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Sulfur/MXene/graphene composite material and preparation method and application thereof

A composite material and graphene technology, applied in the field of materials, can solve the problems of insufficient ability to adsorb elemental sulfur, easy dissolution of intermediate polysulfides, and low utilization rate of sulfur in active substances, and achieve fast interlayer ion channels , buffer volume effect to maintain, increase the effect of density

Active Publication Date: 2020-11-06
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not only complicated in process, high in energy consumption, but also requires high equipment
Another way is to use porous carbon as the base material to compound, and use the good conductivity of carbon-based materials to improve the conductivity of the positive electrode material, but the ability of this method to adsorb elemental sulfur is still not up to the requirement
[0005] Therefore, at present, there is no effective solution to the problems of low actual specific energy caused by the poor conductivity of cathode materials for lithium-sulfur batteries, the easy dissolution of intermediate polysulfides, and the low utilization rate of active material sulfur.

Method used

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  • Sulfur/MXene/graphene composite material and preparation method and application thereof
  • Sulfur/MXene/graphene composite material and preparation method and application thereof
  • Sulfur/MXene/graphene composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of MXene material: Weigh 2g of lithium fluoride (LiF) and dissolve it in 40ml of hydrochloric acid (HCl), stir constantly, and slowly add 2g of aluminum carbide titanium (Ti 3 AlC 2 ), continue to stir, and react at room temperature for 25h, and the resulting reaction product is washed with deionized water and ethanol respectively until the solution is neutral, and then it is placed in deionized water for ultrasonic dispersion treatment (temperature is 25°C, power 200W, time 5 hours), and finally freeze-drying (condensation temperature lower than -40°C, vacuum degree lower than 10Pa, time 18h) to obtain MXene material.

[0053] Preparation of sulfur / MXene / graphene composite material: Weigh 20mg of MXene material, 5mg of graphene and 75mg of elemental sulfur for mixing and grinding, then sieve the resulting mixed powder and put it into a closed container with oxygen value <0.1ppm and water content <0.1ppm In the process, the melt-diffusion reaction was carri...

Embodiment 2

[0060] Preparation of MXene material: Weigh 4g of lithium fluoride (LiF) and dissolve it in 80ml of hydrochloric acid (HCl), stir constantly, and slowly add 4g of aluminum carbide titanium (Ti 3 AlC 2 ), continue to stir, and react at room temperature for 25h, and the resulting reaction product is washed with deionized water and ethanol respectively until the solution is neutral, and then it is placed in deionized water for ultrasonic dispersion treatment (temperature is 25°C, power 200W, time 5 hours), and finally freeze-drying (condensation temperature lower than -40°C, vacuum degree lower than 10Pa, time 18h) to obtain MXene material.

[0061] Preparation of sulfur / MXene / graphene composite material: Weigh 10mg MXene material, 10mg graphene and 80mg elemental sulfur for mixing and grinding, then sieve the resulting mixed powder and put it into a closed container with oxygen value <0.1ppm and moisture <0.1ppm In the process, the melt diffusion reaction was carried out at 160...

Embodiment 3

[0064] Preparation of MXene material: Measure 40ml of hydrofluoric acid (HF), slowly add 2g of aluminum carbide titanium (Ti 3 AlC 2 ), continue to stir, react at room temperature for 25h, wash the obtained reaction product with deionized water and ethanol respectively until the solution is neutral, then place it in deionized water for ultrasonic dispersion treatment (temperature is below 25°C, power 200W, time 5 hours), and finally freeze-drying treatment (condensation temperature is lower than -40°C, vacuum degree is less than 10Pa, time 18h) to obtain MXene material.

[0065] Preparation of sulfur / MXene / graphene composite material: Weigh 25mg MXene, 15mg graphene and 60mg elemental sulfur for mixing and grinding, then sieve the resulting mixed powder and put it into a closed container with oxygen <0.1ppm and humidity <0.1 ppm , melt-diffusion reaction was carried out at 150° C., the sample was taken out after 10 h of reaction, and the sulfur / MXene / graphene composite materi...

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Abstract

The invention relates to a sulfur / MXene / graphene composite material and a preparation method and application thereof. The composite material is prepared from elemental sulfur, MXene and graphene, andthe mass ratio of the elemental sulfur to the MXene to the graphene is (4-17):(1-6):1. The preparation method of the sulfur / MXene / graphene composite material comprises the following steps: mixing andgrinding the elemental sulfur, the MXene and the graphene, and then preparing the sulfur / MXene / graphene composite material through a vacuum melting diffusion method. The sulfur / MXene / graphene composite material is high in sulfur loading capacity, good in conductivity. When the material is used as a positive electrode material of a lithium-sulfur battery, the composite material can improve the conductivity of the positive electrode material and the utilization rate of active substance sulfur, and can adsorb intermediate-state polysulfide generated in the reaction process, thereby avoiding the shuttle effect caused by the dissolution of the intermediate-state polysulfide, and further improving the specific energy and coulombic efficiency of the lithium-sulfur battery.

Description

technical field [0001] The present invention relates to the field of materials, in particular to a sulfur / MXene / graphene composite material and its preparation method and application. Background technique [0002] With the continuous improvement of people's demand for energy, the development of new energy storage systems is becoming more and more important. Compared with lithium-ion batteries with good performance, the lithium-sulfur battery with metal lithium as the negative electrode and elemental sulfur as the positive electrode has obvious advantages, and its theoretical specific energy can reach 2600Wh / kg (the theoretical specific capacities of lithium and sulfur are 3860mAh / kg, respectively. g and 1675mAh / g). In addition, lithium-sulfur batteries also have the advantages of abundant raw material reserves, low cost, and environmental friendliness, so they have attracted the attention of researchers and are considered to be one of the most potential research directions ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/052
CPCH01M4/38H01M4/625H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 黄国家李悦尹香槟杨波李茂东文芳黎佩珊
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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