1
[0008] A binder for a supercapacitor, which is composed of the following materials in parts by weight: polytetrafluoroethylene 2, polyurethane 1, attapulgite 3, graphene 0.2, when the capacitor electrode is homogenized, activated carbon in the electrode slurry: conductive carbon : The ratio of the binder is: 84%: 6%: 10%, and the solid content of the slurry is 25%. The mixture is coated on a current collector to prepare an electrode sheet.
Embodiment 2
[0010] The basic process is the same as that of Example 1, except that a supercapacitor adhesive is composed of the following materials in parts by weight: polytetrafluoroethylene 3, polyurethane 3, attapulgite 5, and graphene 0.3.
Embodiment 3
[0012] The basic process is the same as that of Example 1, except that a supercapacitor adhesive is composed of the following materials in parts by weight: 4 polytetrafluoroethylene, 2 polyurethane, 6 attapulgite, and 0.5 graphene.
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The present invention provides a binder used for a super capacitor electrode. The composition of the binder comprises, by weight, 2-5 of teflon, 1-4 of polyurethane, 3-7 of attapulgite, 0.2-0.6 of graphene, wherein the teflon and the polyurethane separately belong to the binders of the macromolecules and the micromolecules, by mixing the teflon and the polyurethane to use, the bonding strength of the binder and the degree of crystallinity are guaranteed simultaneously. The attapulgite has the very good hydroscopicity and swelling capacity and enables the application range of the binder to be improved very well and the coating not to crack easily, and the graphene has a very large specific surface area, enables the dispersity of the graphene and the coating uniformity to be increased substantially and is very strong in electrical conductivity. By the test verification, the binder provided by the present invention enables the adhesive force and the bonding strength of a coated electrode slice to be improved effectively and the usage performance of a capacitor to be improved, and the electrode slice is not easy to crack and fall powder.
Description
technical field [0001] The invention relates to the field of capacitor electrode binders, in particular to a binder for supercapacitor electrodes. [0002] technical background [0003] A supercapacitor is an energy storage element between traditional capacitors and batteries, also known as electrochemical capacitors or double-layer capacitors. The electrodes of supercapacitors are mainly composed of activated carbon, conductive agents and binders. The binder is mainly used to increase the strength of the electrode and prevent the active material from falling off during the cycle discharge process of the electrode. At present, the mainstream binders are polyurethane, polyvinylidene fluoride, polyacrylic acid and polytetrafluoroethylene. The active material in the supercapacitor is mainly activated carbon material. Due to the small size of activated carbon particles and low tap density, the adhesion between it and the current collector The junction effect is poor, increasing ...
Claims
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Login to View More IPC IPC(8): H01G11/38
CPCY02E60/13H01G11/38
Inventor 胡忠胜华玲萍吴良军
Owner ANHUI FEIDA ELECTRICAL TECH CO LTD