Positive pole mixed powder for producing positive pole of solid electrolytic capacitor

Abstract

The invention discloses positive pole mixed powder for producing a positive pole of a solid electrolytic capacitor. The positive pole mixed powder for producing the positive pole of the solid electrolytic capacitor comprises positive pole powder, dimethyl sulfone and solvent; the weight of the dimethyl sulfone is 1 to 20 % of the positive pole powder; the weight of the dimethyl sulfone is 0.5 to 30 % of the solvent. The positive pole mixed powder for producing the positive pole of the solid electrolytic capacitor has the advantages of enabling mobility of tantalum powder to be high, being less in residual of elements such as carbon and oxygen after dewaxing, enabling volume extraction rate to be improved by 5 to 8%, accordingly reducing the processing difficulty of a subsequent process (negative pole production) and enabling the leakage current attenuation speed of products to be improved.

Description

technical field [0001] The invention relates to the manufacture of an anode of a solid electrolytic capacitor, in particular to an anode mixed powder for preparing the anode of a solid electrolytic capacitor. Background technique [0002] At present, the miniaturization trend of solid electrolytic capacitors is intensifying. Taking tantalum capacitors as an example, the application of ultra-high specific volume tantalum powder has become the main development direction. With the increase of specific volume of tantalum powder, the particle size of tantalum powder is getting smaller and smaller. At present , When tantalum powder is mixed, the binders used are paraffin, stearic acid, camphor, glycerin, benzoic acid, etc., but when these binders are applied to high specific volume tantalum powder products, the tantalum powder after reconciliation is easy to local ball Agglomeration, after the anode block is formed, some "dead holes" are prone to appear inside the core block. When...

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Problems solved by technology

[0002] At present, the miniaturization trend of solid electrolytic capacitors is intensifying. Taking tantalum capacitors as an example, the application of ultra-high specific volume tantalum powder has become the main development direction. With the increase of specific volume of tantalum powder, the particle size of tantalum powder is getting smaller and smaller. At present , When tantalum powder is mixed, the binders used are paraffin, stearic acid, camphor, glycerin, benzoic acid, etc., but when these binders are applied to high specific volume tantalum powder products, the tantalum powder after reconciliation is prone to local balls Agglomeration, after the anode block is formed, some "dead holes" are prone to appear inside the core block. When the cathode layer is covered with manganese dioxide, the interior is not easy to penetrate, which affects the capacity extraction rate of the product and leads to quality problems such as excessive capacitance change rate.

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