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Sulfur/vanadium disulfide/MXene composite material as well as preparation method and application thereof

A technology of vanadium disulfide and composite materials, which is applied in the direction of sulfur compounds, chemical instruments and methods, vanadium compounds, etc., and can solve problems such as poor cycle stability and safety performance, poor fixation of sulfur simple substances, and safety issues

Active Publication Date: 2020-10-23
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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  • Sulfur/vanadium disulfide/MXene composite material as well as preparation method and application thereof
  • Sulfur/vanadium disulfide/MXene composite material as well as preparation method and application thereof
  • Sulfur/vanadium disulfide/MXene composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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 ): Use a measuring cylinder to measure 40% HF 40ml, 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...

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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 as well as a preparation method and application thereof. According to the preparation method disclosed by the invention, the sulfur loading capacity can be improved due to the high specific surface area and a large number of active sites of the sulfur loading material MXene; MXene has unique flexibility and conductivity, so that the volume change of the positive electrode material can be buffered, and the conductivity of the composite material can be improved; the surface of the MXene is provided with a large number of functional groups and static electricity, so that vanadate ions can be attracted to generate a coordination effect; the vanadate ions areuniformly adsorbed on the surface of the MXene, so that the vanadate ions and a sulfur source generate uniform vanadium disulfide nanosheets on the surface of the MXene in situ at a proper temperature; by introducing the vanadium disulfide nanosheet with catalytic activity and high conductivity into MXene, lithium polysulfide can be chemically adsorbed, and the vanadium disulfide nanosheet can bequickly catalyzed and converted into insoluble Li2S2 / Li2S in an electrolyte, so that a serious shuttle effect is inhibited, the stability of the lithium-sulfur battery is improved, and the cycle lifeof the lithium-sulfur battery is prolonged.

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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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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