Self-healing hydrogel electrolyte film, and preparation method and application thereof

Abstract

The invention relates to a self-healing hydrogel electrolyte film, and a preparation method and an application thereof. The electrolyte film is prepared by copolymerization of [2-(methylacryloyloxy)ethyl]dimethyl-(3-sulfonic acid propyl)ammonium hydroxide and a methacrylic acid monomer. Compared with the prior art, the hydrogel electrolyte film disclosed by the invention not only has very high tensile strength, but also shows excellent repeatable self-healing performance. The hydrogel film is used as an electrolyte, and a wrinkled electrode is prepared on the surface of the hydrogel electrolyte film by a pre-stretching method; a flexible supercapacitor prepared from the hydrogel film has good tensile property (1,000%) and self-healing performance, and the healed supercapacitor shows the energy storage performance consistent with that of an original device. The high-tensile and self-healing supercapacitor is relatively simple in structure and preparation process, and has a wide application prospect in the field of flexible stretchable electronic devices.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials, and in particular relates to a self-healing hydrogel electrolyte film and its preparation method and application. Background technique [0002] In recent years, flexible and wearable electronic devices such as electronic skins, smart fabrics, and implanted medical devices have received extensive attention, so the demand for wearable flexible energy storage devices has also increased. Wearable flexible energy storage devices require related devices with excellent flexibility and stable electrochemical performance under deformation conditions. As a kind of energy storage device, supercapacitor has both high energy density and power density, and has excellent cycle stability and fast charge and discharge performance. Therefore, flexible supercapacitor devices are used in portable electronic products and flexible It has broad application prospects in the field of wearable electronic ...

AI Technical Summary

Problems solved by technology

However, the mechanical properties of polyvinyl alcohol-based hydrogel electrolytes are not high, neither intrinsic self-healing properties nor high tensile properties

[0003] At present, for hydrogel electrolytes, the self-healing function mainly relies on the introduction of dynamic non-covalent bonds. Commonly used dynamic non-covalent bonds as cross-linking points include hydrogen bonds and coordination bonds. However, using such dynamic non-covalent bonds The self-healing performance of hydrogel electrolytes obtained by covalent bonds as a cross-linking method tends to be poor, and the number of break / repair cycles is usually less

Moreover, compared with the covalent cross-linking method, due to the low energy of the dynamic non-covalent bond, it is easy to be destroyed as the main energy dissipation point under stretching conditions, which cannot meet the needs of large deformation of related devices.

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