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Mxene flexible self-supporting lithium-air battery positive electrode material, preparation method thereof, Mxene flexible composite membrane and preparation method of Mxene flexible composite membrane

A battery cathode, self-supporting technology, applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, circuits, etc. The effect of high mechanical stability and easy transfer

Inactive Publication Date: 2020-12-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon materials tend to decompose above 3.5V during battery cycling and react with discharge products to form Li 2 CO 3 , causing capacity fading and battery polarization problems

Method used

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  • Mxene flexible self-supporting lithium-air battery positive electrode material, preparation method thereof, Mxene flexible composite membrane and preparation method of Mxene flexible composite membrane
  • Mxene flexible self-supporting lithium-air battery positive electrode material, preparation method thereof, Mxene flexible composite membrane and preparation method of Mxene flexible composite membrane
  • Mxene flexible self-supporting lithium-air battery positive electrode material, preparation method thereof, Mxene flexible composite membrane and preparation method of Mxene flexible composite membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation method of Mxene flexible self-supporting lithium-air battery cathode material, specifically comprising the following steps:

[0045] (1) Preparation of multilayer Mxene powder material: Dissolve 6g of lithium fluoride in 60mL with a concentration of 12molL -1 concentrated hydrochloric acid solution, mixed and stirred for 10 minutes to obtain a mixed etching solution. 2g Ti 2 AlC was slowly added to the mixed etching solution, stirred in a water bath at 40°C for 24 hours, and then centrifuged to obtain a precipitate. -1 The precipitate was washed several times with dilute hydrochloric acid solution to remove excess lithium fluoride, and then centrifuged and washed three times with deionized water. The obtained precipitate was vacuum-dried at 25°C for 48 hours to obtain a multilayer Mxene powder material. The multilayer Mxene powder material is Ti 2 CT x , where T x One or more of -OH functional group / -F functional group / -O functional group. Ti 2 AlC ...

Embodiment 2

[0054] A preparation method of Mxene flexible self-supporting lithium-air battery cathode material, specifically comprising the following steps:

[0055] (1) Preparation of multi-layer Mxene powder material: Slowly add 1g MAX phase ceramic material into 10mL hydrofluoric acid solution, the concentration of hydrofluoric acid is 40%, stir at room temperature for 24h, centrifuge to obtain precipitate, and then wash repeatedly with deionized water 5 times, the obtained precipitate was vacuum-dried at 25°C for 48 hours to obtain a multi-layer Mxene powder material. The multilayer Mxene powder material is Ti 2 CT x , where T x One or more of -OH functional group / -F functional group / -O functional group.

[0056] The prepared multilayer Mxene powder material has a good layered structure, and the lamellar stacking is serious. Due to the functional groups (OH, F, O) in the adsorbed state on Ti 2 CT x The surface is randomly distributed and there are interactions between layers.

...

Embodiment 3

[0063] A preparation method of Mxene flexible self-supporting lithium-air battery cathode material, specifically comprising the following steps:

[0064] Add 1g lithium fluoride to 10mL 12mol L -1 hydrochloric acid solution, and then slowly add 1gTi Ti while stirring 2 AlC. After the addition was complete, the mixture was stirred in a water bath for 24 h at 35° C. to obtain multilayer Mxene (multilayer Ti 2 CT x Powder material) dispersion liquid, washed 4-5 times with deionized water until the pH is about 6. Afterwards, it was subjected to ultrasonic treatment for 1 h, and centrifuged at 3500 rpm for 1 h to remove the sediment at the bottom to obtain a Mxene dispersion with few layers peeled off. Vacuum filtration was performed with a Celgard 3501 diaphragm to form a flexible Mxene film, followed by vacuum drying at 80°C for 6 hours to obtain a flexible self-supporting electrode of Mxene.

[0065] Such as Figure 4 As shown, the prepared multilayer Ti 2 CT x The powde...

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Abstract

The invention discloses an Mxene flexible self-supporting lithium-air battery positive electrode material, a preparation method thereof, an Mxene flexible composite membrane and a preparation method of the Mxene flexible composite membrane. The preparation method of the Mxene flexible composite membrane comprises the following steps: etching an MAX-phase ceramic material by using hydrofluoric acidor a villiaumite-hydrochloric acid mixed solution, carrying out ultrasonic stripping, and carrying out vacuum filtration to obtain an Mxene flexible self-supporting lithium-air battery positive electrode; and carrying out further intercalation treatment on the prepared Mxene flexible electrode to obtain a CNT intercalated Mxene / CNT composite flexible electrode (Mxene flexible composite membrane).The prepared flexible electrode has a unique two-dimensional layered structure, is large in specific surface area, high in electronic conductivity and high in electrochemical stability, and can provide a channel for oxygen circulation and electrolyte transmission; and the CNT intercalated composite electrode effectively reduces the stacking of Mxene materials, and provides enough storage space for discharge products. The material and the composite membrane have wide application prospects in the lithium-air battery.

Description

technical field [0001] The invention belongs to the technical field of battery electrode materials, and in particular relates to a Mxene flexible self-supporting lithium-air battery cathode material, a Mxene flexible composite film and a preparation method thereof. Background technique [0002] With the increasing consumption of fossil energy, research on new clean energy is imminent. Electrochemical energy stands out among new energy sources due to its advantages such as high specific energy, long cycle life, high energy conversion efficiency, and no pollution. Among them, the lithium-air battery has an ultra-high theoretical specific energy density of 5210Wh kg -1 (Considering oxygen quality) or 11400Wh kg -1 (Oxygen is not considered), which is 5 to 10 times that of traditional lithium-ion secondary batteries, and is expected to replace gasoline as a new generation of power energy. However, during discharge, lithium ions migrate from the anode to the cathode and react ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M12/08
CPCH01M4/88H01M4/90H01M12/08
Inventor 宋慧宇李芳郑广丽杜丽崔志明
Owner SOUTH CHINA UNIV OF TECH
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