Electrolyte for high-voltage soldering lug type aluminum electrolytic capacitor and preparation method thereof

Abstract

The invention provides an electrolyte for a high-voltage soldering lug type aluminum electrolytic capacitor and a preparation method thereof, and the electrolyte comprises solvent ethylene glycol and gamma-butyrolactone. The cleaning agent further comprises any one of solvent diethylene glycol butyl ether, propylene glycol butyl ether and ethylene glycol monomethyl ether; the invention relates to a high-temperature-resistant and corrosion-resistant coating, which comprises a solute, and further comprises solute ammonium sebacate, ammonium dodecanedioate, ammonium pentaborate, 3-heptyl-2-ene-sebacic acid or 3-octyl-2-ene-undecanedioic acid. And additives such as dibutyl phosphate and the like are also included. The conductivity of the prepared electrolyte is 2.0 + / -0.2 ms / cm, meanwhile, the loss angle can be reduced by 0.02 on the original basis, meanwhile, the ripple current resistance is effectively improved, the capacity attenuation at the temperature of minus 40 DEG C can be reduced, the internal aging breakdown rate can be effectively reduced, and the production qualification rate can be increased.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to an electrolyte for high-voltage solder chip aluminum electrolytic capacitors and a preparation method thereof. Background technique [0002] As a common device on electronic circuits, capacitors play the electrical functions of filtering, energy storage, bypassing, coupling, decoupling, and switching. The core device, among which the working voltage is mostly 400V-450V solder chip aluminum electrolytic capacitors. The conductivity of the more mature electrolyte currently used in the industry is usually 1.5±0.2ms / cm. [0003] However, the production of capacitors has the problems of high loss angle and large capacity attenuation at low temperature. The use of an electrolyte with a conductivity of 2.0±0.2ms / cm in the industry can solve the problem of large loss angle, but the capacity attenuation at -40°C is usually ≥20%, which cannot meet the requirements of some low-temperat...

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Problems solved by technology

[0003] However, the production of capacitors has the problems of high loss angle and large capacity attenuation at low temperature

However, using an electrolyte with a conductivity of 2.0±0.2ms / cm in the industry can solve the problem of a large loss angle, but the capacity attenuation at -40°C is usually ≥ 20%, which cannot meet the requirements of some low-temperature use scenarios, and When this type of electrolyte is used to make 450V solder tab capacitors, the aging breakdown rate is relatively high, basically above 1000PPM. If the on-site process control is not in place, it will reach 3000PPM or higher. higher failure rate

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