CN113745508A - Tremella-like MoS2Functionalized activated carbon sodium ion battery cathode material and preparation method thereof - Google Patents

Tremella-like MoS2Functionalized activated carbon sodium ion battery cathode material and preparation method thereof Download PDF

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CN113745508A
CN113745508A CN202111030692.0A CN202111030692A CN113745508A CN 113745508 A CN113745508 A CN 113745508A CN 202111030692 A CN202111030692 A CN 202111030692A CN 113745508 A CN113745508 A CN 113745508A
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mos
hfac
ion battery
tremella
activated carbon
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许占位
严皓
刘鑫悦
陆凡宇
王盈
任宇川
赵家祺
黄剑锋
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Shaanxi University of Science and Technology
Shaanxi Coal and Chemical Technology Institute Co Ltd
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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
    • H01M4/58—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
    • H01M4/581—Chalcogenides or intercalation compounds thereof
    • H01M4/5815—Sulfides
    • 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
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • 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
    • 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
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/027—Negative electrodes
    • 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 invention discloses a silver ear-like MoS2Firstly, carrying out surface treatment on activated carbon by using an improved Hummers method to obtain the functionalized activated carbon with rougher surface and rich active functional groups; then, a Mo source and an S source nucleate and grow on nucleation sites in the temperature rise process by a one-step solvothermal method, the HFAC surface is gradually covered, and the synthesized MoS2the/HFAC is in a silver ear-shaped structure, and the surface of the/HFAC is full of MoS2Nanosheets, HFAC for immobilizing MoS2And ensures good dispersibility, HFAC and MoS2The stable interface combination is realized through C-O-Mo bond connection, the structural collapse caused by stacking of the sheets is effectively relieved, the stability of the composite material is improved, the method is simple to operate,The material has the advantages of low cost, high yield, good repeatability, high specific capacity and excellent cycling stability when being used as a negative electrode material of a sodium ion battery.

Description

Tremella-like MoS2Functionalized activated carbon sodium ion battery cathode material and preparation method thereof
Technical Field
The invention belongs to the technical field of preparation of electrode materials of sodium-ion batteries, and particularly relates to a silver ear-like MoS2A functionalized activated carbon sodium ion battery cathode material and a preparation method thereof.
Background
For many years, lithium ion batteries have been widely studied and applied to portable electronic devices, and have potential applications, such as hybrid electric vehicles and all-electric vehicles, however, currently, worldwide lithium resource reserves are limited, resource distribution is uneven, and prices are high. With the rise of the electric automobile industry, the proportion of the resource consumption of lithium in the battery industry to the total consumption of lithium resources in the world is continuously increased, so that the cost of the lithium ion battery is continuously increased, the market demand of the lithium ion battery which is increasingly increased cannot be met, and the supply is in shortage. In recent years, scientists have actively sought new technologies to replace lithium ion batteries. Elemental sodium and lithium have similar physicochemical properties and electronic configurations. In addition, sodium resources are widely distributed in the earth crust, 2.4 percent of elements exist on the earth, and the sodium-ion battery becomes a promising next-generation secondary battery system capable of being applied in a large scale at low cost. If sodium ion batteries are used to replace commercial lithium ion batteries in our lives, the cost will be reduced by about 30%.
The ionic radius of sodium ions is about 1.4 times the radius of lithium ions, and the limited ion insertion ability of the host material results in an extremely low capacity of the electrode and poor stability due to severe volume changes. Therefore, the challenge faced by sodium ion battery technology is to find electrode materials, particularly suitable anode materials, for rate capability and cycling stability. MoS2As a typical two-dimensional layered transition metal sulfide, the interlayer spacing was 0.62nm, MoS2As an electrode material, a great amount of sodium ions can be contained finally through a conversion reaction process.However, MoS2The electrode has volume change, severe pulverization phenomenon, great loss of active sites and MoS during the conversion reaction2The conductivity is poor, so that the electrode material is poor in electron conductivity.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a Tremella-like MoS2The preparation method has the advantages of low cost, simple preparation, short period and high repeatability, is favorable for large-scale production, and the prepared MoS2The HFAC nano negative electrode material has high specific capacity and excellent cycling stability when being used for a sodium ion battery.
In order to achieve the above object, the present invention provides a Tremella-like MoS2The preparation method of the functionalized activated carbon sodium-ion battery cathode material is characterized by comprising the following steps:
step 1: mixing 0.1-1.0 g of AC and 0.5-2.0 g of NaNO3Dispersing in concentrated sulfuric acid, and then stirring at 30-100 ℃ to obtain a dispersion liquid; 0.5-4.0 g of KMnO4Grinding, gradually adding into the dispersion, diluting with deionized water, standing, centrifuging, washing, and drying to obtain HFAC;
step 2: dispersing 0.01-0.50 g of HFAC in ethanol and carrying out ultrasonic treatment to obtain a solution A; stirring continuously to mix 0.1-1.0 g of Na2MoO4And 0.1 to 1.5g C2H5Dissolving NS in deionized water completely until clear solution B is formed;
and step 3: adding the solution A into the solution B, magnetically stirring, transferring the obtained liquid into a high-pressure reaction kettle, carrying out heat treatment at 100-250 ℃ for 10-20 h, cooling, taking black precipitate at the bottom, and purifying to obtain MoS2/HFAC。
Preferably, the dosage of the concentrated sulfuric acid in the step 1 is 10-100 mL.
Preferably, the stirring in the step 1 is magnetic stirring for 1-5 h.
Preferably, in the step 1, 50-200 mL of deionized water is used for dilution, and the mixture is kept stand for 12-36 hours.
Preferably, in the step 1, the HFAC is obtained by washing with deionized water and absolute ethyl alcohol for several times respectively and freeze-drying for 8-24 hours.
Preferably, the HFAC in the step 2 is dispersed in 10-50 mL of ethanol.
Preferably, Na in said step 22MoO4And C2H5NS is dissolved in 5-20 mL of deionized water.
Preferably, in the step 3, the temperature is increased to 100-250 ℃ at a heating rate of 5-10 ℃/min, and the temperature is cooled to room temperature after heat treatment.
Preferably, the purification process in step 3 is as follows: and respectively washing the black precipitate with deionized water and absolute ethyl alcohol for several times, and drying in a vacuum drying oven at the temperature of 60-100 ℃ for 10-20 h.
The invention also provides a similar silver ear-shaped MoS2The functionalized active carbon sodium ion battery cathode material adopts the argentiferous MoS2The functionalized active carbon sodium ion battery cathode material is prepared by a preparation method, and the material is of a similar-ear-shaped structure and is full of MoS on the surface2Nanosheets.
Compared with the prior art, the preparation method firstly uses an improved Hummers method to carry out surface treatment on the Activated Carbon (AC), and the obtained functionalized activated carbon (HFAC) has a rougher surface and is rich in active functional groups such as-C-OR, -C ═ OR, -COOR and the like; then MoS is obtained by a one-step solvothermal method2and/HFAC. In the temperature rising process, Mo source and S source nucleate and grow on nucleation sites, the HFAC surface is gradually covered, and the synthesized MoS2the/HFAC is in a silver ear-shaped structure, and the surface of the/HFAC is full of MoS2Nanosheets. HFAC for MoS fixation2And ensures good dispersibility, HFAC and MoS2The composite material is connected through a C-O-Mo bond, stable interface combination is realized, structural collapse caused by stacking of the sheets is effectively relieved, and the stability of the composite material is improved.
The invention prepares the Tremella-like MoS2Functional activated carbonSodium ion battery negative electrode material MoS2The method comprises the steps of/HFAC, processing the activated carbon by a modified Hummers method to obtain functionalized activated carbon (HFAC) rich in surface functional groups and using the functionalized activated carbon as a supporting material, nucleating the surface of the HFAC rich in nucleation sites by a simple solvothermal method, and carrying out crystal growth on MoS2Obtaining the tremella-like structure MoS with stable interface2a/HFAC composite electrode material. MoS2Tremella-like structure of HFAC is beneficial to inhibiting MoS2The stacking of the nano sheets improves the structural stability of the material and provides more effective sodium ion intercalation/deintercalation channels. Meanwhile, the tremella fuciformis has the advantage of good water absorption, ensures good electrolyte wettability of the material, provides a micro-field for battery reaction, shortens a diffusion path of sodium ions, and is favorable for realizing rapid sodium storage kinetics and MoS2the/HFAC has high specific capacity and excellent cycling stability when used in the negative electrode material of the sodium-ion battery.
Drawings
FIG. 1 shows the Tremella-like MoS obtained in example 2 of the present invention2HFAC composite material, HFAC and MoS2An XRD pattern of (a);
FIG. 2 shows the Tremella-like MoS obtained in example 2 of the present invention2SEM image of/HFAC composite material;
FIG. 3 shows the Tremella-like MoS prepared in example 2 of the present invention2Long cycle performance plot of/HFAC when used in sodium ion battery negative electrode.
Detailed Description
The present invention will be further explained with reference to the drawings and specific examples in the specification, and it should be understood that the examples described are only a part of the examples of the present application, and not all examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention provides a Tremella-like MoS2The preparation method of the functionalized activated carbon sodium-ion battery cathode material specifically comprises the following steps:
step 1: mixing 0.1-1.0 g of AC and 0.5-2.0 g of NaNO3Is dispersed inIn 10-100 mL of concentrated sulfuric acid, magnetically stirring for 1-5 h at 30-100 ℃ to obtain a dispersion liquid; 0.5-4.0 g of KMnO4Grinding, gradually adding the mixture into a dispersion liquid, diluting the mixture with 50-200 mL of deionized water, and standing for 12-36 hours; centrifuging the diluted mixture, washing the mixture for several times by using deionized water and absolute ethyl alcohol, and freeze-drying the mixture for 8-24 hours to obtain HFAC;
step 2: dispersing 0.01-0.50 g of HFAC in 10-50 mL of ethanol, and carrying out ultrasonic treatment for 10-60 minutes to obtain a dispersion A; stirring continuously to mix 0.1-1.0 g of Na2MoO4And 0.1 to 1.5g C2H5Completely dissolving NS in 5-20 mL of deionized water until a clear solution B is formed;
and step 3: adding the solution A into the dispersion liquid B, magnetically stirring for 1-10 h, transferring the obtained liquid into a high-pressure reaction kettle, heating to 100-250 ℃ at a heating rate of 5-10 ℃/min, keeping the temperature for 10-20 h, cooling to room temperature after heat treatment, taking black precipitate at the bottom, purifying, washing the black precipitate for several times with deionized water and absolute ethyl alcohol respectively, and drying in a vacuum drying oven at 60-100 ℃ for 10-20 h to obtain MoS2HFAC, i.e. Tremella-like MoS2A functionalized activated carbon sodium ion battery cathode material.
The invention also provides the pseudomonad MoS prepared by the method2The functionalized active carbon sodium ion battery cathode material is of a silver ear-like structure, and MoS is fully distributed on the surface2Nanosheets, HFAC for immobilizing MoS2And ensures good dispersibility, HFAC and MoS2Through C-O-Mo bond connection, stable interface combination is realized, structure collapse caused by stacking of sheet layers is effectively relieved, and stability and MoS of the composite material are improved2The HFAC composite material used for the negative electrode of the sodium-ion battery shows high specific capacity and excellent cycling stability.
The present invention will be described in detail with reference to specific examples.
Example 1:
the method comprises the following steps:
(1) 1.0g of AC and 2.0g of NaNO3Dispersing in 100mL of concentrated sulfuric acid, and magnetically stirring at 100 deg.C for 5h to obtain a dispersion, adding 2.0g KMnO4Grinding, gradually adding into the dispersion, diluting the mixture with 200mL of deionized water, and standing for 36 h; centrifuging the diluted mixture, washing with deionized water and ethanol for several times, and freeze-drying for 24h to obtain HFAC;
(2) dispersing 0.50g of HFAC in 50mL of ethanol, and carrying out ultrasonic treatment for 60 minutes to obtain a solution A; by continuing stirring, 1.0g of Na2MoO4And 1.5g C2H5NS is completely dissolved in 20mL of deionized water until a clear solution B is formed;
(3) adding the solution A into the solution B, magnetically stirring for 10h, transferring the obtained liquid into a high-pressure reaction kettle, heating to 200 ℃ at a heating rate of 10 ℃/min, preserving heat for 20h, cooling to room temperature, and taking black precipitate at the bottom; after heat treatment, the black precipitate is respectively washed for a plurality of times by deionized water and absolute ethyl alcohol, and dried for 20 hours in a vacuum drying oven at 100 ℃ to obtain MoS2a/HFAC composite material.
Example 2:
the method comprises the following steps:
(1) 0.4g of AC and 1.0g of NaNO were mixed3Dispersing in 50mL of concentrated sulfuric acid, and magnetically stirring at 80 deg.C for 1h to obtain a dispersion, adding 2.0g KMnO4Grinding, gradually adding into the dispersion, diluting the mixture with 100mL of deionized water, and standing for 36 h; centrifuging the diluted mixture, washing with deionized water and ethanol for several times, and freeze-drying for 20h to obtain HFAC;
(2) dispersing 0.03g of HFAC in 20mL of ethanol, and carrying out ultrasonic treatment for 30 minutes to obtain a solution A; by continuing stirring, 0.24g of Na2MoO4And 0.45g C2H5NS is completely dissolved in 10mL of deionized water until a clear solution B is formed;
(3) adding the solution A into the solution B, magnetically stirring for 1h, transferring the obtained liquid into a high-pressure reaction kettle, heating to 200 ℃ at the heating rate of 5 ℃/min, preserving the heat for 20h, cooling to room temperature, and taking black precipitate at the bottom; after heat treatment, the black precipitate is treated by deionized water and anhydrous ethylRespectively washing with alcohol for several times, and drying in vacuum drying oven at 60 deg.C for 20 hr to obtain MoS2a/HFAC composite material.
As shown in FIG. 1, FIG. 1 illustrates MoS2HFAC and pure phase MoS2X-ray diffraction pattern of (1), comparative sample pure phase MOS2The preparation of (1): through the synthesis of MoS2Similar synthesis method of/HFAC without adding HFAC and preparing MoS2As a control, the diffraction spectra of these two samples showed 2H MoS2The corresponding major diffraction peak (JCPDS 37-1492). Diffraction peaks at 14.4, 32.7, 39.1, 44.2, 49.8, 58.3 and 60.1 ° 2 θ respectively correspond to 2H MoS2The (002), (100), (103), (006), (105), (110) and (108) crystal planes of (A), (B), (C), (D) and (D) crystal planes) of (002), (100), (103), (006), (105), (110) and (108) crystal planes of (108) of (D). The interlayer spacing of the (002) crystal face is 0.62nm calculated by the Bragg equation, and the diffraction peak of the (002) crystal face is sharp, indicating that the layered MoS2Good growth along the c-axis. HFAC has a peak at 26 ° in the form of MoS2The peak of HFAC at 26 ℃ in the/HFAC is not significant because the HFAC addition ratio is small, and the AC is composed of a mixture of short-range ordered crystalline carbon and amorphous carbon, and the crystallinity is not sufficiently strong.
As shown in fig. 2, MoS2The observation result of the low power scanning electron microscope of the/HFAC is shown in (a) in fig. 2, each unit is an irregular block with the particle size of about 5 μm, the surface of the irregular block is covered by thousands of nano-sheets, and a tremella-like structure is presented, and the high power electron microscope of (b) in fig. 2 can observe that the nano-sheets have uniform size and have gaps, so that an effective channel is provided for the embedding and the removing of sodium ions.
As shown in fig. 3, MoS2the/HFAC electrodes are at 0.1 and 0.5A g-1The test result shows that the cycle stability is good in the 500-turn cycle stability test and is 0.1A g-1When the current density of the capacitor is cycled, the initial capacity is up to 772.9 mAh g-1The first coulombic efficiency reaches 68 percent, the first circle reaches a stable value, and the discharge capacity is 510.9mAh g-1The coulombic efficiency was 99.0%, and the discharge capacities at the 100 th, 200 th, 300 th, 400 th and 500 th circles were 501.1, 489.5 th, 482.7 th, 473.7 th and 469.0mAh g-1The battery capacity attenuation rate of 100 circles of each cycle is 1.64 percent; at 0.5A g-1Under the condition, the initial capacity is up to 419.5mAh g-1Third turn of timeReach a stable value, and the discharge capacity is 395.1mAh g-1The coulombic efficiency was 99.0%, and the discharge capacities at the 100 th, 200 th, 300 th, 400 th and 500 th circles were 382.2, 377.1, 372.2, 367.2 and 361.6mAh g, respectively-1The cell capacity fade rate was 1.70% per 100 cycles. The battery is at 0.1A g-1And 0.5A g-1Under the condition, the capacity attenuation rate of 100 cycles per cycle is less than 2%, and good stability is shown. Pure MoS2The initial capacity of the electrode is 377mAh g-1After 20 cycles, structural collapse resulted in a massive disappearance of active sites and a rapid capacity decline.
Example 3:
the method comprises the following steps:
(1) 0.1g of AC and 0.5g of NaNO3Dispersing in 10mL of concentrated sulfuric acid, and magnetically stirring at 30 deg.C for 1h to obtain a dispersion, adding 4.0g KMnO4Grinding, gradually adding into the dispersion, diluting the mixture with 50mL of deionized water, and standing for 12 h; centrifuging the diluted mixture, washing with deionized water and ethanol for several times, and freeze-drying for 8h to obtain HFAC;
(2) dispersing 0.01g of HFAC in 10mL of ethanol, and carrying out ultrasonic treatment for 10 minutes to obtain a solution A; by continuing stirring, 0.1g of Na2MoO4And 0.1g C2H5NS is completely dissolved in 5mL of deionized water until a clear solution B is formed;
(3) adding the solution A into the solution B, magnetically stirring for 5h, transferring the obtained liquid into a high-pressure reaction kettle, heating to 100 ℃ at the heating rate of 5 ℃/min, preserving the temperature for 10h, cooling to room temperature, and taking black precipitate at the bottom; after heat treatment, the black precipitate is respectively washed for a plurality of times by deionized water and absolute ethyl alcohol, and dried for 20 hours in a vacuum drying oven at 100 ℃ to obtain MoS2a/HFAC composite material.
Example 4:
the method comprises the following steps:
(1) 0.5g of AC and 0.5g of NaNO3Dispersing in 50mL of concentrated sulfuric acid, and magnetically stirring at 40 deg.C for 3h to obtain a dispersion, adding 0.5g KMnO4After grinding, the mixture was gradually added to the dispersion, followed by deionization with 50mLDiluting the mixture with water, and standing for 20 h; centrifuging the diluted mixture, washing with deionized water and ethanol for several times, and freeze-drying for 24h to obtain HFAC;
(2) dispersing 0.3g of HFAC in 50mL of ethanol, and carrying out ultrasonic treatment for 30 minutes to obtain a solution A; by continuing stirring, 1.0g of Na2MoO4And 1.5g C2H5NS is completely dissolved in 20mL of deionized water until a clear solution B is formed;
(3) adding the solution A into the solution B, magnetically stirring for 8h, transferring the obtained liquid into a high-pressure reaction kettle, heating to 100 ℃ at the heating rate of 8 ℃/min, preserving the temperature for 20h, cooling to room temperature, and taking black precipitate at the bottom; after heat treatment, the black precipitate is respectively washed for a plurality of times by deionized water and absolute ethyl alcohol, and dried for 20 hours in a vacuum drying oven at 100 ℃ to obtain MoS2a/HFAC composite material.
Example 5:
the method comprises the following steps:
(1) 0.2g of AC and 0.5g of NaNO3Dispersing in 80mL of concentrated sulfuric acid, and magnetically stirring at 100 deg.C for 2h to obtain a dispersion, adding 3.0g KMnO4Grinding, gradually adding into the dispersion, diluting the mixture with 200mL of deionized water, and standing for one day; centrifuging the diluted mixture, washing with deionized water and ethanol for several times, and freeze-drying for 20h to obtain HFAC;
(2) dispersing 0.15g of HFAC in 50mL of ethanol, and carrying out ultrasonic treatment for 40 minutes to obtain a solution A; by continuing stirring, 0.5g of Na2MoO4And 1.2g C2H5NS is completely dissolved in 20mL of deionized water until a clear solution B is formed;
(3) adding the solution A into the solution B, magnetically stirring for 10h, transferring the obtained liquid into a high-pressure reaction kettle, heating to 150 ℃ at the heating rate of 10 ℃/min, preserving the heat for 20h, cooling to room temperature, and taking black precipitate at the bottom; after heat treatment, the black precipitate is respectively washed for a plurality of times by deionized water and absolute ethyl alcohol, and dried for 15h in a vacuum drying oven at the temperature of 80 ℃ to obtain MoS2a/HFAC composite material.
The invention firstly passes throughTreating Activated Carbon (AC) by a good Hummers method to obtain HFAC, and growing MoS on the surface of the HFAC rich in nucleation sites by a simple solvothermal method2Obtaining the tremella-like structure MoS with stable interface2a/HFAC composite electrode material. The preparation method has the advantages of simple operation, low cost, high yield, good repeatability and the like. M prepared by the methodOS2The negative electrode material of the HFAC sodium-ion battery has high specific capacity and excellent cycling stability.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. Tremella-like MoS2The preparation method of the functionalized activated carbon sodium-ion battery cathode material is characterized by comprising the following steps:
step 1: mixing 0.1-1.0 g of AC and 0.5-2.0 g of NaNO3Dispersing in concentrated sulfuric acid, and then stirring at 30-100 ℃ to obtain a dispersion liquid; 0.5-4.0 g of KMnO4Grinding, gradually adding into the dispersion, diluting with deionized water, standing, centrifuging, washing, and drying to obtain HFAC;
step 2: dispersing 0.01-0.50 g of HFAC in ethanol and carrying out ultrasonic treatment to obtain a solution A; stirring continuously to mix 0.1-1.0 g of Na2MoO4And 0.1 to 1.5g C2H5Dissolving NS in deionized water completely until clear solution B is formed;
and step 3: adding the solution A into the solution B, magnetically stirring, transferring the obtained liquid into a high-pressure reaction kettle, carrying out heat treatment at 100-250 ℃ for 10-20 h, cooling, taking black precipitate at the bottom, and purifying to obtain MoS2/HFAC。
2. The Tremella-like MoS of claim 12The preparation method of the functionalized activated carbon sodium-ion battery cathode material is characterized in that the dosage of concentrated sulfuric acid in the step 1 is 10-100 mL.
3. The Tremella-like MoS of claim 22The preparation method of the functionalized activated carbon sodium-ion battery cathode material is characterized in that the stirring in the step 1 is magnetic stirring for 1-5 hours.
4. The Tremella-like MoS of claim 12The preparation method of the functionalized activated carbon sodium-ion battery cathode material is characterized in that 50-200 mL of deionized water is used for diluting in the step 1, and the solution is kept stand for 12-36 hours.
5. The Tremella-like MoS of claim 12The preparation method of the functionalized activated carbon sodium-ion battery cathode material is characterized in that deionized water and absolute ethyl alcohol are respectively used for washing for a plurality of times in the step 1, and the HFAC is obtained after freeze drying for 8-24 hours.
6. The Tremella-like MoS of claim 12The preparation method of the functionalized activated carbon sodium-ion battery cathode material is characterized in that HFAC in the step 2 is dispersed in 10-50 mL of ethanol.
7. The Tremella-like MoS of claim 12The preparation method of the functionalized activated carbon sodium-ion battery cathode material is characterized in that Na is adopted in the step 22MoO4And C2H5NS is dissolved in 5-20 mL of deionized water.
8. The Tremella-like MoS of claim 12The preparation method of the functionalized activated carbon sodium-ion battery negative electrode material is characterized by comprising the following steps3 heating to 100-250 ℃ at a heating rate of 5-10 ℃/min, and cooling to room temperature after heat treatment.
9. The Tremella-like MoS of claim 12The preparation method of the functionalized activated carbon sodium-ion battery cathode material is characterized in that the purification process in the step 3 is as follows: and respectively washing the black precipitate with deionized water and absolute ethyl alcohol for several times, and drying in a vacuum drying oven at the temperature of 60-100 ℃ for 10-20 h.
10. Tremella-like MoS2A functionalized activated carbon sodium ion battery cathode material, characterized in that the Tremella-like MoS as claimed in any one of claims 1 to 9 is adopted2The functionalized active carbon sodium ion battery cathode material is prepared by a preparation method, and the material is of a similar-ear-shaped structure and is full of MoS on the surface2Nanosheets.
CN202111030692.0A 2021-09-03 2021-09-03 Tremella-like MoS2Functionalized activated carbon sodium ion battery cathode material and preparation method thereof Pending CN113745508A (en)

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