Polymer solid sheet type tantalum electrolyte capacitor and its manufacturing method

Abstract

The invention discloses a polymer solid chip Ta electrolytic capacitor and a preparation method thereof; wherein, the capacitor comprises Ta capacitor grains which are arranged in an encapsulation shell; the Ta capacitor grain consists of a Ta anode with a Ta eduction wire, a medium layer and a polymer cathode layer; the Ta anode is covered by the medium layer which is covered by the polymer cathode layer, the high-frequency conductivity of which is 20S / cm; the Ta eduction wire of the Ta anode is electrically connected with the anode eduction wire of the encapsulation shell; the polymer cathode layer is electrically connected with the cathode eduction wire of the encapsulation shell; the Ta electrolytic capacitor takes a 3, 4-ethylene dioxythiophene PEDT layer as the cathode so as to leadthe cathode resistance of the Ta electrolytic capacitor to be reduced by one magnitude compared with the MnO2 cathode and to improve the working frequency by 1-2 magnitude; the Ta electrolytic capacitor has excellent high-frequency performance, effectively improves the safety, and generates no combustion or explosion as the products which take the MnO2 as the cathode when accidental breakdown occurs during the usage process.

Description

technical field [0001] The invention relates to the field of electronic components, in particular to a polymer solid chip tantalum electrolytic capacitor and a manufacturing method thereof. Background technique [0002] The high impedance of the capacitor, especially the high high-frequency impedance, will make the inductive reactance of the capacitor also high. The inductance and impedance of the capacitor will become capacitive reactance with the increase of frequency, resulting in a decrease in the capacity of the capacitor, which makes this capacitor unable to operate Higher frequencies maintain a certain capacity. This kind of capacitor cannot be used in high-frequency circuits. If it is used in a circuit with high frequency, the capacitor capacity will decrease with the increase of frequency. [0003] Tantalum electrolytic capacitors with excellent performance in various circuits have the above-mentioned shortcomings. The capacity and test or use frequency of tantalum...

AI Technical Summary

Problems solved by technology

[0002] The high impedance of the capacitor, especially the high high-frequency impedance, will make the inductive reactance of the capacitor also high. The inductance and impedance of the capacitor will become capacitive reactance with the increase of frequency, resulting in a decrease in the capacity of the capacitor, which makes this capacitor unable to operate Higher frequencies maintain a certain capacity

This kind of capacitor cannot be used in high-frequency circuits. If it is used in a high-frequency circuit, the capacitor capacity will decrease with the increase of frequency.

[0003] Tantalum electrolytic capacitors with excellent performance in various circuits have the above-mentioned shortcomings. The capacity and test or use frequency of tantalum electrolytic capacitors are as follows: figure 1 The relationship shown: that is, when the test or use frequency increases to a certain value, the capacity of the tantalum electrolytic capacitor will decrease with the increase of frequency, and when the frequency increases to the same resonant frequency as the tantalum electrolytic capacitor, the capacity of the tantalum electrolytic capacitor will decrease loss, and becomes an inductor

[0004] The reason for this phenomenon of tantalum electrolytic capacitors is that the cathode of ordinary chip tantalum electrolytic capacitors uses manganese dioxide, an electronic conductivity type semiconductor material, which makes the cathode impedance of chip tantalum electrolytic capacitors larger, which in turn makes the inductance and impedance of tantalum electrolytic capacitors It will become a capacitive reactance with the increase of frequency, resulting in a decrease in the capacity of tantalum electrolytic capacitors, and the existing technology can no longer make the high-frequency impedance of tantalum electrolytic capacitors lower through process technology, so that chip tantalum electrolytic capacitors with excellent performance are due to high frequency Impedance [ESR] is high, the frequency of use is strictly limited, and it is almost impossible to use it in circuits with operating frequencies above the MHZ level

However, due to the rapid development of microelectronics technology, the main operating frequency of ordinary processors in existing microelectronic circuits may reach MHZ or above. In digital circuits with complex logic operations, the operating frequency is higher, so the use of carbon dioxide Chip tantalum electrolytic capacitors with manganese as the cathode basically cannot be used as filter elements in such circuits

This shortcoming of tantalum electrolytic capacitors greatly limits the application range of chip tantalum electrolytic capacitors

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