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A highly stable three-dimensional mxene-cof-li composite metal lithium anode material and its preparation method and application

A mxene-cof-li and composite metal technology, applied in the field of electrode material preparation, can solve the problems of low charge and discharge capacity, poor electrode cycle stability, etc., and achieve the effects of high safety, small polarization phenomenon, and controllable deposition amount

Active Publication Date: 2022-08-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventors have found that although the prior art discloses some composite or loaded metal lithium negative electrode materials, the electrode cycle stability is poor and the charge and discharge capacity is low

Method used

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  • A highly stable three-dimensional mxene-cof-li composite metal lithium anode material and its preparation method and application
  • A highly stable three-dimensional mxene-cof-li composite metal lithium anode material and its preparation method and application
  • A highly stable three-dimensional mxene-cof-li composite metal lithium anode material and its preparation method and application

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preparation example Construction

[0044] In a second aspect of the present invention, a method for preparing a highly stable three-dimensional MXene-COF-Li composite metal lithium negative electrode material is provided, comprising:

[0045] After mixing MXene and COF nanoparticles, a three-dimensional flexible MXene-COF self-supporting film was formed by suction filtration, and then metal lithium was deposited on the three-dimensional flexible MXene-COF self-supporting film.

[0046] In one or more embodiments of the present invention, the mixing of MXene and COF nanoparticles is as follows: adding COF nanoparticles into an aqueous solution of MXene, stirring or ultrasonically treating;

[0047] Preferably, the suction filtration adopts vacuum suction filtration;

[0048] Preferably, the stirring or ultrasonic treatment time is 5-20min, preferably 10min;

[0049] Preferably, after the suction filtration, the drying process of the three-dimensional flexible MXene-COF self-supporting film is further included, ...

Embodiment 1

[0073] The preparation and application of a highly stable three-dimensional MXene-COF-Li composite metal lithium anode material, comprising the following steps ( figure 1 ):

[0074] (1) Etch Ti by acid etching 3 AlC 2 MAX phase powder to obtain Ti 3 C 2 T x MXene aqueous solution with a concentration of 1 mg / mL.

[0075] (2) Using trimesicaldehyde and p-phenylenediamine as raw materials and dioxane as solvent to synthesize COF-LZU1 nanoparticles ( figure 2 ).

[0076] (3) Add COF-LZU1 nanoparticles with a mass of 1.5 mg to 30 mL of Ti 3 C 2 T x The MXene aqueous solution was sonicated for 10 minutes to obtain a uniform mixed solution.

[0077] (4) The mixed solution in step (3) was filtered into MXene-COF self-supporting film by vacuum filtration device, and dried at 60°C for 12h ( Figure 4 ).

[0078] (5) The MXene-COF-Li composite metal lithium anode material was obtained by electrochemically depositing lithium in a 1M LiTFSI-DOL / DME (volume ratio 1:1) liqu...

Embodiment 2

[0081] The preparation and application of a highly stable three-dimensional MXene-COF-Li composite metal lithium anode material, comprising the following steps ( figure 1 ):

[0082] (1) Etch V by acid etching2 AlC MAX phase powder gives V 2 CT x MXene aqueous solution with a concentration of 1 mg / mL.

[0083] (2) COF-LZU1 nanoparticles were synthesized by using trimesicaldehyde and p-phenylenediamine as raw materials and dioxane as solvent.

[0084] (3) Add COF-LZU1 nanoparticles with a mass of 1.5 mg to 30 mL of V 2 CT x The MXene aqueous solution was sonicated for 10 minutes to obtain a uniform mixed solution.

[0085] (4) Using a vacuum filtration device, the mixed solution in step (3) was suction-filtered into an MXene-COF self-supporting film, and dried at 60° C. for 12 h.

[0086] (5) The MXene-COF-Li composite metal lithium anode material was obtained by electrochemically depositing lithium in 1M LiTFSI-DOL / DME (volume ratio 1:1) liquid electrolyte with a CR203...

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Abstract

The invention relates to the technical field of electrode material preparation, in particular to a highly stable three-dimensional MXene-COF-Li composite metal lithium negative electrode material and a preparation method and application thereof. The negative electrode material includes: MXene film, COF nanoparticles and metal lithium; the COF nanoparticles are dispersed in the MXene film, and the metal lithium is distributed in the MXene-COF three-dimensional current collector. The MXene‑COF current collector has a three-dimensional structure, which can encapsulate lithium metal, which can not only reduce the local current density to suppress the growth of lithium dendrites, but also alleviate the volume expansion effect of metal lithium anode during deposition / stripping.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation, in particular to a highly stable three-dimensional MXene-COF-Li composite metal lithium anode material, a preparation method and application thereof, and more particularly, to a three-dimensional self-supporting lithiophilic MXene-COF film A method of stabilizing the negative electrode of metallic lithium as a current collector of metallic lithium. Background technique [0002] The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] The rapid development of new energy electric vehicles, smart electronic products and energy storage grids urgently requires rechargeable secondary batteries with high energy den...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/78H01M4/134H01M4/1395H01M4/38H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/382H01M4/663H01M4/78H01M4/668H01M4/134H01M4/1395H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 冯金奎魏传亮
Owner SHANDONG UNIV
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