Preparation and application method of composite single-ion solid electrolyte

Abstract

The invention relates to a preparation technology of lithium ion battery electrolytes, and aims to provide a preparation and application method of a composite single-ion solid electrolyte. The methodcomprises the steps of: taking p-styryl fluoro alkyl sulfimide lithium, acrylate polyether, nitrile imidazole type ionic liquid and a silane coupling agent KH-570, and performing free radical polymerization under the stirring condition and the initiation of ultraviolet light to prepare a copolymer; uniformly dispersing the copolymer and an inorganic nano material in a solvent to prepare a castingsolution; pouring the casting solution on a clean membrane-making glass mould uniformly, and transferring the membrane-making glass mould to a vacuum drying oven; and performing heating to completelyvolatilize the solvent, dehydrating, condensing and crosslinking the polymer to obtain a membranous composite single-ion solid electrolyte. The composite single-ion solid electrolyte obtained by the invention has the higher ionic conductivity and lithium ion transference number and good thermal stability and electrochemical stability, and has the excellent long-cycle performance and high-voltage resistance when used in a lithium ion battery; and moreover, the preparation method is simple and mild in condition and is capable of achieving large-scale production.

Description

technical field [0001] The invention relates to a preparation and application method of a composite single-ion solid state electrolyte, which belongs to the preparation technology of a novel lithium-ion battery electrolyte. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and output voltage, no memory effect, and environmental friendliness, and have been widely used in electronics, aerospace, electric vehicles and other fields. Electrolyte is one of the four key materials required for the manufacture of lithium batteries, and its performance largely determines the power density, cycle stability, safety performance, high and low temperature performance, and service life of the battery. The current commercial liquid electrolytes contain organic solvents with low boiling points, which are easy to cause safety accidents such as combustion, explosion, and liquid leakage. [0003] Compared with traditional liquid electrolytes, polymer...

AI Technical Summary

Problems solved by technology

However, because the single-ion polymer electrolyte greatly reduces the mobility of anions, the ion conductivity is very low, and the ion conductivity at room temperature is generally around 10. -6 About S / cm, far lower than ordinary polymer electrolytes, so researchers have done a lot of work to improve the room temperature ionic conductivity of single-ion polymer electrolytes

[0005] However, in the current methods of improving the ionic conductivity of single-ion polymer electrolytes, most of them use the method of adding plasticizers to prepare gel electrolytes, resulting in many problems in the obtained single-ion electrolytes.

For example, the mechanical properties and safety of the electrolyte are poor

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