Solid electrolysis capacitor and method for manufacturing the same
A technology of solid electrolysis and manufacturing methods, applied in the direction of solid electrolytic capacitors, electrolytic capacitor manufacturing, electrolytic capacitors, etc., can solve problems such as high contact resistance and insufficient ESR reduction
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no. 1 approach
[0028] (Structure of solid electrolytic capacitor)
[0029] Hereinafter, the structure of the solid electrolytic capacitor of the first embodiment will be described with reference to the drawings. figure 1 It is a figure showing the structure of the solid electrolytic capacitor 10 of 1st Embodiment.
[0030] Such as figure 1 As shown, the solid electrolytic capacitor 10 includes: an anode body 11 composed of an anode substrate 11A and a lead wire 11B, a dielectric layer 12, a first cathode layer 13A, a second cathode layer 13B, a carbon layer 14, a silver layer 15, a conductive adhesive agent layer 16, anode terminal 17, cathode terminal 18, and molding resin 19.
[0031] The anode base 11A is a porous sintered body made of a valve metal such as aluminum, tantalum, niobium, or titanium. The lead 11B is made of tantalum metal or the like. For example, the anode body 11 is formed by sintering tantalum metal powder in a state where the lead wire 11B is embedded in the tantalu...
no. 1 example
[0075] Hereinafter, the comparison results between the solid electrolytic capacitors of the examples and the solid electrolytic capacitors of the comparative examples will be described. Here, it should be noted that the structure of the cathode layer provided on the dielectric layer is different between the example and the comparative example.
[0076] (Solid electrolytic capacitor of the embodiment)
[0077] In the solid electrolytic capacitor of Example 1, the cathode layer includes: a first cathode layer (first cathode layer 13A) in which PEDOT and PPy are mixed; and a second cathode layer (second cathode layer 13B) composed of PPy.
[0078] Specifically, the first cathode layer of Example 1 was formed as follows. The capacitor element on which the dielectric layer was formed was immersed for 5 minutes in an aqueous oxidant solution containing iron p-toluenesulfonate (weight% of iron p-toluenesulfonate = 20 wt%). Next, after reacting the vapor of EDOT monomer on the surfa...
Embodiment 2～ Embodiment 12
[0106] For Examples 2 to 12, the PEDOT coverage, ESR, and capacitance were measured by the same method as in the first example.
[0107] Table 2 is a table showing these measurement results. As shown in table 2, in embodiment 2~embodiment 12, PEDOT coverage rate is 1%, 2%, 3%, 5%, 10%, 20%, 30%, 35%, 40%, 70%, 80%.
[0108] 【Table 2】
[0109] sample
[0110] As shown in Table 2, it can be confirmed that the coverage of PEDOT covering the dielectric layer is preferably greater than 0% and less than 80% at the boundary surface between the first cathode layer and the dielectric layer. In addition, it was confirmed that the coverage of the PEDOT-covered dielectric layer is more preferably greater than 2% and less than 35%.
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Abstract
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