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Composite electrolytic paper for capacitor and preparation method thereof

A technology of electrolytic paper and capacitors, which is applied in the field of capacitors, can solve the problems of size dependence, easy short circuit, and incapable of large anode foil, etc., and achieve the effects of reducing equivalent series resistance, shortening current path, and strong adsorption capacity

Pending Publication Date: 2022-05-03
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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Problems solved by technology

[0004] CN111048315A discloses a method for manufacturing laminated aluminum electrolytic capacitors and capacitors produced by the method. In this technical solution, electrolytic paper is prepared directly on the surface of the anode foil by electrospinning, but the size of the electrolytic paper depends on the size of the anode foil. , cannot be larger than the anode foil, and there is a defect of easy short circuit

Method used

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  • Composite electrolytic paper for capacitor and preparation method thereof

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preparation example Construction

[0045] 1. Preparation of spinning solution

[0046] The high molecular polymer is stirred and dissolved in the solvent at 25-100 DEG C to obtain a spinning solution with a mass fraction of 5-50%.

[0047] In some embodiments, the mass fraction of the spinning solution is 5-40%, for example: 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, and so on. Within this range, with appropriate electrospinning parameters, a porous nanofiber membrane with ideal performance indicators can be obtained.

[0048] The high molecular polymer is at least one of polyacrylonitrile, polyethylene, ethylene-vinyl acetate copolymer, polyimide and polyamide.

[0049] In some embodiments, the polymer is polyacrylonitrile.

[0050] The solvent is at least one of ethyl acetate, formic acid, acetic acid, N,N-dimethylformamide, N,N-dimethylacetamide, toluene and tetrahydrofuran.

[0051] In some embodiments, the polymer is stirred and dissolved in a solvent at 60-80° C. to obtain a spinning solution with a mass f...

Embodiment 1

[0070] Weigh 5kg of polyacrylonitrile into 45kg of N,N-dimethylformamide, fully stir and dissolve at 70°C to obtain a clarified spinning solution with a mass fraction of 10%;

[0071] Transfer the above spinning solution to the electrospinning equipment, put the N-20 type traditional electrolytic paper with a thickness of 20 μm on the collection conveyor belt, set the electrospinning parameters: the positive high voltage is 50kV, the negative high voltage is -50kV, and the spinning The distance is 20cm, the spinning solution supply rate is 1L / h, and the winding speed is 0.75m / min. With the traditional electrolytic paper as the base film, single-sided electrospinning is carried out, and the average diameter of the spun fibers is controlled to be 200nm. A composite electrolytic paper deposited with a porous nanofiber film layer was obtained, wherein the thickness of the porous nanofiber film layer was 10 μm. Finally, the composite electrolytic paper was dried and stored in a bla...

Embodiment 2

[0073] In this example, the difference from Example 1 is: the winding speed is increased to 1.5m / min, the average diameter of the spun fibers is controlled to be 200nm, and a composite electrolytic paper deposited with a porous nanofiber film layer is obtained, wherein the porous The thickness of the nanofiber film layer is 5 μm.

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Abstract

The invention provides composite electrolytic paper for a capacitor and a preparation method of the composite electrolytic paper. The composite electrolytic paper comprises: an electrolytic paper base film; the porous nanofiber membrane layer is deposited on at least one surface of the electrolytic paper base membrane; wherein the porous nanofiber membrane is made of a high-molecular polymer which can resist the temperature of 200 DEG C or above. The invention also provides a preparation method of the composite electrolytic paper. The capacitor comprising the composite electrolytic paper has the advantages of small volume, high specific capacity, small internal resistance, strong voltage endurance capability, good safety performance and the like.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a composite electrolytic paper for capacitors and a preparation method thereof. Background technique [0002] Capacitors are essential electronic components for all electronic circuits, and their downstream markets are very broad. In the past ten years, China's capacitor market has expanded steadily, and its market growth rate is much higher than the global average. Electrolytic paper is one of the three major components of capacitors, and the expansion of the capacitor market will inevitably drive the market demand for electrolytic paper. [0003] As we all know, electrolytic paper is interposed between the cathode foil and the anode foil in the capacitor. On the one hand, it prevents short circuit between the two. On the other hand, its porous structure absorbs a large amount of electrolyte. As the carrier of the cathode, it is an indispensable part of the capacitor. At pr...

Claims

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Application Information

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IPC IPC(8): H01G9/028
CPCH01G9/028
Inventor 胡三元何凤荣董维福陈如祥张新民李健恺杨远博
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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