Preparation method of a low-temperature solid electrolyte and its application in low-temperature solid supercapacitors

Abstract

A preparation method of a low-temperature solid-state electrolyte and its application in a low-temperature solid-state supercapacitor, adding acetone to polyvinylidene fluoride-hexafluoropropylene PVDF-HFP, fully dissolving to obtain a transparent viscous solution A, adding electrolyte to the solvent Salt, mix evenly to get electrolyte solution B, mix solutions A and B evenly to get precursor solution C, scrape or cast the precursor solution on a clean and smooth substrate, and get 20-100um low-temperature solid state after natural drying Electrolyte membrane, the solid electrolyte prepared by the present invention has high electrical conductivity at low temperature, and the preparation method is simple and easy, and has wide applicability; the low temperature solid electrolyte is applied to the preparation of low temperature solid supercapacitor, and the prepared solid supercapacitor has a low working temperature To -60°C, it has excellent rate performance, low internal resistance, high energy density and long cycle life at low temperature, which broadens the application of low-temperature solid-state supercapacitors in military or civilian fields.

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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