A diaphragm for flexible solid supercapacitor and preparation method thereof

Abstract

The invention relates to a membrane for a flexible solid super capacitor and a preparation method thereof. The membrane comprises a fiber support body and a polymer electrolyte, wherein the polymer electrolyte comprises a polymer matrix, an electrolyte and an additive. The preparation method is characterized by comprising the following steps: evenly mixing the polymer matrix, the electrolyte with the additive according to mass ratio to prepare polymer electrolyte slurry; coating the polymer electrolyte slurry onto a fiber sheet by utilizing a blade coating method, and drying to obtain the membrane for the flexible solid super capacitor, wherein the thickness of the membrane is 30-120mum. As the support body, the fiber sheet forms a structure and function integrated membrane with the attached polymer electrolyte, thus, the weight of an energy storage unit is reduced; the strength of the flexible solid super capacitor can be improved; the membrane for the flexible solid super capacitor is beneficial to the integrated design of automobile interior trim parts; current-carrying ions are provided by the polymer electrolyte; the energy storage function of the device is met; new energy automobile assembly space are saved; and the membrane for the flexible solid super capacitor is safe and environmentally friendly.

Description

technical field [0001] The invention relates to a diaphragm for a flexible solid supercapacitor and a preparation method thereof, belonging to the technical field of supercapacitors. Background technique [0002] Supercapacitors have the advantages of high power density, large charge-discharge rate, long cycle life, good temperature resistance, and environmental friendliness. They are combined with fuel cells, lithium-ion batteries, and nickel-metal hydride batteries to form a composite power supply to meet the needs of automobiles for starting, accelerating, and climbing. While meeting the requirements of slope and energy recovery, the service life of the battery is extended. At present, most supercapacitors used in industrial applications use liquid electrolyte, which has safety problems caused by leakage of electrolyte, while solid supercapacitors using solid electrolyte diaphragms have higher safety. Polymers have become the first choice for solid-state electrolyte sepa...

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Problems solved by technology

The Chinese patent with the publication number CN 101354964 A reports a polymer composite film for capacitors. The rare earth catalytic material in the film has a catalytic effect on hydrogen and oxygen, which reduces the problems caused by the gas; the publication number is CN 1553462A The Chinese patent reported a diaphragm prepared by a wet papermaking method, and the strength of the film was improved by adding reinforcing fibers; in addition to improving and optimizing the efficiency of traditional engines, the low-carbon approach of automobiles also vigorously develops energy-saving and energy-saving technologies based on energy storage units. For new energy vehicles, the batteries currently used are not only heavy but also bulky, which brings many problems to the lightweight and assembly design of the vehicle