a cote 2 /mxene composite material and preparation method thereof

Abstract

The invention discloses a CoTe 2 The preparation method of the / MXene composite material comprises the following steps: adding the MXene material to the dispersant to prepare a dispersion liquid with a concentration of 1-10mg / ml; adding the cobalt source and the reducing agent to the above dispersion liquid, stirring and dissolving, and obtaining a mixed liquid; the above mixed solution is heated, cooled, centrifuged, washed and dried to obtain the precursor Co(OH) 2 / MXene; the above precursor Co(OH) 2 / MXene and tellurium source are heated according to the molar ratio of 1:1~6, cooled to obtain the crude product; the above crude product is centrifuged at 5000-8000r / min for 5-10min, washed and dried to obtain CoTe 2 / MXene composites. CoTe prepared by the present invention 2 The / MXene composite material is applied to the negative electrode of potassium ion batteries. It has good cycle stability, high specific capacity and excellent rate performance, and has the advantages of low cost, abundant resources, and simple preparation methods. It is suitable for large-scale production of potassium ion batteries. with application.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a CoTe 2 / MXene composite material and its preparation method. Background technique [0002] Since the 21st century, with the increasing demand for energy in modern society, fossil energy has been continuously consumed and depleted, and environmental problems have become increasingly serious, seriously affecting the sustainable development of human society. Therefore, the research and development of new renewable clean energy has been become the focus of current research. [0003] At present, as a secondary battery energy storage system, lithium-ion batteries have achieved great success in the fields of electric vehicles and portable electronic devices. The uneven distribution has led to rising prices of lithium-ion batteries, which limits their application in the field of energy storage. Therefore, developing a new type of secondary alkali metal battery has ext...

AI Technical Summary

Problems solved by technology

However, transition metal compounds tend to exhibit huge volume expansion during the charge-discharge cycle, causing the electrode material to be pulverized, resulting in poor rate performance and fast capacity fading during the cycle process.

Therefore, how to solve the problems of poor rate performance and fast capacity fading during the cycling process of transition metal compounds has become a major technical obstacle in this field.

[0006] As a new type of transition metal carbon or nitride, MXene has the advantages of excellent electrical conductivity and mechanical properties, high hydrophilic surface and ion transport performance due to its unique layered structure and rich and adjustable components. It is hoped to overcome the problems of poor rate performance and fast capacity fading during the cycle of transition metal compounds, but the interlayer distance is small, and the surface functional groups have certain adsorption properties, so it cannot achieve the ideal fast ion migration effect when used alone.

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