CN109449405A - A kind of sulphur-oxygen doping MXene- carbon nano tube compound material and its application in lithium-sulfur cell - Google Patents

A kind of sulphur-oxygen doping MXene- carbon nano tube compound material and its application in lithium-sulfur cell Download PDF

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CN109449405A
CN109449405A CN201811273402.3A CN201811273402A CN109449405A CN 109449405 A CN109449405 A CN 109449405A CN 201811273402 A CN201811273402 A CN 201811273402A CN 109449405 A CN109449405 A CN 109449405A
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mxene
carbon nano
nano tube
compound material
oxygen doping
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CN109449405B (en
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张永光
王加义
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Zhaoqing South China Normal University Optoelectronics Industry Research Institute
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The present invention relates to lithium sulfur battery anode materials of a kind of height ratio capacity and preparation method thereof.The lithium sulfur battery anode material is a kind of sulphur-oxygen doping MXene- carbon nano tube compound material, the composite material is using MAX phase ceramics powder as raw material, MXene- carbon nano tube compound material is prepared using vapour deposition process, the MXene- carbon nanotube of oxygen doping is obtained by hydrogen peroxide immersion treatment, then sulphur is mixed using ball milling and hot fusion method and is prepared.Sulphur-oxygen doping MXene- carbon nano tube compound material is used as positive electrode and is applied to lithium-sulfur cell, and conductive feature high, surface area is big can effectively adsorb the electric discharge poly- lithium sulfide of intermediate product, reduce shuttle effect.

Description

A kind of sulphur-oxygen doping MXene- carbon nano tube compound material and its in lithium-sulfur cell Application
Technical field
The present invention relates to lithium sulfur battery anode materials of a kind of height ratio capacity and preparation method thereof, in particular to a kind of first to lead to Vapour deposition process preparation MXene doped carbon nanometer pipe is crossed, is received by the MXene- carbon that hydrogen peroxide immersion treatment obtains oxygen doping Then mitron mixes sulphur using ball milling and hot fusion method and is prepared sulphur-compound lithium-sulphur cell positive electrode of oxygen doping MXene- carbon nanotube The method of material, belongs to technical field of material chemistry.
Background technique
Lithium ion secondary battery because having many advantages, such as high working voltage, high-energy density, long-life and memory-less effect, at For the preferred power supply of each electronic product.As electronic equipment further minimizes and electric car, large-scale energy-accumulating power station Rapid development, more stringent requirements are proposed to its power supply by people.Existing lithium ion battery by theoretical specific capacity because being limited It is difficult to meet people's demand, and there is very high theoretical energy density (2600Wh/kg) with the lithium-sulfur cell that sulphur makees anode, it is theoretical Specific capacity reaches 1675mAh/g, and sulphur is cheap, resourceful, hypotoxicity, therefore as the secondary of the high-energy density by favor Battery system.Lithium-sulfur cell generally makees cathode by lithium metal, and sulphur or sulfur-containing compound make anode, with traditional " rocking chair type " lithium from Sub- secondary cell is different, and in lithium-sulfur cell charge and discharge process, sulphur reacts with lithium, and charge and discharge process is cyclic annular S8 points Son forms the process of soluble and insoluble polysulfide.Generated polysulfide ion can be dissolved in electrolysis in charge and discharge process Liquid simultaneously migrates, so that the effect that " shuttles " occur.The generation of " shuttle " effect, directly result in active material loss and The corrosion of cathode of lithium makes circulating battery bad stability.In addition, the insulating properties of elemental sulfur and its final product that discharges, charge and discharge The biggish volume change of anode in journey will lead to the specific discharge capacity decline of lithium-sulfur cell, restrict mentioning for lithium-sulfur cell performance It is high.In recent years, people solve these problems to overcome, from the design of positive electrode, the protection of cathode and electrolyte system Improve etc. has carried out many useful explorations.In these explorations, the achievement of sulphur positive electrode is especially prominent.
MXene, i.e., two-dimentional transition metal carbide or carbonitride, are the novel lamellar two dimensional crystals of a type graphene Material, chemical formula Mn+1Xn, n=1,2,3, M be early stage transition metal element (such as Ti, V, Zn, Hf, Zr, Nb, Ta, Cr, Mo, Sc, Y, Lu, W), X is carbon or/and nitrogen, and fertile material MAX phase is that a kind of chemical formula is Mn+1AXnIt is ternary layered Compound, wherein M, X, n are same as above, and A is major element (the most common are Al, Si).
Summary of the invention
It is an object of the present invention to provide a kind of lithium sulfur battery anode material for deficiency existing for current techniques --- sulphur- The MXene- carbon nano tube compound material of oxygen doping.The preparation method of the composite material includes: to be prepared by vapour deposition process MXene doped carbon nanometer pipe, then the MXene- carbon nanotube of oxygen doping is obtained by hydrogen peroxide immersion treatment, then utilize ball Mill and hot fusion method, which are mixed sulphur and be prepared, obtains sulphur-oxygen doping MXene- carbon nano tube compound material.
The present invention solves technical solution used by the technical problem:
(1) MXene is prepared:
Ground MAX phase ceramics powder is immersed into HF solution, is warming up to 50~90 DEG C, temperature constant magnetic stirring 12~24 hours, Centrifuging and taking obtains product later, is washed with deionized to neutrality, is placed in baking oven 60~80 DEG C of dryings 12~24 hours to obtain the final product MXene。
(2) MXene- carbon nano tube compound material is prepared:
The MXene powder being prepared in step (1) is uniformly layered in porcelain boat, is placed in tube furnace, rises in a nitrogen atmosphere Temperature is warming up to after set temperature to 600~800 DEG C and is passed through catalyst thereto using peristaltic pump, and is passed through hydrogen and second simultaneously Alkynes gas disconnects catalyst, hydrogen and acetylene after continuing 10~30 minutes, it is made to cool to room temperature with the furnace in a nitrogen atmosphere, Product is collected up to MXene- carbon nano tube compound material.
(3) oxygen doping MXene- carbon nano tube compound material is prepared:
1~the 2g of MXene- carbon nano tube compound material prepared in step (2) is taken to be placed in hydrogenperoxide steam generator, it is warming up to 50~ It 80 DEG C, stirs 10~30 minutes, product is collected by centrifugation later and is washed with deionized, then to be placed in 60 DEG C of dryings 12 in baking oven small When up to oxygen doping MXene- carbon nano tube compound material.
(4) sulphur-oxygen doping MXene- carbon nano tube compound material is prepared:
According to mass ratio it is 1 by oxygen doping MXene- carbon nano tube compound material obtained in step (3) and pure phase nanometer sulphur powder: 2~5 are put into ball grinder, using planetary ball mill revolving speed be 500~800r/min under the conditions of 3~5h of mixed processing, will It is heat-treated in the tube furnace that the mixture obtained after ball milling is put under nitrogen protection, obtains sulphur-oxygen doping MXene- carbon and receive Mitron composite material.
In step (1), the mass concentration of the HF solution is 30%~50%, and ceramic powders and HF solution quality ratio are 1: 10-30；The MAX phase ceramics can be Ti3AlC2、Ti2AlC、Cr2One or more of AlC.Obtaining MXene material can be Ti3C2Tx(TxFor functional groups such as-OH ,-F), Ti2CTx(Tx is the functional groups such as-OH ,-F), Cr2CTx(TxFor functions such as-OH ,-F One or more of group).
In step (2), the preparation of the catalyst includes: that 1~2g cobalt acetate is added to 10~20mL toluene solution In, it is spare that ultrasound is uniformly mixed it in 10~30 minutes.
In step (2), the flow velocity of the catalyst is 1~4mL/min, the flow velocity of the nitrogen atmosphere is 100~ 300mL/min, 100~300mL/min of flow velocity of the hydrogen, the flow velocity of the acetylene are 50~100mL/min.
In step (3), the mass concentration of the hydrogenperoxide steam generator is 10~30%.
In step (4), the condition of the heat treatment are as follows: at 100~200 DEG C be heat-treated 8~for 24 hours.
Sulphur-oxygen doping MXene- carbon nano tube compound material is used as the purposes of lithium sulfur battery anode material.
Beneficial effects of the present invention are as follows:
The present invention introduces MXene when preparing lithium sulfur battery anode material, and MXene is a kind of New Two Dimensional stratified material, as Electrode material has the advantage that good conductivity, conducive to the transmission of electronics, large specific surface area, it is possible to provide site is more stored, Lamellar structure is conducive to electrolyte ion rapidly in inter-level diffusion, provides excellent high rate performance, and be the storage of active material More spaces are provided, volume expansion of the two-dimensional layered structure also to occur in lithium-sulfur cell charge and discharge process provides more Cushion space, increase the stability of electrode.
The present invention introduces carbon nanotube, carbon nanotube itself using vapour deposition process when preparing lithium sulfur battery anode material Unique structure has unique advantage in terms of improving sulphur simple substance load factor, and sulphur simple substance can be not only embedded between carbon nanotube Hole in, hollow tube, interlayer gap and the VOID POSITIONS of carbon nanotube can also be embedded in.And carbon nanotube has chemistry The advantages of stability is good, elasticity modulus is big and high mechanical strength, and interlaced reticular structure is formed in the electrodes, effectively subtract The stress that electrode material volume expansion generates in small lithium-sulfur cell charge and discharge process, improves the steady of lithium sulfur battery anode material It is qualitative.
The present invention carries out oxygen doping processing to it when preparing lithium sulfur battery anode material, obtained oxygen doping MXene- carbon Not only electric conductivity is high for nanometer tube composite materials, surface area is big, but also oxygen doping MXene- carbon nano tube compound material surface band There is hydroxyl group, have good wetability with liquid S during being subsequently applied to lithium-sulfur cell and carrying sulphur, convenient for impregnating S, and table The source F- and S in face, which introduces, occurs ion exchange or absorption, S and oxidation Mxene carrier can be carried out chemical bonds, can The effectively absorption electric discharge poly- lithium sulfide of intermediate product, reduces shuttle effect.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Fig. 1 is sulphur-oxygen doping MXene- carbon nanotube compound lithium sulfur battery anode material electric discharge specific volume obtained by embodiment 1 Amount circulation figure.
Fig. 2 is sulphur-oxygen doping MXene- carbon nanotube compound lithium sulfur battery anode material multiplying power obtained by embodiment 1 Performance map.
Specific embodiment
Embodiment 1:
(1) MXene is prepared:
Ground MAX phase ceramics powder is immersed into the HF solution that mass fraction is 40%, ceramic powders and HF solution quality ratio For 1:20,60 DEG C are warming up to, magnetic agitation 18 hours, centrifuging and taking obtained product later, was washed with deionized to neutrality, was placed in baking In case 70 DEG C of dryings 18 hours up to MXene.The MAX phase ceramics are Ti3AlC2.Obtaining MXene material is Ti3C2Tx(TxFor- The functional groups such as OH ,-F).
(2) MXene- carbon nano tube compound material is prepared:
Catalyst is prepared first, 1.5g cobalt acetate is added in 15mL toluene solution, and it is standby that ultrasound is uniformly mixed it in 20 minutes With.The MXene powder being prepared in step (1) is uniformly layered in porcelain boat, is placed in tube furnace, in nitrogen atmosphere (flow velocity To be warming up to 700 DEG C under 200mL/min), it is warming up to after set temperature and is passed through catalyst thereto using peristaltic pump, catalyst Flow velocity is 1mL/min, and is passed through hydrogen (flow velocity 200mL/min) and acetylene (flow velocity 80mL/min) gas simultaneously, is continued It disconnects catalyst, hydrogen and acetylene after twenty minutes, it is made to cool to room temperature with the furnace in a nitrogen atmosphere, collect product to obtain the final product MXene- carbon nano tube compound material.
(3) oxygen doping MXene- carbon nano tube compound material is prepared:
The MXene- carbon nano tube compound material 1.5g prepared in step (2) is taken to be placed in the hydrogen peroxide that mass fraction is 20% molten In liquid, 60 DEG C are warming up to, stirs 20 minutes, product is collected by centrifugation later and is washed with deionized, then is placed in baking oven 60 DEG C Dry 12 hours up to oxygen doping MXene- carbon nano tube compound material.
(4) sulphur-oxygen doping MXene- carbon nano tube compound material is prepared:
According to mass ratio it is 1 by oxygen doping MXene- carbon nano tube compound material obtained in step (3) and pure phase nanometer sulphur powder: 3 are put into ball grinder, using planetary ball mill revolving speed be 600r/min under the conditions of mixed processing 4h, by what is obtained after ball milling Mixture is put into the tube furnace under nitrogen protection, is heat-treated 12h at 150 DEG C, obtains sulphur-oxygen doping MXene- carbon nanotube Composite material.
Fig. 1 is sulphur-oxygen doping MXene- carbon nano tube compound material made from embodiment 1 as lithium sulfur battery anode material When specific discharge capacity under the conditions of 0.2C recycle figure.It may be seen that the lithium-sulfur cell is first under 0.2C current density Specific discharge capacity is up to 1604 mAh/g in secondary circulation, and with the continuous progress of circulation, battery specific capacity constantly declines, circulation Still there are 1174 mAh/g after 100 circles, reflecting the positive electrode has brilliant electrochemistry cycle performance.
Fig. 2 is sulphur-oxygen doping MXene- carbon nanotube compound lithium sulfur battery anode material multiplying power obtained by embodiment 1 Performance map.As seen from the figure, even if under the high current density of 2C, preparation-obtained lithium-sulfur cell still shows 692 mAh/ The capacity of g, and when current density is down to 0.2C again, specific discharge capacity restores again to 1471 mAh/g, this shows the anode Material has excellent high rate performance.
Embodiment 2:
(1) MXene is prepared:
Ground MAX phase ceramics powder is immersed into the HF solution that mass fraction is 30%, ceramic powders and HF solution quality ratio For 1:30,50 DEG C are warming up to, magnetic agitation 12 hours, centrifuging and taking obtained product later, was washed with deionized to neutrality, was placed in baking In case 60 DEG C of dryings 12 hours up to MXene.The MAX phase ceramics are Ti3AlC2.Obtaining MXene material is Ti3C2Tx(TxFor- The functional groups such as OH ,-F).
(2) MXene- carbon nano tube compound material is prepared:
Catalyst is prepared first, 1g cobalt acetate is added in 10mL toluene solution, and it is spare that ultrasound is uniformly mixed it in 10 minutes. The MXene powder being prepared in step (1) is uniformly layered in porcelain boat, is placed in tube furnace, (flow velocity is in nitrogen atmosphere It is warming up to 600 DEG C under 100mL/min), is warming up to after set temperature and is passed through catalyst, the stream of catalyst thereto using peristaltic pump Speed is 2mL/min, and is passed through hydrogen (flow velocity 100mL/min) and acetylene (flow velocity 50mL/min) gas simultaneously, continues 10 Catalyst, hydrogen and acetylene are disconnected after minute, it is made to cool to room temperature with the furnace in a nitrogen atmosphere, collects product up to MXene- Carbon nano tube compound material.
(3) oxygen doping MXene- carbon nano tube compound material is prepared:
The MXene- carbon nano tube compound material 1g prepared in step (2) is taken to be placed in the hydrogenperoxide steam generator that mass fraction is 10% In, 50 DEG C are warming up to, stirs 10 minutes, product is collected by centrifugation later and is washed with deionized, then is placed in baking oven and does for 60 DEG C Dry 12 hours up to oxygen doping MXene- carbon nano tube compound material.
(4) sulphur-oxygen doping MXene- carbon nano tube compound material is prepared:
According to mass ratio it is 1 by oxygen doping MXene- carbon nano tube compound material obtained in step (3) and pure phase nanometer sulphur powder: 2 are put into ball grinder, using planetary ball mill revolving speed be 500r/min under the conditions of mixed processing 3h, by what is obtained after ball milling Mixture is put into the tube furnace under nitrogen protection, is heat-treated 8h at 100 DEG C, obtains sulphur-oxygen doping MXene- carbon nanotube Composite material.
Embodiment 3:
(1) MXene is prepared:
Ground MAX phase ceramics powder is immersed into the HF solution that mass fraction is 50%, ceramic powders and HF solution quality ratio For 1:10,90 DEG C are warming up to, magnetic agitation 24 hours, centrifuging and taking obtained product later, was washed with deionized to neutrality, was placed in baking In case 80 DEG C of dryings 24 hours up to MXene.The MAX phase ceramics are Ti3AlC2.Obtaining MXene material is Ti3C2Tx(TxFor- The functional groups such as OH ,-F).
(2) MXene- carbon nano tube compound material is prepared:
Catalyst is prepared first, 2g cobalt acetate is added in 20mL toluene solution, and it is spare that ultrasound is uniformly mixed it in 30 minutes. The MXene powder being prepared in step (1) is uniformly layered in porcelain boat, is placed in tube furnace, (flow velocity is in nitrogen atmosphere It is warming up to 800 DEG C under 300mL/min), is warming up to after set temperature and is passed through catalyst, the stream of catalyst thereto using peristaltic pump Speed is 4mL/min, and is passed through hydrogen (flow velocity 300mL/min) and acetylene (flow velocity 100mL/min) gas simultaneously, continues 30 Catalyst, hydrogen and acetylene are disconnected after minute, it is made to cool to room temperature with the furnace in a nitrogen atmosphere, collects product up to MXene- Carbon nano tube compound material.
(3) oxygen doping MXene- carbon nano tube compound material is prepared:
The MXene- carbon nano tube compound material 2g prepared in step (2) is taken to be placed in the hydrogenperoxide steam generator that mass fraction is 30% In, 80 DEG C are warming up to, stirs 30 minutes, product is collected by centrifugation later and is washed with deionized, then is placed in baking oven and does for 60 DEG C Dry 12 hours up to oxygen doping MXene- carbon nano tube compound material.
(4) sulphur-oxygen doping MXene- carbon nano tube compound material is prepared:
According to mass ratio it is 1 by oxygen doping MXene- carbon nano tube compound material obtained in step (3) and pure phase nanometer sulphur powder: 5 are put into ball grinder, using planetary ball mill revolving speed be 800r/min under the conditions of mixed processing 5h, by what is obtained after ball milling Mixture is put into the tube furnace under nitrogen protection, is heat-treated at 200 DEG C for 24 hours, and sulphur-oxygen doping MXene- carbon nanotube is obtained Composite material.

Claims (9)

1. a kind of MXene- carbon nano tube compound material of sulphur-oxygen doping, it is characterised in that: the composite material is to first pass through gas phase Sedimentation prepares MXene doped carbon nanometer pipe, then obtains the MXene- carbon nanotube of oxygen doping by hydrogen peroxide immersion treatment, Then sulphur-oxygen doping MXene- carbon nano tube compound material that sulphur is prepared is mixed using ball milling and hot fusion method.
2. a kind of preparation method of the MXene- carbon nano tube compound material of oxygen doping, comprising the following steps:
Step (1) prepares MXene:
Ground MAX phase ceramics powder is immersed into HF solution, is warming up to 50~90 DEG C, temperature constant magnetic stirring 12~24 hours, Centrifuging and taking obtains product later, is washed with deionized to neutrality, is placed in baking oven 60~80 DEG C of dryings 12~24 hours to obtain the final product MXene powder；
Step (2) prepares MXene- carbon nano tube compound material:
The MXene powder being prepared in step (1) is uniformly layered in porcelain boat, is placed in tube furnace, rises in a nitrogen atmosphere Temperature is warming up to after set temperature to 600~800 DEG C and is passed through catalyst thereto using peristaltic pump, while being passed through hydrogen and acetylene Gas stops being passed through catalyst, hydrogen and acetylene after continuing 10~30 minutes, it is made to cool to room with the furnace in a nitrogen atmosphere Temperature collects product up to MXene- carbon nano tube compound material；
Step (3) prepares oxygen doping MXene- carbon nano tube compound material:
1~the 2g of MXene- carbon nano tube compound material prepared in step (2) is taken to be placed in hydrogenperoxide steam generator, the peroxidating The mass concentration of hydrogen is 10~30%, is warming up to 50~80 DEG C, is stirred 10~30 minutes, be collected by centrifugation later product and spend from Sub- water washing, then 60 DEG C of dryings are placed in baking oven 12 hours up to oxygen doping MXene- carbon nano tube compound material；
Step (4) prepares sulphur-oxygen doping MXene- carbon nano tube compound material:
According to mass ratio it is 1 by oxygen doping MXene- carbon nano tube compound material obtained in step (3) and pure phase nanometer sulphur powder: 2~5 are put into ball grinder, using planetary ball mill revolving speed be 500~800r/min under the conditions of 3~5h of mixed processing, will It is heat-treated in the tube furnace that the mixture obtained after ball milling is put under nitrogen protection, obtains sulphur-oxygen doping MXene- carbon and receive Mitron composite material.
3. preparation method according to claim 2, it is characterised in that: in step (1), the mass fraction of the HF solution is The mass ratio of 30-50%, the ceramic powder and HF solution is 1:10-30.
4. preparation method according to claim 2, it is characterised in that: the MAX phase ceramics can be Ti3AlC2、Ti2AlC、 Cr2One or more of AlC, obtaining MXene material can be Ti3C2Tx、Ti2CTx、Cr2CTxOne or more of, wherein TxFor one of-OH ,-F or combinations thereof.
5. preparation method according to claim 2, it is characterised in that: in step (2), the catalyst passes through with lower section Method is made, this method comprises: 1~2g cobalt acetate is added in 10~20mL toluene solution, ultrasound makes it mixed for 10~30 minutes It closes uniformly spare.
6. preparation method according to claim 2, it is characterised in that: in step (2), the flow velocity of the catalyst is 1~ 4mL/min, the flow velocity of the nitrogen atmosphere are 100~300mL/min, flow velocity 100~300mL/min of the hydrogen, described The flow velocity of acetylene is 50~100mL/min.
7. preparation method according to claim 2, it is characterised in that: in step (3), the temperature for impregnating reaction is 50 DEG C -80 DEG C, the reaction time is 10~30 minutes.
8. preparation method according to claim 2, it is characterised in that: in step (4), the condition of the heat treatment are as follows: At 100~200 DEG C heat treatment 8~for 24 hours.
9. the application of the MXene- carbon nano tube compound material of sulphur-oxygen doping according to claim 1, which is characterized in that The MXene- carbon nano tube compound material of the sulphur-oxygen doping is used as the positive electrode of lithium-sulfur cell.
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