A kind of electrode sheet and its preparation method and application

An electrode sheet, aluminum foil technology, applied in circuits, capacitors, electrical components and other directions, can solve the problems of limited contact area between ruthenium oxide and electrolyte, restricting the high-frequency performance of solid aluminum capacitors, and limiting the application of ruthenium oxide's superior performance, etc. The effect of utilization and electrode performance, high energy density, high capacitance

Active Publication Date: 2022-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ruthenium oxide is expensive and poorly dispersed as an electrode material alone, and the contact area between ruthenium oxide and electrolyte is limited, which limits the superior performance of ruthenium oxide and its application in industrial production.
[0005] Composite carbon materials directly contact carbon ions to generate bonds and thereby reduce the surface resistance of carbon aluminum foil and increase adhesion, but only adding composite carbon materials to prepare solid aluminum negative electrode foil adhesion and specific capacity at high frequencies can only be improved within a certain range. Restricting the High Frequency Performance of Solid Aluminum Capacitors

Method used

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  • A kind of electrode sheet and its preparation method and application
  • A kind of electrode sheet and its preparation method and application
  • A kind of electrode sheet and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Product 1:

[0071] The percentages of each substance in the electrode sheet are: 60% of activated carbon, 5% of acetylene black, 10% of graphite powder, 20% of ruthenium oxide powder, and 5% of binder.

[0072] 1) Preparation of ruthenium oxide ultrafine powder:

[0073] Add ruthenium trichloride to 50% ethanol in proportion at room temperature, stir for 1 h to form a uniform solution, and add 0.2 mol / L ammonium bicarbonate dropwise to neutralize under stirring conditions, and control the pH at the end point of the titration to 7. Obtain a colloidal solution and dry it at 200° C. for 3 hours to obtain an amorphous ruthenium oxide powder with a suitable crystal water content.

[0074] 2) Preparation of composite carbon slurry:

[0075] Put the activated carbon powder into the electric drying oven, heat it at 120°C for 2 hours for drying treatment; dissolve 0.02g of the binder added by the organic solvent and continue stirring with a magnetic stirrer for 4 hours, then ...

Embodiment 2

[0107] Product 1:

[0108] The percentages of each substance in the electrode sheet are: activated carbon 75%, acetylene black 5%, graphite powder 10%, and binder 10%.

[0109] 1) ruthenium oxide precipitated aluminum foil;

[0110] The cathode foil used in the experiment is aluminum foil (light foil) (w (Al) ≥ 99.9%), the thickness is 50 μm, and the size of the aluminum foil is 10mm×50mm; after the aluminum foil is soaked in 10% NaOH solution at 60°C for 15 to 30 seconds , rinse with water, dehydrate with absolute ethanol / acetone, and dry with cold air;

[0111] Select ruthenium trichloride (RuCl3) 5mol / L, potassium chloride (KCl) 0.1mol / L and hydrochloric acid (HCl) 0.01mol / L to configure an electroplating solution with a concentration of 5mol / L and a pH value of 2.3; use three electrodes The system consists of a working electrode, an auxiliary electrode and a reference electrode to deposit ruthenium oxide on the aluminum foil. In the three-electrode system, the working el...

Embodiment 3

[0144] 1. Experimental materials: electrode sheets prepared under the conditions of products 1-4 in Example 1 and electrode sheets prepared under the conditions of products 1-4 in Example 2

[0145] 2. Experimental method

[0146] With Chroma LCR METER MODEL--100 type capacitor tester, the capacitance of the electrode sheet in the product 1-4 in the above-mentioned embodiment 1 and the product 1-4 in the embodiment 2 is measured;

[0147] The firmness of the carbon layer is assessed by a qualitative test using adhesive tape. Under the condition of 1kHz-0.3V, the aluminum / carbon composite foil is soaked in the measuring solution and placed for 20 days, then taken out and dried, and the electrode pieces in the products 1-4 in the embodiment 1 and the products 1-4 in the embodiment 2 are measured. The quality of the carbon layer depends on the shedding of the carbon layer, and then evaluates the firmness of the carbon layer, and calculates according to the following formula:

...

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Abstract

The invention discloses an electrode sheet and its preparation method and application. The electrode sheet includes aluminum foil and composite carbon slurry coated on the surface of the aluminum foil, the aluminum foil ω(Al)≥99.9%, and the thickness is 50 μm; The carbon layer quality of the composite carbon material coated on the surface of the aluminum foil is 2.5mg / cm 2 -4 mg / cm 2 , the density range is 125mg / cm 3 -250mg / cm 3 . By 1) using three kinds of carbon powder to mix and adding ruthenium oxide powder to prepare composite carbon slurry and coating it on the surface of aluminum foil to obtain an electrode sheet with high specific capacity and good firmness of the carbon layer; 2) first ruthenium chloride Plated on the surface of aluminum foil, and then use the slurry coating process of mixing three kinds of carbon powder to make electrode sheets with high specific capacity and good carbon layer firmness on the surface of aluminum foil precipitated by ruthenium chloride. The two preparation methods are easy to operate , low cost, safe and efficient, wide application range, and convenient for industrial promotion.

Description

technical field [0001] The invention belongs to the technical field of solid aluminum capacitor electrode sheet manufacturing, and in particular relates to an electrode sheet and its preparation method and application. Background technique [0002] Solid aluminum capacitors use conductive polymer materials with solid electrolytes, which are electronically conductive and have good high-frequency characteristics, which expands the application range of aluminum capacitors. However, the capacitance of the cathode lead-out foil of a solid capacitor is greatly attenuated under high-frequency conditions. Seriously restrict the performance and application of solid aluminum capacitors, so changing the cathode foil material and preparation process is an effective way. [0003] Since the conductive polymer that replaces the electrolyte cannot be immersed in the corrosion pits that corrode the aluminum foil like the electrolyte, the cathode foil of the solid polymer aluminum capacitor c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042H01G9/045H01G9/025
Inventor 卢云王莉李小龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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