Solid electrolytic capacitor
A technology of solid electrolyte and solid electrolyte layer, which is applied in the manufacture of solid electrolytic capacitors, electrolytic capacitors, electrolytic capacitors, etc., can solve problems such as low conductivity, and achieve the effect of heat-resistant ESR characteristics and low ESR characteristics
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no. 1 approach 〉
[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 is a sectional view of the solid electrolytic capacitor according to the first embodiment. like figure 1 As shown, the solid electrolytic capacitor 1 of this embodiment includes an anode body 11 , a dielectric layer 12 provided on the surface of the anode body 11 , a solid electrolyte layer 13 formed on the surface of the dielectric layer 12 , and a cathode body 16 . Cathode body 16 includes graphite layer 14 and silver layer 15, and this cathode body 16 serves as a cathode drawing layer that connects solid electrolyte layer 13 and a cathode (not shown).
[0016] The anode body 11 is formed of a valve metal. The valve metal may be, for example, aluminum, tantalum, niobium, titanium, zirconium, hafnium, tungsten and alloys containing these metals. These valve metal materials are only examples, and any material that can produce a rectifying effect between the di...
no. 2 approach 〉
[0038] Hereinafter, a second embodiment of the present invention will be described. figure 2 is a cross-sectional view of a solid electrolytic capacitor according to a second embodiment. The solid electrolytic capacitor 2 of this embodiment differs from the solid electrolytic capacitor 1 described in the first embodiment in that a diffusion suppressing layer 21 is formed between the dielectric layer 12 and the solid electrolytic layer 13 . Since other components of the solid electrolytic capacitor 2 of the second embodiment are similar / identical to those of the solid electrolytic capacitor 1 of the first embodiment, these similar / identical components are denoted by the same reference numerals and will not be repeated. describe.
[0039] like figure 2 As shown, solid electrolytic capacitor 2 of this embodiment includes diffusion suppressing layer 21 formed between dielectric layer 12 and solid electrolytic layer 13 . Diffusion suppression layer 21 has a function of suppres...
Embodiment 1
[0048] A tantalum plate (valve metal) is used for the anode body of the solid electrolytic capacitor. Then, the tantalum plate was electrolytically oxidized in an aqueous phosphoric acid solution under application of a voltage of 100 V to form a dielectric layer (oxide film layer) having a thickness of about 170 nm on the entire surface of the tantalum plate. Afterwards, a conductive zinc oxide film with a thickness of about 1 μm is formed on the surface of the dielectric layer by sputtering as the solid electrolyte layer. The formation area of the solid electrolyte layer is 70 cm 2 . Then, a graphite layer (about 1 μm) and a silver paste layer (about 10 μm) were formed on the solid electrolyte layer, thereby obtaining the solid electrolyte capacitor of Example 1.
[0049] The capacity of the fabricated solid electrolytic capacitors was measured using an LCR tester. The capacity value at 120 Hz and the capacity value at 100 Hz were evaluated. In addition, a pressure test...
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Abstract
Description
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