Sulfonated graphene metal salt solid polymer electrolyte and preparation method and application thereof

Abstract

The invention discloses a sulfonated graphene metal salt solid polymer electrolyte and a preparation method and an application thereof. The sulfonated graphene metal salt solid polymer electrolyte includes a sulfonated graphene metal salt and a solid polymer electrolyte, wherein the sulfonated graphene metal salt is prepared by carrying out a reaction of a part of sulfonic acid in sulfonated graphene with a metal compound; the solid polymer electrolyte is selected from polyhydroxyl polymer; the sulfonated graphene metal salt and the solid polymer electrolyte are combined by carrying out a reaction of a part of sulfonic acid in sulfonated graphene with a part of hydroxyl in the solid polymer electrolyte. The sulfonated graphene metal salt solid polymer electrolyte has the advantages of relatively high ionic conductivity, relatively wide electrochemical window and good chemical and electrochemical compatibility with an electrode material, and has wide application prospects in lithium ion batteries, super capacitors and other electrochemical / physical energy storage devices; and the preparation technology is simple, easy to implement, regulate and control, mild in reaction conditions, wide in raw material sources, and convenient for large-scale production.

Description

technical field [0001] The present invention relates to a solid electrolyte, especially a sulfonated graphene metal salt solid polymer electrolyte, its preparation method and application, for example, the application in electrochemical and / or physical energy storage devices such as capacitors and batteries. Background technique [0002] Electrolytes have long been used as transportable ion providers or ion transport channels in secondary batteries, capacitors, sensors, and dye-sensitized solar cells. The traditional electrolyte is mainly a liquid electrolyte system. Although it has the advantages of high ionic conductivity, it also has disadvantages such as easy leakage, flammability and explosion. To this end, people have developed a variety of new electrolytes, one of which is an all-solid electrolyte with great application prospects. Especially in recent years, polymer-based solid electrolytes have developed rapidly, and the existing solid electrolytes are composed of po...

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Problems solved by technology

However, inorganic nanofillers are prone to agglomeration and uneven dispersion in the polymer matrix, which limits the further improvement of the electrical properties of composite polymer electrolytes.

[0004] For example, some studies have used graphene, graphene oxide, etc. as fillers for solid polymer electrolytes, in order to use the high ionic conductivity (about 2.1S / cm) of graphene materials to improve the ionic conductivity of the polymer matrix. However, it also cannot overcome the problems of graphene material agglomeration in the polymer matrix.

Although the proposals such as CN103881278A, CN102585280A, CN103560268A, CN102891335A and other documents, by carrying out surface modification to graphene materials to improve the scheme of its agglomeration phenomenon, these technologies generally have defects such as complicated process and high cost, and in fact the obtained There is still a certain problem of graphene agglomeration in the product, which makes its performance, especially the ionic conductivity and electrochemical window width, still very limited, and the chemical and electrochemical compatibility with common electrode materials still needs to be improved.

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