Flame-retardant organic electrolyte for supercapacitor, preparation method of flame-retardant organic electrolyte and supercapacitor

Abstract

A flame-retardant organic electrolyte for a supercapacitor comprises an electrolyte salt, a non-aqueous organic solvent and a functional additive, wherein the electrolyte salt is tetraethylammonium tetrafluoroborate and tetramethylammonium bis(oxalate)borate, the non-aqueous organic solvent is propylene carbonate, dimethyl carbonate, ethyl methyl carbonate and gamma-butyrolactone, and the functional additive is a fluoro-substituted phosphonitrile compound. With the adoption of appropriate proton inertia organic solvent, the dissolving capacity and the dissociation capacity of the electrolyte salt in the supercapacitor electrolyte are improved, the ion conductivity of the electrolyte is improved, the internal resistance of an organic electrolyte is reduced, an electrochemical stable windowof the electrolyte is expanded, so that the obtained electrolyte has favorable electrochemical stability, chemical stability and charge-discharge cycle stability; and a relatively small amount of flame-retardant agent fluoro-substituted phosphonitrile compound is added, thus, the influence on the electrical property of the electrolyte is relatively small, the influence on the viscosity of the electrolyte is relatively small, and a relatively good flame-retardant effect can be achieved.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a flame-retardant organic electrolyte for a supercapacitor, a preparation method thereof and a supercapacitor. Background technique [0002] Supercapacitor is a highly competitive energy storage product that can realize fast charging and high current discharge, and has a charging life of more than 100,000 times. It plays an extremely important role in some applications that require short-term high-rate discharge. . [0003] Supercapacitors are mainly composed of electrode materials, current collectors, diaphragms and electrolytes. As an important part of supercapacitors, electrolytes composed of solvents and electrolyte salts are extremely important research areas. Different types of electrolytes often have a significant impact on the performance of supercapacitors. Finding a suitable electrolyte is one of the focuses of current research on supercapacitors. Electrolyte ...

AI Technical Summary

Problems solved by technology

The electrolyte of organic supercapacitors mostly uses aprotic liquids with high dielectric constants as solvents. However, these solvents have low lightning. The amount of flame retardant added in the existing electrolyte to obtain a better flame retardant effect is about 20wt%. Such addition makes the electrolyte viscosity higher and seriously affects the electrical properties of the electrolyte.