Difunctional self-healing polymer electrolyte and preparation method thereof

Abstract

The invention discloses a difunctional self-healing polymer electrolyte. The difunctional self-healing polymer electrolyte comprises polyethylene glycol with double bonds, a cross-linking agent with adisulfide bond, an initiator and a chain transfer reagent, wherein the cross-linking agent with the disulfide bond has the disulfide bond and the hydrogen bond at the same time. The invention also provides a preparation method of the difunctional self-healing polymer electrolyte. The method comprises the following steps: S1, reacting a monomer with double bonds with a monomer with disulfide bondsin a first solution to obtain the cross-linking agent with the disulfide bond; S2, dissolving the cross-linking agent with the disulfide bond and polyethylene glycol with the double bonds in a secondsolvent, adding an initiator and a chain transfer reagent, performing deoxidizing, and heating for reaction to obtain a PEG-SS copolymer; and S3, dissolving the PEG-SS copolymer in a third solvent, adding a lithium salt for uniformly stirring, pouring the mixed solution into a film, and drying the film to obtain the difunctional self-healing polymer electrolyte. The cross-linking agent with the disulfide bond has the disulfide bond and the hydrogen bond at the same time, and self-healing of the electrolyte material at the room temperature is achieved.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolytes, and more specifically relates to a bifunctional self-healing polymer electrolyte and a preparation method thereof. Background technique [0002] Since the first commercial release of lithium-ion batteries at the end of the 20th century, it has developed rapidly over the past two decades. With its own high energy density, low discharge rate and other advantages, it is widely used in daily electronic equipment such as computers and mobile phones. However, traditional lithium-ion batteries will cause damage and damage to electrodes and electrolytes when they are collided or bent by external forces, which will seriously affect the electrochemical performance of the battery itself, and even cause great safety hazards. Therefore, replacing liquid electrolyte with solid electrolyte and introducing self-healing function can effectively solve a series of safety hazards brought by liquid elec...

AI Technical Summary

Problems solved by technology

However, the function of the hydrogen bond system at room temperature is difficult to meet expectations, because the binding force at room temperature is weak, and the effect of hydrogen bonds will be destroyed at high temperatures, which will make the mechanical properties and self- The ability to heal is severely affected, resulting in significantly lower performance of Li-ion batteries

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