Capacitor composite electrolyte and preparation method thereof, and application of capacitor composite electrolyte

Abstract

The invention provides a preparation method of a capacitor composite electrolyte. The method comprises the steps of: taking butyl acrylate, methyl methacrylate and diallyl phthalate as cross-linking agents for copolymerization to obtain a white copolymer, dispersing the white copolymer, an electrolyte matrix and a nano oxide in an N-N dimethylformamide solvent for heating stirring to form gel, coating the gel to form a film, socking the film in water for phase exchange, and drying the film to obtain a composite polymer film; and soaking the composite polymer film into a tetraethylammonium-tetrafluoroborate electrolyte for activation to obtain the capacitor composite electrolyte. The composite electrolyte obtained by the method has good mechanical property and electrochemical property, anddoes not need an additional support body to improve the mechanical property.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a capacitor composite electrolyte and its preparation method and application. Background technique [0002] Compared with other energy storage devices, supercapacitors can provide powerful pulse power and fast charge and discharge speeds because their energy storage mechanism is simple charge transfer at the electrochemical interface between electrodes and electrolyte. Since the discharge current is only limited by internal resistance and heat generation, the energy conversion efficiency is high, with high mass energy density and volume energy density; long cycle life, high capacity retention rate; wide operating temperature range. Since the 1950s, supercapacitors have become a research hotspot in the field of chemical power sources. After decades of development, supercapacitors have played a very important role in electric vehicles, electronic products, new energy p...

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Problems solved by technology

[0003] However, at present, the composite electrolyte has poor mechanical properties such as brittleness and tensile properties, and it is easy to cause the composite electrolyte to break during the assembly process, causing a short circuit and reducing the yield.

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