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MXene/mesoporous polypyrrole composite material, preparation method thereof, electrode and energy storage device

A composite material, porous polypyrrole technology, used in hybrid capacitor electrodes, electrical components, battery electrodes, etc., can solve the problems of poor cycle and rate performance, achieve excellent charge accumulation ability, excellent anti-corrosion performance, inhibit production. Effects of hydrogen and zinc dendrite growth

Pending Publication Date: 2022-05-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to aim at the above problems in the application of zinc metal electrodes in batteries or capacitors, resulting in poor cycle and rate performance technical problems, the first aspect of the present invention provides a kind of MXene / mesoporous polypyrrole composite material, Polypyrrole layer with mesoporous structure exists on the surface of MXene sheet

Method used

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  • MXene/mesoporous polypyrrole composite material, preparation method thereof, electrode and energy storage device
  • MXene/mesoporous polypyrrole composite material, preparation method thereof, electrode and energy storage device
  • MXene/mesoporous polypyrrole composite material, preparation method thereof, electrode and energy storage device

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Embodiment 1

[0038] The present embodiment provides a kind of preparation method of MXene / mesoporous polypyrrole composite material (hereinafter marked as MXene-mPPy), and the steps include:

[0039] 1) adding a nonionic surfactant to a solvent to form a micellar solution;

[0040] 2) mixing the micellar solution with the MXene dispersion to obtain a mixed solution;

[0041] 3) add pyrrole monomer and initiator to the mixed solution, carry out polymerization reaction, obtain the intermediate product containing nonionic surfactant and polypyrrole on the surface of MXene;

[0042] 4) washing with a solvent to remove the nonionic surfactant in the intermediate product to obtain the MXene-mPPy of the present invention.

[0043] In this embodiment, what MXene selects is Ti 3 C 2 T x , the preparation method adopts the disclosed liquid phase exfoliation method, specifically: 2g MAX phase material (Ti 3 AlC 2 ) powder and 4 grams of lithium fluoride (LiF) were sequentially added to 40 mL o...

Embodiment 2

[0055] Corrosion and hydrogen evolution reaction at the negative electrode / electrolyte interface are the key problems to be solved in zinc metal batteries. This embodiment provides a use of the MXene / mesoporous polypyrrole composite material of the present invention as a zinc electrode protective layer, and also provides a A kind of zinc electrode containing MXene-mPPy (hereinafter denoted as MXene-mPPy / Zn), its preparation method is to disperse the MXene-mPPy obtained in the above-mentioned embodiment 1 in the solvent, the present embodiment solvent is ethanol, sprays on zinc metal On the sheet / foil, the zinc electrode containing MXene-mPPy on the surface is obtained after the solvent is volatilized. A more specific preparation method is: disperse MXene-mPPy in ethanol to obtain a mass concentration of 1 mg mL -1 The dispersion liquid was sprayed on zinc foil and dried on a heating platform at 80°C to obtain MXene-mPPy / Zn.

[0056] The obtained MXene-mPPy / Zn was characterize...

Embodiment 3

[0059] In addition to corrosion inhibition, the MXene-mPPy layer also has the beneficial technical effect of nucleation-induced growth of Zn. This implementation provides a zinc symmetric battery containing MXene-mPPy. The nucleation performance of the MXene-mPPy of the present invention for metal zinc was evaluated by testing the electrochemical performance of the symmetrical battery.

[0060] The electrode sheets in this symmetrical battery adopt the MXene-mPPy / Zn electrode prepared in Example 2, and the assembly method includes: two identical MXene-mPPy / Zn electrodes, 2M ZnSO 4 The electrolyte solution and the glass fiber separator were assembled into a CR2032 button cell to obtain a symmetrical cell.

[0061] Assembly of the comparison sample: MXene-mPPy was replaced by polypyrrole (PPy) under the same polymerization conditions, mixed with acetylene black and polyvinylidene fluoride (PVDF) at a mass ratio of 8:1:1 to make a slurry coated on Zn On the surface, a comparati...

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Abstract

The invention discloses an MXene / mesoporous polypyrrole composite material and a preparation method thereof, an electrode and an energy storage device.The MXene / mesoporous polypyrrole composite material is characterized in that a polypyrrole layer with a mesoporous structure exists on the surface of an MXene sheet layer, and when the MXene / mesoporous polypyrrole composite material is applied to the electrode of a zinc ion battery or a capacitor, the MXene / mesoporous polypyrrole composite material can be applied to the electrode of the zinc ion battery or the capacitor. The MXene / mesoporous polypyrrole composite material not only shows excellent charge enrichment capability (149F g <-1 >) and relatively low nucleation overpotential, induces Zn < 2 + > to uniformly deposit and grow, but also can be used as a protective layer, avoids corrosion of electrolyte to metal zinc, inhibits hydrogen production and growth of zinc dendrites, obtains a zinc ion battery with excellent rate capability (10A g <-1 >) and long cycle life (more than 3000 times), and has a wide application prospect. The problem that the zinc ion battery in the prior art is poor in circulation and rate capability in application is solved, and the zinc ion battery has important application value and market prospect.

Description

technical field [0001] The invention belongs to the field of new materials and new energy sources, and in particular relates to an MXene / mesoporous polypyrrole composite material, a preparation method thereof, an electrode, and an energy storage device. Background technique [0002] Lithium-ion batteries have been widely used commercially due to their high energy density and long cycle time. However, their increasingly scarce raw materials, harsh manufacturing processes and safety hazards restrict their future development. Metal zinc (Zn) because of its large specific capacity (820mAh g -1 ), low redox potential (-0.76V vs SHE), abundant reserves and low cost, it is considered to be a potential metal anode in the "post-lithium era". [0003] However, the current application of Zn metal anodes in battery systems based on Zn metal anodes faces several problems, including: 1) the relatively negative redox potential compared with the hydrogen potential leads to a pronounced hyd...

Claims

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Application Information

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IPC IPC(8): H01M10/054H01M4/60H01M4/36H01G11/48H01G11/26
CPCH01M4/366H01M4/602H01M10/054H01G11/26H01G11/48Y02E60/10
Inventor 杨树斌张永正
Owner BEIHANG UNIV
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