Electric double-layer capacitor and production method therefor

Abstract

The electrical double layer capacitor includes a case, an electrolyte stored in the case, a positive electrode, a negative electrode, and a molecular sieve, wherein the electrolyte contains cation and anion, and the molecular sieve suppresses either one or both of the adsorption of cation onto a surface of the positive electrode and the adsorption of anion onto a surface of the negative electrode. Due to this configuration, it is possible to provide an electrical double layer capacitor having high withstand voltage and long life.

Description

technical field [0001] The present invention relates to an electric double layer capacitor and a manufacturing method thereof. Background technique [0002] Electric double layer capacitors require a high withstand voltage. The withstand voltage of an electric double layer capacitor depends on the electrolyte. Usually, in order to obtain an electrolyte solution with a higher withstand voltage, repeated experiments are carried out. For example, synthesize an electrolyte solution after combining various solutes and solvents envisioned, and measure the withstand voltage of the synthesized electrolyte solution. When it is judged that the measurement result of the withstand voltage satisfies the expected withstand voltage, it is used as an electrolytic solution for an electric double layer capacitor. As a result, the withstand voltage of the capacitor is improved. [0003] In addition, in order to make effective use of the improvement in withstand voltage of the electrolytic ...

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Problems solved by technology

[0005] However, the electrolyte has an inherent withstand voltage

Furthermore, electric double layer capacitors cannot be used at a voltage higher than the inherent withstand voltage of the electrolyte solution used

The reason for this is that the electrical deterioration due to the so-called reduction in capacitance or increase in internal resistance is accelerated, and the case becomes easily damaged due to an increase in the amount of gas generation accompanying the reaction of the electrolyte

In addition, it is considered that the inherent withstand voltage of the electrolyte can be used to the maximum by adjusting the electric quantity of the positive electrode and the negative electrode, but even so, it cannot be used at a voltage higher than the inherent withstand voltage of the electrolyte.

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