Preparation method and electrochemical performance test method of anode material graphene

Abstract

The invention discloses a preparation method and an electrochemical performance test method of an anode material graphene. The preparation method comprises the following steps: weighing a graphite powder and sodium nitrate; measuring out concentrated sulfuric acid, mixing the concentrated sulfuric acid in a three-mouth flask and reacting under the condition of a water bath; then weighing potassium permanganate, adding into the three-mouth flask and starting to adjust the temperature; adding the potassium permanganate into the three-mouth flask by two times and controlling the temperature; adding ice water and cooling a mixed solution to a room temperature; then dropwise adding 30 percent of hydrogen peroxide solution for washing; carrying out centrifugal precipitation, taking out lower-layer solid precipitation and repeatedly washing to obtain a solid product, carrying out vacuum drying, taking out the dried product, and grinding the product for later use. Graphene oxide disclosed by the invention is used as an anode material of a lithium battery, and discharged specific capacity of the graphene oxide at the temperature of 0.1DEG C is 403.4mAh / g. Furthermore, the graphene prepared by using a hydrothermal-solvent thermal reduction method is more stable in performance, the discharged specific capacity of the graphene at the temperature of 0.1DEG C is 782.8 mAh / g, and the capacity retention ratio is higher.

Description

technical field [0001] The invention belongs to the technical field of negative electrode material preparation, and in particular relates to a preparation method of negative electrode material graphene and a method for testing its electrochemical performance. Background technique [0002] With the development of science and technology, the 21st century has already entered the era of information, and intelligent equipment is gradually reaching thousands of households. For example, it is common for smart phones to be updated. As their functions become more powerful, their energy consumption also increases accordingly. The problem of mobile phone battery life has always plagued the majority of users. Therefore, the capacity performance of the battery has become a difficulty that must be overcome in the development of smart phones. In addition, today's human society regards fossil fuels as the main part of the energy system, and this kind of fossil fuels also brings some disadv...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing negative electrode material graphene and its electrochemical performance testing method, aiming to solve the problem of structural defects in graphene oxide and graphene prepared by the existing method for preparing graphene oxide, and the charging and discharging efficiency. Poor, unstable molecular structure, poor dispersion effect, etc.

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