Cathode material used for high-energy tantalum mixed capacitor and preparation method thereof

A technology of hybrid capacitors and cathode materials, applied in capacitor electrodes, capacitor parts, capacitor electrolytes/absorbers, etc., can solve the problems of low impedance and difficult to meet requirements, and achieve the expansion of cathode specific capacitance surface area, ensure super capacity and ESR The effect of the requirement of other parameters

Active Publication Date: 2009-09-16
ZHUZHOU RIWANG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tantalum electrolytic capacitors are developing in the direction of miniaturization, large capacity, low impedance, and low ESR. Traditional cathode materials and preparation methods have been difficult to meet the requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A cathode material for a tantalum hybrid capacitor, the cathode material for a tantalum hybrid capacitor includes a cathode base material made of tantalum foil, and its special feature is that the surface of the cathode base material made of tantalum foil is coated with Amorphous oxide. An electrochemical capacitor is formed between the cathode coated with amorphous oxide and the impregnated electrolyte. The amorphous oxide coated on the tantalum foil is a composite material, and the composition of the composite material is: 73% of pyrrolidone solvent; 5% of polyvinyl fluoride polymer; 2%; RuO 2 , CuO and NiO 2 Other metal oxides are 20%.

[0014] The process of coating amorphous oxide on the tantalum foil cathode base material includes the following steps:

[0015] (1) Deoxygenation cleaning: According to the acidic solution composed of deionized water, nitric acid and hydrofluoric acid, put the cathode tantalum foil into the solution for 1h~2h, take it out, boil i...

Embodiment 2

[0020] A cathode material for a high-energy tantalum hybrid capacitor. The cathode material for a high-energy tantalum hybrid capacitor includes a cathode base material made of tantalum foil. The special feature is that the surface of the cathode base material made of tantalum foil is coated with Coated with an amorphous oxide. An electrochemical capacitor is formed between the cathode coated with amorphous oxide and the impregnated electrolyte. The amorphous oxide coated on the tantalum foil is a composite material, and the composition of the composite material is by weight percentage: pyrrolidone solution is 56%; vinyl fluoride homopolymer is 10%; ultrafine active carbon powder is 5%; RuO 2 、Al 2 o 3 and NiO 2 was 29%.

[0021] The process of coating amorphous oxide on the tantalum foil cathode base material includes the following steps:

[0022] (1) Deoxygenation cleaning: According to the acidic solution composed of deionized water, nitric acid and hydrofluoric acid,...

Embodiment 3

[0027] A cathode material for a tantalum hybrid capacitor, the cathode material for a tantalum hybrid capacitor includes a cathode base material made of tantalum foil, and its special feature is that the surface of the cathode base material made of tantalum foil is coated with Amorphous oxide. An electrochemical capacitor is formed between the cathode coated with amorphous oxide and the impregnated electrolyte. The amorphous oxide coated on the tantalum foil is a composite material, and the composition of the composite material is: 63% of pyrrolidone solvent; 7% of vinyl fluoride homopolymer; 3% of ultrafine activated carbon powder %;RuO 2 and NiO 2 was 27%.

[0028] The process of coating amorphous oxide on the tantalum foil cathode base material includes the following steps:

[0029] (1) Deoxygenation cleaning: According to the acidic solution composed of deionized water, nitric acid and hydrofluoric acid, put the cathode tantalum foil into the solution for 1h~2h, take i...

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PUM

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Abstract

The invention relates to a cathode material used for a high-energy tantalum mixed capacitor and a preparation method thereof; the cathode material comprises a cathode base material made of tantalum foil; the surface of the cathode material made of tantalum foil is coated with composite material of amorphous metal oxide and ultra-fine activated carbon powder; and an electrochemical capacitor is formed between the composite cathode material coated on the surface and injected electrolyte. The amorphous metal oxide coated on the tantalum foil is composite material; the composite material comprises the following substances: pyrrolidone substance is used as a solvent, homopolymer of vinyl fluoride is used as a bonding agent and various metal oxides and ultra-fine carbon powder form the composite material. The composite material comprises the following substances by weight percentage: 56 percent to 73 percent of pyrrolidone, 5 percent to 10 percent of polymer of vinyl fluoride, 2 percent to 5 percent of ultra-fine activated carbon powder and 20 percent to 29 percent of various metal oxides.

Description

technical field [0001] The invention relates to a capacitor material and a manufacturing method thereof, in particular to a cathode material of a high-energy hybrid capacitor composed of a tantalum electrolytic capacitor and an electrochemical capacitor and a manufacturing method thereof. Background technique [0002] At present, the known non-solid tantalum electrolytic capacitors are electroplated or chemically plated a layer of dense and porous Pt on the inner wall of the metal shell to increase the cathode area and increase the capacity. However, tantalum electrolytic capacitors are developing in the direction of miniaturization, large capacity, low impedance, and low ESR, and traditional cathode materials and preparation methods have been difficult to meet the requirements. Therefore, it is urgent to improve the performance of cathode materials. For capacitors with small volume and large energy storage, in order to meet the energy storage characteristics of the product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/022H01G9/04H01G9/22
CPCY02E60/13
Inventor 刘建清刘敏
Owner ZHUZHOU RIWANG ELECTRONICS TECH
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