Self-healing solid electrolyte film as well as preparation method and application thereof

Abstract

The invention relates to a self-healing solid electrolyte film. The self-healing solid electrolyte film is prepared from the following raw materials: a monomer, a cross-linking agent, an initiator andan electrolyte salt; the molar ratio of the cross-linking agent to the monomer is 0.1%, the molar ratio of the initiator to the monomer is 1%, and the concentration of the electrolyte salt in a mixedsolution of all the raw materials is 0.1 mol/L-0. 9 mol/L. The preparation method of the film comprises the following steps: (1), measuring a monomer, respectively adding a cross-linking agent, an initiator and an electrolyte salt, and performing stirring to fully dissolve the materials to obtain a transparent solution; and (2), putting the solution obtained in the (1) into a sheet-shaped mold, and performing irradiating under ultraviolet light to crosslink and solidify the monomer in the sheet-shaped mold, thereby obtaining a self-healing solid electrolyte film. The high-tensile and self-healing solid electrolyte film is good in preparation performance and simple in process, and has the broad application prospects in the field of flexible stretchable electronic devices.

Description

technical field [0001] The invention belongs to the technical field of solid electrolyte preparation, and in particular relates to a self-healing solid electrolyte film and its preparation method and application. Background technique [0002] In recent years, flexible and wearable electronic devices such as electronic skin, smart fabrics, and implanted medical devices have received increasing attention, so the demand for wearable flexible electronic devices has also increased, and wearable flexible electronic devices require related However, as an important part of flexible electronic devices, the preparation of flexible, stretchable, and self-healing electrolyte films still faces great challenges. At present, hydrogel electrolyte films are the most researched electrolyte films. Hydrogel electrolytes have good electrical conductivity. However, the elastic modulus of hydrogel electrolytes is small, and the water in them is volatile, which is more likely to cause related flexi...

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Problems solved by technology

[0003] Solid electrolyte films have good mechanical properties, flexibility, and good assembleability. Among them, polyethylene oxide (PEO) is widely used. However, the common problem of polymers is that they have a high degree of crystallinity, resulting in low electrical conductivity, and It does not have the stretchability required for wearable electronic devices. Therefore, reducing the crystallinity of polymers, thereby increasing the conductivity and stretchability of related solid-state electrolyte films has become a research hotspot for preparing solid-state electrolytes with excellent properties.

The general approach is to add a plasticizer to the system, or to modify the solid electrolyte by copolymerization with other polymers, but the above preparation methods have poor film-forming properties, resulting in unstable electrochemical performance.

[0004] As a wearable device, the development of flexible electronic devices requires that each unit has certain self-healing properties. The introduction of self-healing properties will improve the safety and stability of related devices. However, solid electrolytes represented by PEO have The internal polymer chain segment does not contain related groups, and cannot introduce dynamic non-covalent bond interaction, so that the self-healing function cannot be effectively obtained

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