A kind of low-impedance flame-retardant supercapacitor electrolyte and preparation method thereof

Abstract

The present invention discloses a low-impedance flame-retardation supercapacitor electrolyte. The electrolyte comprises the following components of: electrolyte salt, an organic solvent, a flame retardation additive, a impedance reduction additive and a function additive. The preparation method comprises the following steps of: (1) dissolving the flame retardation additive after de-watering into the organic solvent to obtain mixed liquor, adding the function additive into the mixed liquor, and obtaining a solution A; and (2) adding quaternary ammonium salt and lithium salt into the solution Ain the step (1) in an anhydrous and anaerobic environment, preparing an electrolyte, and namely obtaining a low-impedance flame-retardation supercapacitor electrolyte. The electrolyte prepared by theinvention is low in toxicity, low in viscosity and wide in electrochemistry window and temperature range, has an efficient flame retardation effect and can greatly improve the safety performance of alithium battery.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a low-impedance flame-retardant supercapacitor electrolyte and a preparation method thereof. Background technique [0002] In the decades since the advent of supercapacitors, they have been rapidly developed and widely used. Because supercapacitors have the advantages of long cycle charge and discharge life, fast charge and discharge speed, large capacity, wide operating temperature range, high power density, and environmental protection, they have broad application prospects. [0003] However, the safety of supercapacitors has always been our primary concern. Since the electrolyte used in supercapacitors is a flammable organic electrolyte system, when the battery is overcharged, short-circuited or heated, the battery may catch fire, burn or explode, causing safety accidents. [0004] Although the flame retardant additives in the prior art can reduce the flammability of the el...

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Problems solved by technology

[0004] Although the flame retardant additives in the prior art can reduce the flammability of the electrolyte to a certain extent, most of the flame retardant additives have a relatively large negative impact on the performance of the supercapacitor battery. There are still many hidden dangers in safety, which are easy to cause safety accidents. Therefore, it is urgent to develop a low-impedance flame-retardant supercapacitor electrolyte and its preparation method

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