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A kind of sulfur/vanadium disulfide/mxene composite material and its preparation method and application

A technology of vanadium disulfide and composite materials, applied in the direction of sulfur compounds, chemical instruments and methods, vanadium compounds, etc., can solve the problems of cumbersome steps, short service life of lithium-sulfur batteries, unsatisfactory firmness, etc., and achieve the effect of uniform particle size

Active Publication Date: 2021-11-26
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the commercialization of lithium-sulfur batteries still encounters some technical obstacles, such as the low utilization rate of positive electrode active material sulfur due to the inability to effectively fix the sulfur element, in addition, the shuttle effect caused by the dissolution of polysulfides and the volume of lithium-sulfur batteries The change will lead to a decrease in the utilization rate of the sulfur element, which will deteriorate the cycle stability of the lithium-sulfur battery, greatly reduce the service life, and even cause a series of safety problems.
[0004] For the fixation of elemental sulfur in lithium-sulfur batteries, the current sulfur-loading methods are generally not high in capacity or the steps are cumbersome. For example, carbon-coated sulfur nanosheets were synthesized by using continuous carbon coating and solution phase oxidation reaction method; For nanosheets, zinc sulfide hybrid nanosheets need to be calcined in a high-temperature inert environment. This method has certain requirements for equipment, and the steps are cumbersome and not suitable for large-scale production.
In addition, there is also a method to mix sublimated sulfur with mesoporous silica, and after secondary calcination, the sulfur element is embedded in the pore diameter by capillary force to obtain a silica-sulfur composite. This method completes sulfur fixation through capillary force, and its firmness is still passable
[0005] Therefore, in the existing lithium-sulfur battery cathode materials, due to the poor immobilization of sulfur element, the shuttle effect caused by the dissolution of polysulfides, and the change in the volume of lithium-sulfur batteries, the lithium-sulfur battery has short service life, poor conductivity, and poor cycle stability. Poor safety performance

Method used

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  • A kind of sulfur/vanadium disulfide/mxene composite material and its preparation method and application
  • A kind of sulfur/vanadium disulfide/mxene composite material and its preparation method and application
  • A kind of sulfur/vanadium disulfide/mxene composite material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0047] This comparative example is the preparation of vanadium disulfide, and concrete steps are as follows:

[0048] Weigh 0.232g of ammonium metavanadate and 4ml of ammonia water and stir for 15min, then add 1.504g of thioacetamide, stir and ultrasonically disperse for 1h, then transfer the solution to a 100ml hydrothermal kettle, seal it and place it in an oven at 180°C In constant temperature reaction 20h. After the reaction is naturally cooled, the vanadium disulfide can be obtained by washing with distilled water and ethanol for several times of centrifugation and then freezing and freeze-drying.

Embodiment 2

[0050] The present embodiment is sulfur / vanadium disulfide / MXene (Ti 3 C 2 ) / graphene composite material, the specific steps are as follows:

[0051] (1) Preparation of few-layer MXene(Ti 3 C 2 ): Use an electronic balance to weigh 2g of lithium fluoride, measure 40ml of HCl in a graduated cylinder, place them in a plastic beaker at a constant temperature of 35°C, stir and dissolve for 30min, and then use an electronic balance to weigh the titanium-based MAX (Ti 3 AlC 2 ) phase precursor 2g, slowly put into a plastic beaker at a constant temperature of 35°C and continue to stir for 24 hours; then use distilled water for several times to centrifuge and wash, and when the pH value is close to 7 after ultrasonication, the supernatant is collected and the final product is the few-layer MXene(Ti 3 C 2 ), and finally freeze and freeze-dry the suspension to obtain graphene-like few-layer MXene (Ti 3 C 2 ) solid powder.

[0052] (2) Preparation of vanadium disulfide / MXene(Ti ...

Embodiment 3

[0061] The present embodiment is sulfur / vanadium disulfide / MXene (Ti 3 C 2 ) / graphene composite material, the specific steps are as follows:

[0062] (1) Preparation of few-layer MXene(Ti 3 C 2 ): Take 40ml of 40% HF with a measuring cylinder, pour it into a plastic beaker, and then use an electronic balance to weigh the titanium-based MAX (Ti 3 AlC 2) phase precursor 2g, slowly put it into a plastic beaker under magnetic stirring and continue to react for 24 hours; then use distilled water for several times to centrifuge and wash, and when the pH value is close to 7 after ultrasonication, the supernatant is collected and the final product is the few-layer MXene(Ti 3 C 2 ), and finally freeze and freeze-dry the suspension to obtain graphene-like few-layer MXene (Ti 3 C 2 ) solid powder.

[0063] (2) Preparation of vanadium disulfide / MXene(Ti 3 C 2 ) Nanocomposite material: Weigh 100mg of MXene (Ti 3 C 2 ) solid powder, which is placed in a beaker filled with 30ml d...

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Abstract

The invention relates to the technical field of battery materials, in particular to a sulfur / vanadium disulfide / MXene composite material and a preparation method and application thereof. In the preparation method disclosed in the present invention, the high specific surface area and a large number of active sites of the sulfur-loading material MXene can increase the loading capacity of sulfur; MXene has unique flexibility and good conductivity, so it can buffer the volume change of the positive electrode material And improve the conductivity of the composite material; MXene surface has a large number of functional groups and static electricity can attract vanadate ions and then undergo coordination, so that vanadate ions are evenly adsorbed on the surface of MXene, and the vanadate ions and sulfur source are formed at an appropriate temperature Uniform vanadium disulfide nanosheets are generated in situ on the surface of MXene, and the introduction of catalytically active and conductive vanadium disulfide nanosheets into MXene can chemically adsorb lithium polysulfide, and can quickly convert it into electrolyte in the electrolyte. Insoluble Li 2 S 2 / Li 2 S, thereby inhibiting the severe shuttle effect and improving the stability and cycle life of lithium-sulfur batteries.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a sulfur / vanadium disulfide / MXene composite material and a preparation method and application thereof. Background technique [0002] Nowadays, in order to meet the increasing demand for large-scale energy storage and sustainable use, it is imminent to develop new electrochemical energy storage systems. In the new energy storage system, the theoretical specific energy of a lithium-sulfur battery with metallic lithium as the negative electrode and elemental sulfur as the positive electrode can reach 2600Wh / kg (the theoretical specific capacities of lithium and sulfur are 3860mAh / g and 1675mAh / g, respectively). Much larger than the commercial secondary batteries used at this stage. In addition, lithium-sulfur batteries have attracted extensive attention due to their outstanding advantages of high specific energy, low raw material cost, and environmental friendliness, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/587H01M4/62H01M10/052C01G31/00C01B32/921C01B17/00B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C01B17/00C01G31/00C01P2002/72C01P2004/03C01P2004/61C01B32/921H01M4/362H01M4/38H01M4/5815H01M4/587H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 吴尚有李运勇单炯威王伟钟醉懿
Owner GUANGDONG UNIV OF TECH
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