Organic functionalized graphene material and preparation method and application thereof

Abstract

The invention discloses an organic functionalized graphene material and a preparation method and application thereof. The preparation method comprises the steps of: dispersing graphene oxide in deionized water for sufficient stirring; ultrasonically dispersing the graphene oxide for uniform dispersion; and adding tetrahydroxyquinone for continuous stirring and drying so as to obtain a tetrahydroxyquinone functionalized graphene material. The preparation method is simple and easy in process; the tetrahydroxyquinone functionalized graphene material is capable of solving the problems that the organic materials have poor conductivity and are easily soluble in lithium ion battery organic electrolyte and the graphene material has a relatively low capacity; and being used as a lithium ion batterycathode material, the graphene material exhibits excellent rate performance and cycle stability, and has wide application values.

Description

technical field [0001] The invention relates to the field of organic functionalized graphene materials, in particular to a tetrahydroxybenzoquinone functionalized graphene material and its preparation method and application in lithium ion batteries. Background technique [0002] With the rapid development of science and technology in modern society, people have a greater demand for the energy density of lithium-ion batteries. Traditional lithium-ion batteries use graphite materials as negative electrodes, but the theoretical capacity of graphite materials is low (372mAh / g), which cannot meet people's needs. In order to improve the capacity and rate performance of lithium-ion batteries, some new negative electrode materials have been applied to lithium-ion batteries, including silicon-based materials and transition metal oxide materials. However, their low Coulombic efficiency, poor cycle stability and limited mineral resources limit their application in Li-ion batteries. I...

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Problems solved by technology

[0003] The purpose of the present invention is to address the above-mentioned defects of existing materials, in order to solve the problems of poor electrical conductivity of organic materials, easily soluble in lithium-ion battery organic electrolytes and low capacity of graphene materials, an organic functionalized graphene is provided The preparation method of the material, the preparation method grafts tetrahydroxybenzoquinone on graphene oxide through esterification, uses graphene as a channel for conducting lithium ions and electrons, and at the same time, avoids tetrahydroxybenzoquinone in organic electrolysis The dissolution in the liquid also greatly improves the electrochemical performance of the material

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