A kind of capacitor composite electrolyte and its preparation method and application

Abstract

The invention provides a method for preparing a capacitor composite electrolyte. In the method, butyl acrylate and methyl methacrylate are copolymerized with dipropylene phthalate as a crosslinking agent to obtain a white copolymer, and then the white copolymer is The material, electrolyte matrix and nano-oxides are dispersed in N-N dimethylformamide solvent, heated and stirred to form a gel; the gel is coated into a film, soaked in water for phase exchange, and then dried to obtain a composite polymer Membrane: immersing the composite polymer membrane in tetraethylammonium tetrafluoroborate electrolyte and activating to obtain the capacitor composite electrolyte. The composite electrolyte obtained by the method of the invention has good mechanical properties and good electrochemical properties at the same time, and does not need an additional support to improve the mechanical properties.

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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