CN110611081A - Amorphous ternary transition metal sulfide/graphene composite material and preparation method thereof - Google Patents

Amorphous ternary transition metal sulfide/graphene composite material and preparation method thereof Download PDF

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Publication number
CN110611081A
CN110611081A CN201810618768.3A CN201810618768A CN110611081A CN 110611081 A CN110611081 A CN 110611081A CN 201810618768 A CN201810618768 A CN 201810618768A CN 110611081 A CN110611081 A CN 110611081A
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China
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transition metal
sncl
composite material
metal sulfide
graphene
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CN201810618768.3A
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Chinese (zh)
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夏晖
房灵哲
林宝伟
徐璟
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Nanjing Tech University
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Nanjing Tech University
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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
    • 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
    • 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
    • H01M4/628—Inhibitors, e.g. gassing inhibitors, corrosion inhibitors
    • 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 an amorphous ternary transition metal sulfide/graphene composite material and a preparation method thereof. According to SnCl2·2H2The mass ratio of the molar weight of O to the graphene oxide is 0.5-5: 30-90, mmol: mg, SnCl2·2H2The molar ratio of O to the transition metal salt is 1-5: 2 to 10, adding SnCl2·2H2O, transition metal salt, C2H5And adding NS into the dispersion liquid of the graphene oxide, uniformly mixing, placing the mixture in a water bath at 50-100 ℃ for reaction, cooling to room temperature after the reaction is finished, washing with water and ethanol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material. The method is realized by adopting a low-temperature water bath method, high-temperature calcination is not needed, and amorphous, agglomeration-free and high-purity powder materials can be preparedThe method has the advantages of simple process, industrial batch production and low energy consumption.

Description

Amorphous ternary transition metal sulfide/graphene composite material and preparation method thereof
Technical Field
The invention belongs to the technical field of electrode material preparation, and relates to an amorphous ternary transition metal sulfide/graphene composite material and a preparation method thereof.
Background
Transition metal sulfides are widely concerned in the fields of supercapacitors, ion batteries, photocatalysis and the like at present due to specific structures and properties of the transition metal sulfides. For the negative electrode material of the ion battery, the transition metal sulfide has higher ion diffusion rate and large theoretical specific volume and specific mass capacity. The transition metal-based binary sulfide has the advantages of abundant minerals, low cost, simple synthesis method, stable performance, no environmental pollution and wide research.
When the amorphous material is applied to the negative electrode of the ion battery, the isotropic characteristic of the amorphous material can effectively relieve the volume expansion of the active substance in the charge and discharge process, release strain and stress and greatly improve the cycle life of the material. Therefore, the synthesis of the amorphous ternary transition metal sulfide greatly helps the solution of the problems faced by the negative electrode of the ion battery.
The synthesis of transition metal sulfides reported at present is mostly carried out by high-temperature hydrothermal (Huang Y, et al. fast Sodium Storage Kinetics of Lantern-like Ti)0.25Sn0.75S2Connected via Carbon Nanotubes[J]2017,11.) and high temperature solid phase vulcanization (Liu Y, et al2Ultrathin Nanosheets in Hollow Carbon Nanostructures for Efficient Capacitive SodiumStorage[J]2018), but both methods have the problems of high energy consumption, complex synthetic steps, easy agglomeration and no industrial production.
Disclosure of Invention
The invention aims to provide an amorphous ternary transition metal sulfide/graphene composite material and a preparation method thereof.
The technical scheme for realizing the purpose of the invention is as follows:
the preparation method of the amorphous ternary transition metal sulfide/graphene composite material comprises the following steps:
according to SnCl2·2H2The mass ratio of the molar weight of O to the graphene oxide is 0.5-5: 30-90, mmol: mg, SnCl2·2H2The molar ratio of O to the transition metal salt is 1-5: 2 to 10, adding SnCl2·2H2O, a transition metal salt,C2H5And adding NS into the dispersion liquid of the graphene oxide, uniformly mixing, placing the mixture in a water bath at 50-100 ℃ for reaction, cooling to room temperature after the reaction is finished, washing with water and ethanol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material.
Preferably, said SnCl2·2H2The mass ratio of the molar weight of O to the graphene oxide is 2:60, mmol: and (5) mg.
Preferably, the transition metal salt may be selected from a cobalt salt, a molybdenum salt, an iron salt, or a manganese salt.
Preferably, said C2H5NS and SnCl2·2H2The molar ratio of O is 4-10: 1 to 3.
Preferably, the water bath reaction time is 5-24 h.
The invention also provides the amorphous ternary transition metal sulfide/graphene composite material prepared by the preparation method.
Compared with the prior art, the invention has the following advantages:
the preparation method disclosed by the invention is synthesized by a simple one-step water bath method, is short in synthesis time, low in reaction energy consumption, simple in process and controllable in process, and is used for preparing the amorphous ternary transition metal sulfide/graphene composite material. In the amorphous ternary transition metal sulfide/graphene composite material prepared by the invention, the ternary transition metal sulfide uniformly grows on the graphene, the shape is uniform, no agglomeration exists, the amorphous characteristic is realized, and the active substance pulverization phenomenon caused by volume change can be effectively relieved.
Drawings
FIG. 1 is an amorphous ternary transition metal sulfide/graphene (Mo)xSn(1-x)S2-rGO) XRD pattern of the composite material.
FIG. 2 is an amorphous ternary transition metal sulfide/graphene (Mo)xSn(1-x)S2-rGO) SEM image of composite material.
FIG. 3 is an amorphous ternary transition metal sulfide/graphene (Mo)xSn(1-x)S2-rGO) TEM images of the composite.
FIG. 4 is amorphous IIIMeta-transition metal sulfide/graphene (Mo)xSn(1-x)S2-rGO) electrochemical cycling profile of the composite material.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and the accompanying drawings.
Example 1
Adding 2mmol of SnCl2·2H2O、4mmol(NH4)6Mo7O24·4H2O、6mmol C2H5And adding NS into the dispersion liquid containing 60mg of graphene oxide, uniformly mixing in an ultrasonic cleaning machine, placing in a water bath at 100 ℃ for reaction, cooling to room temperature after the reaction is finished, cleaning with deionized water and absolute ethyl alcohol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material.
Example 2
1mmol of SnCl2·2H2O、2mmol(NH4)6Mo7O24·4H2O、6mmol C2H5And adding NS into the dispersion liquid containing 60mg of graphene oxide, uniformly mixing in an ultrasonic cleaning machine, placing in a water bath at 100 ℃ for reaction, cooling to room temperature after the reaction is finished, cleaning with deionized water and absolute ethyl alcohol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material.
Example 3
Adding 5mmol SnCl2·2H2O、10mmol(NH4)6Mo7O24·4H2O、6mmol C2H5And adding NS into the dispersion liquid containing 60mg of graphene oxide, uniformly mixing in an ultrasonic cleaning machine, placing in a water bath at 100 ℃ for reaction, cooling to room temperature after the reaction is finished, cleaning with deionized water and absolute ethyl alcohol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material.
Comparative example 1
This comparative example is essentially the same as example 1, except that SnCl2·2H2The molar ratio of O to transition metal salt is 1: 1.
4mmol of SnCl2·2H2O、4mmol(NH4)6Mo7O24·4H2O、6mmol C2H5And adding NS into the dispersion liquid containing 60mg of graphene oxide, uniformly mixing in an ultrasonic cleaning machine, placing in a water bath at 100 ℃ for reaction, cooling to room temperature after the reaction is finished, cleaning with deionized water and absolute ethyl alcohol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material.
Comparative example 2
This comparative example is essentially the same as example 1, except that SnCl2·2H2The molar ratio of O to transition metal salt is 2: 1.
4mmol of SnCl2·2H2O、2mmol(NH4)6Mo7O24·4H2O、6mmol C2H5And adding NS into the dispersion liquid containing 60mg of graphene oxide, uniformly mixing in an ultrasonic cleaning machine, placing in a water bath at 100 ℃ for reaction, cooling to room temperature after the reaction is finished, cleaning with deionized water and absolute ethyl alcohol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material.
Due to SnCl2·2H2The molar ratio of O to the transition metal salt is 2:1, and the prepared amorphous ternary transition metal sulfide/graphene (Mo)xSn(1-x)S2-rGO), Sn is a major factor causing material degradation during cycling, and too little transition metal content prevents Sn agglomeration and pulverization during charge and discharge cycling, thereby reducing the cycle life of the battery.
Comparative example 3
This comparative example is essentially the same as example 1, except that SnCl2·2H2The mass ratio of the molar weight of O to the graphene oxide is 2mmol:90 mg.
Adding 2mmol of SnCl2·2H2O、4mmol(NH4)6Mo7O24·4H2O、6mmol C2H5Adding NS into dispersion containing 90mg of graphene oxide, mixing in ultrasonic cleaning machine, and standing at 100 deg.CAnd (3) carrying out water bath reaction, cooling to room temperature after the reaction is finished, washing with deionized water and absolute ethyl alcohol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material.
Due to SnCl2·2H2The mass ratio of the molar weight of O to the graphene oxide is 2mmol:90mg, and the amorphous ternary transition metal sulfide/graphene (Mo) is preparedxSn(1-x)S2-rGO) has an excessively high content of redox graphene, the specific capacity of the material is reduced, so that the advantage of high specific capacity of Sn-based transition metal sulfides is lost.
Comparative example 4
This comparative example is essentially the same as example 1, except that the reaction temperature is 70 ℃.
Adding 2mmol of SnCl2·2H2O、4mmol(NH4)6Mo7O24·4H2O、6mmol C2H5And adding NS into the dispersion liquid containing 60mg of graphene oxide, uniformly mixing in an ultrasonic cleaning machine, carrying out water bath reaction at 70 ℃, cooling to room temperature after the reaction is finished, cleaning with deionized water and absolute ethyl alcohol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material.
Because the reaction temperature is 70 ℃, partial reaction precursors can not completely react after the preparation is finished, and the required centrifugation times are increased in the process of cleaning by deionized water and absolute ethyl alcohol.
As shown in FIG. 1, the amorphous ternary transition metal sulfide/graphene (Mo) prepared by the preparation method of the inventionxSn(1-x)S2-rGO) composite material, it can be seen that the product has only one diffuse steamed bread peak at 30 °, and the product can be determined to be amorphous.
As shown in FIG. 2, the amorphous ternary transition metal sulfide/graphene (Mo) prepared by the preparation method of the inventionxSn(1-x)S2-rGO) composite SEM images, it can be seen that the morphology of graphene is completely preserved and no agglomeration occurs. MoxSn(1-x)S2-rGO cannot be observed in SEM due to the small particles.
As shown in FIG. 3, the amorphous ternary transition metal sulfide/graphene (Mo) prepared by the preparation method of the inventionxSn(1-x)S2-rGO) composite material, it can be seen that ternary metal sulfide of about 10nm size is uniformly distributed on the surface of graphene sheet.
As shown in FIG. 4, the amorphous ternary transition metal sulfide/graphene (Mo) prepared by the preparation method of the inventionxSn(1-x)S2-rGO) electrochemical cycling profile of composite materials in different SnCl2·2H2O and (NH)4)6Mo7O24·4H2The proportion of O has great influence on the electrochemical performance. When the molar ratio of the two is 1:2, the obtained product can stably circulate for 400 circles at the current density of 1A/g, and no obvious attenuation occurs. When the molar ratio of the two is 1:1, the obtained product can only stably circulate for 100 circles at the current density of 1A/g, and the rapid capacity fading occurs in the subsequent circulation process.

Claims (6)

1. The preparation method of the amorphous ternary transition metal sulfide/graphene composite material is characterized by comprising the following steps of:
according to SnCl2·2H2The mass ratio of the molar weight of O to the graphene oxide is 0.5-5: 30-90, mmol: mg, SnCl2·2H2The molar ratio of O to the transition metal salt is 1-5: 2 to 10, adding SnCl2·2H2O, transition metal salt, C2H5And adding NS into the dispersion liquid of the graphene oxide, uniformly mixing, placing the mixture in a water bath at 50-100 ℃ for reaction, cooling to room temperature after the reaction is finished, washing with water and ethanol, and drying to obtain the amorphous ternary transition metal sulfide/graphene composite material.
2. The method according to claim 1, wherein the SnCl is2·2H2The mass ratio of the molar weight of O to the graphene oxide is 2:60, mmol: and (5) mg.
3. The method of claim 1, wherein the transition metal salt is selected from the group consisting of cobalt salt, molybdenum salt, iron salt and manganese salt.
4. The method according to claim 1, wherein C is2H5NS and SnCl2·2H2The molar ratio of O is 4-10: 1 to 3.
5. The preparation method of claim 1, wherein the water bath reaction time is 5-24 h.
6. The amorphous ternary transition metal sulfide/graphene composite material prepared by the preparation method according to any one of claims 1 to 5.
CN201810618768.3A 2018-06-15 2018-06-15 Amorphous ternary transition metal sulfide/graphene composite material and preparation method thereof Pending CN110611081A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111268671A (en) * 2020-01-20 2020-06-12 广东工业大学 Graphene-loaded tin-doped cobalt disulfide composite material and preparation method and application thereof
CN113540457A (en) * 2021-06-11 2021-10-22 南京理工大学 Graphene composite amorphous metal-based sulfide electrode material and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958037A (en) * 2016-07-08 2016-09-21 华东师范大学 Copper sulphide/graphene composite material for negative electrode of sodium-ion battery and preparation method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958037A (en) * 2016-07-08 2016-09-21 华东师范大学 Copper sulphide/graphene composite material for negative electrode of sodium-ion battery and preparation method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
YONG JIANG等: "Rationally Incorporated MoS2/SnS2 Nanoparticles on Graphene Sheets for Lithium-Ion and Sodium-Ion Batteries", 《ACS APPLIED MATERIALS & INTERFACES》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111268671A (en) * 2020-01-20 2020-06-12 广东工业大学 Graphene-loaded tin-doped cobalt disulfide composite material and preparation method and application thereof
CN113540457A (en) * 2021-06-11 2021-10-22 南京理工大学 Graphene composite amorphous metal-based sulfide electrode material and preparation method thereof

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Application publication date: 20191224