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Self-assembled MXene/chitosan composite membrane as well as preparation method and application thereof

A technology of chitosan and composite film, which is applied in the direction of non-aqueous electrolyte battery electrodes, structural parts, electrical components, etc., can solve problems such as chapping, limit the application of secondary batteries, and fold a large number of self-supporting MXene films to increase wetting properties, inhibit the formation of metal dendrites, and reduce the effect of nucleation overpotential

Active Publication Date: 2022-01-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors found that there is serious stacking between MXene nanosheets, and the self-supporting MXene film prepared by suction filtration has a large number of folds and even cracks, which limits its application in secondary batteries.

Method used

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  • Self-assembled MXene/chitosan composite membrane as well as preparation method and application thereof
  • Self-assembled MXene/chitosan composite membrane as well as preparation method and application thereof
  • Self-assembled MXene/chitosan composite membrane as well as preparation method and application thereof

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preparation example Construction

[0039] In one or more embodiments of the present invention, a method for preparing a self-assembled MXene / chitosan composite film includes: preparing MXene colloidal solution and chitosan solution, adding chitosan solution to few-layer MXene nano After the sheet colloidal solution is mixed evenly, the self-assembled composite membrane is obtained after suction filtration and drying; the MXene colloidal solution is an aqueous solution of few-layer MXene nanosheets, and the chitosan solution is an acid solution of chitosan.

[0040] Dissolving chitosan in acid to obtain an acid solution of chitosan is beneficial to the positive charge of the amine group in the chitosan molecule combined with the protons in the acid solution, and then self-assembles on the surface of the negatively charged MXene nanosheets. The acid is one of hydrochloric acid, formic acid, acetic acid, lactic acid, malic acid or ascorbic acid, preferably acetic acid. Reasonable acid concentration can promote the...

Embodiment 1

[0054] (1) Take 0.5gTi 3 AlC 2 Put the powder into a mixed solution of 0.5gLiF and 10mL of 6M hydrochloric acid, add 2.5mL of water, stir for 24h, centrifuge, wash to pH 6, and then ultrasonically peel off to obtain a few-layer MXene colloidal solution.

[0055] (2) Dissolving chitosan powder with a deacetylation degree of 90% in 1% acetic acid to form a solution with a chitosan mass fraction of 0.5%.

[0056] (3) Add the MXene colloidal solution of step (1) into the chitosan solution of step (2) and stir magnetically for 2 hours, and the mass ratio of MXene to chitosan is 10:1.

[0057] (4) After the solution mixed in the step (3) is filtered by suction and dried, the MXene / chitosan composite membrane is obtained.

[0058] (5) The MXene / chitosan composite film obtained in step (4) was used as the working electrode, the lithium metal foil was used as the counter electrode, and the ester electrolyte 1M LiPF6 EC / DEC (1:1, v / v, 10% FEC ) under an inert atmosphere, at 0.5mA cm ...

Embodiment 2

[0061] (1) Take 0.5gTi 3 AlC 2 Put the powder into a mixed solution of 0.5gLiF and 10mL of 6M hydrochloric acid, add 2.5mL of water, stir for 24h, centrifuge, wash to pH 6, and then ultrasonically peel off to obtain a few-layer MXene colloidal solution.

[0062] (2) Dissolving chitosan powder with a deacetylation degree of 90% in 1% acetic acid to form a solution with a chitosan mass fraction of 0.5%.

[0063] (3) Add the MXene colloidal solution of step (1) into the chitosan solution of step (2) and stir magnetically for 2 hours, and the mass ratio of MXene to chitosan is 10:1.

[0064] (4) After the solution mixed in the step (3) is filtered by suction and dried, the MXene / chitosan composite membrane is obtained.

[0065] (5) The MXene / chitosan composite film obtained in step (4) was used as the working electrode, the sodium metal foil was used as the counter electrode, and the ester electrolyte 1M NaPF6 EC / DEC (1:1, v / v, 5% FEC ) under an inert atmosphere, at 0.5mA cm -...

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Abstract

The invention belongs to the technical field of composite material preparation, and relates to a self-assembled MXene / chitosan composite membrane as well as a preparation method and application thereof. The composite membrane is formed by stacking layered MXene nanosheets layer by layer, and the surfaces of the layered MXene nanosheets are coated with chitosan in a self-assembled mode. The high regularity of the composite membrane is realized by utilizing self-assembly of the chitosan on the surfaces of MXene nanosheets and weakening stacking among the nanosheets, the composite membrane is directly used as a current collector of a lithium ion battery, and metal plane deposition is induced by utilizing high conductivity of the composite membrane and a large number of surface metal affinity groups (hydroxyl, amido and the like), so that dendritic crystal growth in the operation process of the battery is inhibited, so that safe, stable and efficient operation of the metal negative electrode secondary battery is ensured. Chitosan is used as natural green polysaccharide and is safe and environmentally friendly, and the preparation method of the composite membrane is simple and controllable and is suitable for expanded production.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a self-assembled MXene / chitosan composite film and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Lithium-ion batteries have dominated the energy storage market for the past few decades due to their relatively high energy density and low self-discharge. However, with the continuous progress of society, the energy density of lithium-ion batteries can no longer meet the needs of advanced rechargeable devices. Therefore, metal negative electrodes (lithium, sodium, potassium, zinc, Magnesium, etc.) second...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525H01M10/054H01M4/13
CPCH01M4/628H01M4/624H01M4/13H01M10/0525H01M10/054Y02E60/10
Inventor 冯金奎谭利文
Owner SHANDONG UNIV
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