Preparation method of low-temperature solid electrolyte and application of low-temperature solid electrolyte in low-temperature solid supercapacitor

Abstract

The invention relates to a preparation method of a low-temperature solid electrolyte and application of the low-temperature solid electrolyte in a low-temperature solid supercapacitor. The preparation method comprises the steps that acetone is added into polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and fully dissolved to obtain a transparent viscous solution A; an electrolyte salt is added into a solvent and uniformly mixed to obtain an electrolyte solution B; the solution A and the solution B are uniformly mixed to obtain a precursor solution C; and the precursor solution coats a clean and smooth substrate through blade coating or curtain coating and subjected to natural drying to obtain a low-temperature solid electrolyte membrane with a size of 20-100 microns. The prepared solid electrolyte has high conductivity at a low temperature; the preparation method is simple, easy to implement and wide in applicability; and when the low-temperature solid electrolyte is applied to the preparation of the low-temperature solid supercapacitor, the working temperature of the prepared solid supercapacitor is as low as -60 DEG C, the solid supercapacitor has excellent rate capability, low internal resistance, high energy density and long cycle life at low temperature, and the application range of the low-temperature solid supercapacitor in the fields of military industry or civil use and the like is widened.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a preparation method of a low-temperature solid electrolyte and its application in a low-temperature solid supercapacitor. Background technique [0002] Supercapacitors have received extensive attention due to their high power density and excellent cycle life, wide operating temperature range, etc. At present, in ultra-low temperature environments, such as: below -55°C, supercapacitors also have special requirements: to provide energy for vehicle startup at low temperatures; they are also widely used in aerospace, extremely cold, high-altitude areas, and military industries, such as: as The power supply of electronic equipment such as sensors on spaceships; in the polar regions, the energy storage equipment that controls the pitch angle of solar generators; the energy source of laser weapons that operate in various environments, etc. For Li-ion batteries, low...

AI Technical Summary

Problems solved by technology

The poor performance of organic supercapacitors at low temperatures is due to the high freezing point of conventional organic solvents and the severe drop in the conductivity of the electrolyte at low temperatures.

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