CN113809298A - Two-dimensional graphite alkyne/MXene composite material and preparation and application thereof - Google Patents
Two-dimensional graphite alkyne/MXene composite material and preparation and application thereof Download PDFInfo
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Abstract
The invention discloses a two-dimensional composite material and preparation and application thereof. The two-dimensional graphite alkyne/MXene composite material is prepared by adopting ultrasonic stripping, surface modification and electrostatic adsorption processes and is applied to a metal lithium composite cathode. The alkyne bond structure in the graphdiyne induces the nucleation of the metallic lithium, the nucleation barrier is reduced, the excellent conductivity of MXene promotes the transmission of lithium ions, the formation of lithium dendrite is effectively inhibited by the synergistic effect of the two, and the metallic lithium composite negative electrode with stable circulation is obtained. And the lithium metal full battery can be matched with the anode material, so that the lithium metal full battery with high capacity, long cycle and excellent rate performance can be obtained.
Description
Technical Field
The invention belongs to the field of new materials, and particularly relates to a two-dimensional graphdiyne/MXene composite material, a preparation method thereof and application of a metal lithium composite cathode.
Background
The metallic lithium has extremely high theoretical specific capacity (3860mAh g-1) And the lowest redox voltage (-3.04V vs. she), are considered to be ideal anode materials for achieving high energy density lithium metal batteries. However, lithium dendrites that grow uncontrollably are generated in the charging and discharging process of the metal lithium negative electrode, which can reduce the cycle life of the battery and bring about potential safety problems such as battery short circuit, and thus the commercialization process of the lithium metal battery is seriously hindered.
MXenes is a novel two-dimensional transition metal carbon/nitride, the corresponding characteristic of quick charge and rich surface chemical property of the MXenes are in accordance with the construction requirement of a dendritic-free metal lithium cathode, however, the MXenes are easy to collapse and restack between layers in the circulation process, so that the nucleation sites of surface metal lithium are reduced, the diffusion rate of lithium ions is reduced, and the regulation and control effect of the MXenes on the lithium deposition behavior is limited. In 2017, a Yury Gogotsi professor prepares a graphene/MXene two-dimensional composite material, the graphene/MXene two-dimensional composite material is used for a super capacitor electrode material, wherein graphene nanosheets are inserted into MXene layers, self-accumulation of the MXene nanosheets is effectively prevented, the interlayer spacing is remarkably improved, and a super capacitor constructed by the graphene/MXene two-dimensional composite material shows excellent volume specific energy and rate capability (adv.Funct.Mater.2017,27,1701264). However by sp2Graphene formed by hybridized carbon is difficult to generate strong interaction with metal atoms theoretically, the adsorption effect of the graphene on lithium atoms is limited, although the lithium affinity performance of the graphene can be improved to a certain extent by introducing heterogeneous atoms and other methods, the heterogeneous atoms are combined with lithium to generate side reaction to form additional lithium salt, and the cycle life of the battery can be further shortened (ACS appl. energy mater.2020,3, 2623) 2633).
The graphyne is a two-dimensional layered material of new carbon and is formed by sp and sp2Due to the characteristics of unique acetylene bond structure, large aperture and the like, the carbon atoms in the two hybrid forms have stronger lithium ion adsorption capacity, low lithium ion diffusion energy barrier and ultrahigh in-plane and interlayer ion mobility (chem.Soc.Rev.2019,48,908), so that the graphdiyne has good performance in inhibiting metal lithium dendrite (nat.Energy2016,1,16010)。
Disclosure of Invention
The invention aims to provide a two-dimensional graphyne/MXene composite material and a preparation method and application thereof. The graphite alkyne/MXene metal lithium composite electrode is prepared by electrodeposition and is matched with a positive electrode material to prepare the lithium metal battery, so that the problem of dendritic crystals of the conventional metal lithium negative electrode is solved, and the reversible capacity, the rate capability and the cycling stability of the lithium metal battery are improved.
In a first aspect, the invention provides a two-dimensional graphite alkyne/MXene composite material, which is formed by stacking two-dimensional MXene and graphite alkyne nanosheets layer by layer.
In a second aspect, the invention provides a preparation method of a two-dimensional graphdiyne/MXene composite material, which comprises the following steps: etching the MAX phase by adopting HF or a mixed solution of HCl and LiF, and preparing an MXene nanosheet dispersion liquid by combining an ultrasonic-assisted stripping method, wherein the concentration of the MXene nanosheet dispersion liquid is 0.5-2 mg/mL; carrying out cation-assisted ultrasonic stripping on the graphite alkyne powder to obtain a cationized graphite alkyne nanosheet dispersion liquid with the concentration of 0.5-2 mg/mL; and mixing and stirring the two dispersion liquids to obtain flocculent precipitates, centrifuging, freezing and drying to obtain the two-dimensional graphdiyne/MXene composite material. Wherein the cation is poly diallyl dimethyl ammonium chloride (PDDA) or polyacrylic acid (PAA).
In a third aspect, the invention provides a metal lithium composite negative electrode, wherein metal lithium is deposited in the two-dimensional graphite alkyne/MXene composite material to prepare the graphite alkyne/MXene metal lithium composite negative electrode, and the negative electrode has good cycle stability and rate capability.
The method for depositing the metal lithium is a melting method or an electrodeposition method; further preferred is an electrodeposition method.
In a fourth aspect, the present invention provides a lithium metal full cell equipped with the above-described lithium metal composite negative electrode.
Advantageous effects
The invention provides a novel two-dimensional graphite alkyne/MXene two-dimensional composite material and a preparation method thereof. The alkyne bond structure in the graphdiyne induces the nucleation of the metallic lithium, the nucleation barrier is reduced, the excellent conductivity of MXene promotes the transmission of lithium ions, the formation of lithium dendrites is effectively inhibited by the synergistic effect of the two, the deposition behavior of the metallic lithium can be effectively controlled, and thus the metallic lithium composite cathode without dendrites and the metallic lithium composite cathode with stable circulation are obtained. And the lithium metal full battery can be matched with the anode material, so that the lithium metal full battery with high capacity, long cycle and excellent rate performance can be obtained. The novel two-dimensional graphite alkyne/MXene two-dimensional composite material and the metal lithium composite electrode thereof have the characteristics of simple preparation process, short time and capability of being prepared massively.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows Ti provided in example 1 of the present invention3C2-TEM image, (b) HRTEM image, (c) AFM image of MXene nanoplatelets
Fig. 2 is a TEM image of a two-dimensional graphdine-PDDA nanosheet provided in example 1 of the present invention;
FIG. 3 is SEM morphology images of lithium metal composite anodes constructed based on different substrates in example 2 and comparative example 1 of the present invention (a) a graphite alkyne/MXene-Li anode, (b) a Cu-Li anode;
FIG. 4 shows the current of 8mA cm for example 3 of the present invention and comparative examples 2 and 3 thereof-2EIS curves after 50 cycles at density.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
Example 1
This example provides a method for preparing a graphdiyne/MXene material, in which Ti is used3AlC2The preparation process of the invention, which is illustrated by the example of the-MAX phase, comprises the following steps:
(1) adding 0.99g LiF into 10mL of 10M HCl solution and magnetically stirring for 5 min; then 1g of Ti3AlC2Slowly adding the powder into the mixed solution within 10min, and magnetically stirring for 24 hours at 35 ℃ until the reaction is complete; washing the reaction product with deionized water, and centrifuging to obtain solid precipitate; washing the collected solid precipitate with deionized water, centrifuging at 3500rmp speed until the pH value of supernatant exceeds 6; dispersing the precipitate in deionized water, performing ultrasonic treatment for 30min under Ar atmosphere, and centrifuging for 1h under 3500rmp to obtain Ti3C2A nanosheet aqueous solution; the resulting Ti was prepared as shown in FIG. 13C2The MXene nanosheets are thin in thickness and have certain light transmittance, and further AFM (atomic force microscopy) tests show that the thickness distribution of the MXene nanosheets is 0.8-1.6 nm, so that the number of layers of the prepared MXene nanosheets is 1-2;
(2) dispersing 10mg of graphdine powder in PDDA, and performing ultrasonic treatment for 12h in Ar atmosphere to obtain graphdine-PDDA dispersion liquid with the concentration of 0.5mg mL-1(ii) a As shown in fig. 2, in order to prepare the graphite alkyne-PDDA nanosheet, fig. 2 shows the morphology of the two-dimensional graphite alkyne-PDDA nanosheet, and it can be seen from the figure that the prepared graphite alkyne nanosheet is thin in thickness and about 200nm in transverse dimension;
(3) adding the graphite alkyne-PDDA nanosheet dispersion liquid prepared in the step (2) into the Ti prepared in the step (1)3C2Magnetically stirring the MXene solution for 8 hours to obtain a flocculent product, centrifuging at 2000rmp, and freeze-drying for 24 hours to finally obtain the two-dimensional graphite alkyne/MXene composite material.
Example 2
This example provides a lithium metal composite electrode containing a two-dimensional graphite alkyne/MXene composite material, which is specifically prepared as follows: firstly, coating the graphite alkyne/MXene composite material prepared in the embodiment (1) on copper foil to be used as a working electrode, using metal lithium as a counter electrode, using electrolyte of 1M LiTFSI/DOL: DEM (volume ratio of 1: 1), and using an electrodeposition current density of 1mA cm to prepare the graphite alkyne/MXene metal lithium composite electrode－2The capacity of the electrodeposited metallic lithium is 8mAh cm－2And preparing the graphite alkyne/MXene metallic lithium composite negative electrode (graphite alkyne/MXene-Li).
Comparative example 1
In order to further illustrate the inhibition effect of the graphitic alkyne-MXene material on lithium dendrites, a metal lithium negative electrode (Cu-Li) prepared by a negative electrode current collector copper foil commonly used in a lithium ion battery is selected as a comparative example, and compared with example 2, the difference is that a working electrode prepared by the comparative example 1 is a bare copper foil which is not coated by the graphitic alkyne/MXene.
FIG. 3 shows that the amount of deposited lithium metal was 8mAh cm-2In the process, the surface appearances of the graphite alkyne/MXene-Li electrode and the Cu-Li electrode are the deposition appearances of metal lithium on the surfaces of different substrates (Cu, graphite alkyne/MXene), and as can be seen from the figure, the metal lithium layer on the surface of the graphite alkyne/MXene-Li electrode is in a smooth and uniform deposition appearance, while the metal lithium layer on the surface of the copper foil is in an uneven island-shaped appearance, so that the appearance can easily cause the tip effect, and the growth of dendrites can be easily induced in the battery circulation process.
Example 3
This embodiment provides a full cell containing a graphite alkyne/MXene lithium metal composite electrode, in which a positive electrode material lithium iron phosphate (LiFePO)4) The description is given for the sake of example. The assembly method of the full cell is as follows: using LiFePO4The pole piece is a positive electrode, the graphite alkyne/MXene-Li prepared in example 2 is a negative electrode, the diaphragm is Celgard2400, and the electrolyte is 20 mu L of 1mol L-1LiTFSI-DOL/DME (solvent volume ratio of 1: 1). CR-2032 button cells were assembled in Ar gloves. Wherein LiFePO4The preparation method of the pole piece comprises the following steps: mixing LiFePO4Conductive carbon black (Super C) and a binder (PVDF) according to a mass ratio of 8: 1: 1 is dispersed in NMP solvent and ground for 1 hour by a mortar to obtain evenly dispersed slurry. The slurry is evenly coated on the copper foil by a scraper,drying at 40 deg.C, punching into circular electrode plate with diameter of 12mm, tabletting under 5MPa, and vacuum drying at 120 deg.C for 12 hr. Wherein LiFePO4The loading amount of (2) was 3.36mg cm-2。
Comparative example 2
Compared with example 3, the difference is that the negative electrode of the assembled full cell of comparative example 2 is a graphene/MXene lithium metal composite electrode (graphene/MXene-Li), wherein the preparation method of the graphene/MXene lithium metal composite electrode is the same as that of the graphene/MXene lithium metal composite electrode of example 2.
Comparative example 3
Compared with example 3, the difference is that the negative electrode of the full cell of comparative example 3 is the Cu — Li electrode prepared in comparative example 1.
Fig. 4 shows EI S spectra of the full cells of example 3, comparative example 2 and comparative example 3 after 50 cycles of charging and discharging, and it can be seen from the graphs that the resistance value of the graphdine/MXene-Li electrode is smaller than that of the graphene/MXene-Li and Cu-Li electrodes, which indicates that the graphdine/MXene can optimize the transmission performance of lithium ions in the material compared with the graphene/MXene and copper foil, and is significant for enhancing the electrochemical performance of the cell.
In addition, the full battery of the graphite alkyne/MXene lithium metal composite negative electrode has the characteristics of high capacity, long cycle and excellent rate performance under high current density, and the two-dimensional graphite alkyne/MXene material effectively inhibits the formation of lithium dendrites, so that the metal lithium composite negative electrode constructed by the two-dimensional graphite alkyne/MXene material has excellent cycle stability.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A two-dimensional graphite alkyne/MXene composite material is characterized in that: formed by stacking two-dimensional graphyne and MXene nanosheets layer by layer.
2. The preparation method of the two-dimensional graphdine/MXene composite material, which is the claim 1 belongs to, is characterized in that: preparing MXene by using an MAX phase as a raw material through an etching method, and performing ultrasonic treatment to obtain a monodisperse MXene nanosheet dispersion liquid; taking the graphite alkyne powder as a raw material, and carrying out cation-assisted ultrasonic stripping to obtain a graphite alkyne nanosheet dispersion liquid with monodispersity; and mixing and stirring the two dispersions to obtain flocculent products, collecting, washing, freezing and drying to obtain the two-dimensional graphite alkyne/MXene composite material.
3. The preparation method of the two-dimensional graphdine/MXene composite material according to claim 2, characterized in that: the concentration of the MXene nanosheet dispersion is 0.5-2 mg/mL.
4. The preparation method of the two-dimensional graphdine/MXene composite material according to claim 2, characterized in that: the concentration of the graphite alkyne nanosheet dispersion liquid is 0.5-2 mg/mL.
5. The preparation method of the two-dimensional graphdine/MXene composite material according to claim 2, characterized in that: MXene is prepared by an etching method, wherein an etching agent is HF or a mixed solution of HCl and LiF.
6. The preparation method of the two-dimensional graphdine/MXene composite material according to claim 2, characterized in that: and (3) carrying out ultrasonic stripping with the aid of cations to obtain a monodisperse graphite alkyne nanosheet dispersion liquid, wherein the cations are poly (diallyl dimethyl ammonium) chloride (PDDA) or polyacrylic acid (PAA).
7. The preparation method of the two-dimensional graphdine/MXene composite material according to claim 2, characterized in that: and mixing and stirring the two dispersions to obtain flocculent products, collecting, washing and freeze-drying, wherein the electrical properties of the surfaces of the nanosheets in the two dispersions are opposite, and assembling through electrostatic action to form the two-dimensional graphdiyne/MXene composite material.
8. A lithium metal composite anode characterized in that: filling metallic lithium into the two-dimensional graphite alkyne/MXene composite material of claim 1 to prepare the two-dimensional graphite alkyne/MXene composite material metallic lithium composite negative electrode.
9. The method for preparing the lithium metal composite negative electrode as claimed in claim 8, wherein the method for filling the lithium metal is melting lithium filling or electrodeposition lithium filling.
10. A lithium metal full cell comprising the lithium metal composite anode according to claim 8.
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Cited By (2)
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| CN114551811A (en) * | 2022-02-22 | 2022-05-27 | 北京航空航天大学 | Preparation method of vertical MXene array pole piece, vertical MXene array pole piece and application |
| CN114551888A (en) * | 2022-04-26 | 2022-05-27 | 北京三川烯能科技有限公司 | Method for inhibiting lithium precipitation of lithium ion battery negative electrode, slurry, negative electrode, battery and vehicle |
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| CN114551888A (en) * | 2022-04-26 | 2022-05-27 | 北京三川烯能科技有限公司 | Method for inhibiting lithium precipitation of lithium ion battery negative electrode, slurry, negative electrode, battery and vehicle |
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