High-stability three-dimensional MXene-COF-Li composite metal lithium negative electrode material, preparation method and application thereof

A mxene-cof-li, 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., achieve high safety, small polarization phenomenon, accelerated electrochemical kinetics. Effect

Active Publication Date: 2021-06-01
SHANDONG UNIV
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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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  • High-stability three-dimensional MXene-COF-Li composite metal lithium negative electrode material, preparation method and application thereof
  • High-stability three-dimensional MXene-COF-Li composite metal lithium negative electrode material, preparation method and application thereof
  • High-stability three-dimensional MXene-COF-Li composite metal lithium negative electrode material, preparation method and application thereof

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preparation example Construction

[0044]In a second aspect of the invention, a method of preparing a highly stable three-dimensional MXENE-COF-Li composite metal lithium negative material, including:

[0045]After mixing MXENE and COF nanoparticles, filtered into a three-dimensional flexible MXENE-COF self-support film, and then deposited on three-dimensional flexible MXENE-COF self-supporting film.

[0046]In one or more embodiments of the invention, MXENE and COF nanoparticles are mixed in the form of aqueous solution of COF nanoparticles to MXENE, stirred or ultrasonic treatment;

[0047]Preferably, the filtration is vacuum filtration method;

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

[0049]Preferably, the filtration also includes a drying process of three-dimensional flexible MXENE-COF self-supporting film, 10-15 h, preferably at 60 ° C for 12 h.

[0050]In one or more embodiments of the invention, the deposition is electrochemical deposition method;

[0051]Preferably, the electr...

Embodiment 1

[0073]Preparation and application of high stable three - dimensional MXENE-COF-Li composite metal lithium negative electrode material, including steps belowfigure 1 ):

[0074](1) etching Ti with acid etching method3ALC2 MAX phase powder get Ti3C2Tx MXENE aqueous solution, its concentration is 1 mg / ml.

[0075](2) Synthesis of COF-LZU1 nanoparticles in a solvent based on benzophenylene formaldehyde and phenylenediamine.figure 2 ).

[0076](3) Add a COF-LZU1 nanoparticle having a mass of 1.5 mg to 30 ml of Ti3C2Tx In the MXENE aqueous solution, ultrasonic 10 minute, resulting in a homogeneous mixed solution.

[0077](4) The mixed solution in step (3) is filtered into MXENE-COF self-support films using a vacuum filtration device, and under 60 ° C for 12 h (Figure 4 ).

[0078](5) Electrochemical deposition of lithium lithium negative electrode material was obtained by electrochemical deposition of lithium in 1 m Litfsi-Dol / DME (volume ratio 1: 1) liquid electrolyte by CR2032 type buckle battery....

Embodiment 2

[0081]Preparation and application of high stable three - dimensional MXENE-COF-Li composite metal lithium negative electrode material, including steps belowfigure 1 ):

[0082](1) Etching V by acid etching2Alc max phase powder gets V2CTx MXENE aqueous solution, its concentration is 1 mg / ml.

[0083](2) Amplity is a solvent synthesis of COF-LZU1 nanoparticles in a single benzophenylene and p-phenylenediamine.

[0084](3) Add a mass of 1.5 mg of COF-LZU1 nanoparticles to 30 ml of V.2CTx In the MXENE aqueous solution, ultrasonic 10 minute, resulting in a homogeneous mixed solution.

[0085](4) The mixed solution in step (3) was filtered into a MXENE-COF self-support film with a vacuum filtration device, and under 60 ° C for 12 h.

[0086](5) Electrochemical deposition of lithium lithium negative electrode material was obtained by electrochemical deposition of lithium in 1 m Litfsi-Dol / DME (volume ratio 1: 1) liquid electrolyte by CR2032 type buckle battery. Deposition current is 0.5mA / cm2, Depo...

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Abstract

The invention relates to the technical field of preparation of electrode materials, in particular to a high-stability three-dimensional MXene-COF-Li composite metal lithium negative electrode material, a preparation method and application thereof. The negative electrode material comprises: an MXene film, COF nanoparticles and metal lithium; the COF nanoparticles are dispersed in the MXene film, and the metal lithium is distributed in a MXene-COF three-dimensional current collector. The MXene-COF current collector has a three-dimensional structure, and metal lithium can be wrapped in the MXene-COF current collector, so that the local current density can be reduced, the growth of lithium dendrites can be inhibited, and the volume expansion effect of a metal lithium negative electrode in deposition / stripping can be relieved.

Description

Technical field[0001]The present invention relates to the technical field of electrode material preparation, and more particularly to a highly stable three-dimensional MXENE-COF-Li composite metal lithium negative electrode material and a preparation method and application thereof, and more particularly to a three-dimensional self-support lithium MXENE-COF film As a concentrate of metal lithium, a method of stabilizing metal lithium negative electrode is stabilized.Background technique[0002]The information disclosed in the background is only intended to increase the understanding of the overall background of the present invention, and is not necessarily considered to recognize or imply that the information is intended to be a prior art known to those of ordinary skill in the art.[0003]The rapid development of new energy electric vehicles, intelligent electronics and energy storage power grids urgently requires high energy density rechargeable secondary batteries. Lithium metal batte...

Claims

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Application Information

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Patent Type & Authority Applications(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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