Ternary mixed solvent with high boiling point and low freezing point and application thereof

Abstract

The invention provides a ternary mixed electrolyte solvent with a high boiling point and a low freezing point. The ternary mixed electrolyte solvent comprises the following raw materials in part by weight: 70 to 80 parts of esters solvent, 5 to 10 parts of ether solvent and 5 to 10 parts of ketones solvent, and is preferably a ternary mixture of gamma-butrolactone, cyclohexanone-based cyclohexeneand diethylene glycol monobutyl ether. The ternary mixed electrolyte solvent provided by the invention can be applied to chip aluminum electrolytic capacitor electrolyte. The ternary mixed electrolyte solvent can be applied to the preparation of the electrolyte with monotetramethyl-ammonium phthalate; and the aluminum electrolytic capacitor prepared from the ternary mixed electrolyte solvent is stable in performance and apparently normal after being loaded for 2,000 hours at the high temperature of 105 DEG C, and has the expansion ratio of 0 after reflow soldering.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a mixed solvent with a high boiling point and a low freezing point and its application in the electrolytic solution of a capacitor. Background technique [0002] Compared with other capacitors, aluminum electrolytic capacitors have the advantages of large capacity, low production cost, and high reliability, and are widely used in various electrical appliances such as TVs. Chip aluminum electrolytic capacitors are another new type of high-performance capacitors following ordinary aluminum electrolytic capacitors, and belong to high-end products in electrolytic capacitors. However, there are also some defects in its application process: some factors will cause its electrolytic capacitor to fail, such as extremely low temperature, capacitor temperature rise (soldering temperature, ambient temperature, AC ripple), excessive voltage, instantaneous voltage, and even High freq...

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Problems solved by technology

However, there are also some defects in its application process: some factors will cause its electrolytic capacitor to fail, such as extremely low temperature, capacitor temperature rise (soldering temperature, ambient temperature, AC ripple), excessive voltage, instantaneous voltage, and even High frequency or reverse bias; temperature rise is the factor that most affects the working life of electrolytic capacitors

[0008] γ-butyrolactone is a solvent with high boiling point, strong solubility, good electrical properties and stability. It is usually used as a solvent, but its high temperature resistance is not ideal, and it is difficult to meet the surface assembly of chip aluminum electrolytic capacitors. High temperature test at 250°C

In addition, there are many solvents with a higher boiling point than γ-butyrolactone, but the disadvantage of using these solvents alone is that the low-temperature performance of the capacitor is poor

The boiling point of cyclohexanone cyclohexene and diethylene glycol monobutyl ether is higher than that of γ-butyrolactone, and the freezing point is also lower, but the conductivity of the electrolyte prepared by using the two to the electrolyte is low, and the solubility Not high enough to be used alone

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