MXene modified composite diaphragm, preparation method thereof, and application in lithium-sulphur battery

A composite diaphragm and lithium-sulfur battery technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of poor cycle stability and low efficiency, and achieve low cost, less time-consuming, improved performance and safety effect

Active Publication Date: 2017-11-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of poor cycle stability and low efficiency caused by the shuttle effect o

Method used

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  • MXene modified composite diaphragm, preparation method thereof, and application in lithium-sulphur battery
  • MXene modified composite diaphragm, preparation method thereof, and application in lithium-sulphur battery
  • MXene modified composite diaphragm, preparation method thereof, and application in lithium-sulphur battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0058] Example 1

[0059] Lithium fluoride, dilute hydrochloric acid liquid phase stripping of monolithic Ti 3 C 2

[0060] (1) Dissolve 2 g of LiF in 20 ml of 6M hydrochloric acid and stir to dissolve;

[0061] (2) Take 2 grams of Ti 3 AlC 2 The powder is slowly added to the solution of step (1) within 10 minutes, and stirred at 45°C for 12 hours to dissolve;

[0062] (3) Centrifugally wash the solution obtained in step (2) 10 times (3000rpm, 5min each time) to make the supernatant pH 6.2, then continue centrifugation for 1 hour (3000rpm), and collect the supernatant. The liquid is stored in an argon atmosphere to obtain Ti 3 C 2 Aqueous solution (0.1mg / ml).

[0063] Will get Ti 3 C 2 The aqueous solution (0.1mg / ml) is vacuum dried at room temperature to obtain Ti 3 C 2 material.

[0064] Ti produced 3 C 2 SEM image of the material, such as figure 2 Shown by figure 2 It can be seen that the prepared Ti 3 C 2 The material is a single layer of material.

[0065] Ti produced 3 C 2 XRD pa...

Example Embodiment

[0067] Example 2

[0068] Lithium fluoride, dilute sulfuric acid liquid phase stripping monolithic Ti 3 C 2

[0069] (1) Dissolve 5 g of LiF in 50 ml of 9M sulfuric acid, stir and dissolve under ice bath;

[0070] (2) Take 5 grams of Ti 3 AlC 2 The powder is slowly added to the solution of step (1) within 10 minutes, and stirred at 30°C for 24 hours to dissolve;

[0071] (3) Centrifuge the obtained solution (3000rpm, 5min each time) to make the pH of the supernatant reach 6.3, then continue centrifugation for 0.5 hours (3000rpm), and collect the supernatant, vacuum dry at room temperature to obtain Ti 3 C 2 material.

[0072] Ti obtained in this embodiment 3 C 2 See the SEM image, XRD image and TEM image of the material respectively figure 2 , image 3 with Figure 4 , The prepared Ti 3 C 2 The material is a single-layer or few-layer material with a nanoplate size of 0.5~1μm, and the characteristic peak of aluminum in the material has disappeared, indicating that high-quality Ti can st...

Example Embodiment

[0073] Example 3

[0074] Lithium fluoride and concentrated hydrochloric acid liquid phase stripping of monolayer Ti 3 C 2

[0075] (1) Dissolve 5 g of LiF in 50 ml of 12M concentrated hydrochloric acid, stir to dissolve under ice bath;

[0076] (2) Take 5 grams of Ti 3 AlC 2 The powder is slowly added to the solution of step (1) within 10 minutes, and stirred at 35°C for 36 hours to dissolve;

[0077] (3) Centrifugally wash the obtained solution (3000rpm, 5min each time) to make the pH of the supernatant reach 6.1, then continue centrifugation for 0.5 hours (3000rpm), and collect the supernatant, vacuum dry at room temperature to obtain Ti 3 C 2 material.

[0078] Ti produced 3 C 2 See the SEM image, XRD image and TEM image of the material respectively figure 2 , image 3 with Figure 4 , The prepared Ti 3 C 2 The material is a single-layer material with a nanoplate size of 0.5-1μm, and the characteristic peak of aluminum in the material has disappeared.

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Abstract

The invention discloses an MXene modified composite diaphragm, a preparation method thereof, and application in a lithium-sulphur battery. In the MXene modified composite diaphragm disclosed by the invention, a basal membrane is a polyolefin diaphragm; a modification material is a composite of MXene and a polymer or inorganic particles; and the modification material is attached on the surface at one side of the polyolefin diaphragm. In-situ liquid-phase stripping of the A layer in MAX is carried out; a two-dimensional material MXene is synthesized through one step; and then, after being composited with the polymer or inorganic particles, the MXene material is subjected to suction filtration in vacuum, and attached on the polyolefin diaphragm, so that the MXene modified composite diaphragm is obtained. The MXene modified composite diaphragm is directly put in the lithium-sulphur battery; therefore, the ionic conductivity and the electronic conductivity of the battery are enhanced; simultaneously, polysulfide lithium is strongly adsorbed; the polysulfide lithium shuttle effect is inhibited; and thus, the performance and the security of the battery are greatly improved.

Description

technical field [0001] The invention relates to the field of synthesis and application of two-dimensional material MXene, in particular to an MXene-modified composite diaphragm, a preparation method thereof and application in lithium-sulfur batteries. Background technique [0002] Since the beginning of the 21st century, energy and the environment are two major contemporary hot issues. The extensive use of fossil energy has caused industrial waste gas, wastewater, and waste residues to have a greater impact on the living environment. More and more people have begun to advocate the use of green energy. , the development and utilization of clean energy such as solar energy, wind energy, and nuclear energy are gradually on the agenda, and now there is an urgent need for an efficient energy storage device to store excess energy, and batteries, as an efficient and convenient energy storage device, have also attracted extensive research. interest. From the previous lead-acid batt...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/417H01M50/443H01M50/491H01M50/497
CPCH01M10/052H01M50/403H01M50/431H01M50/449Y02E60/10
Inventor 王海辉高拓王素清
Owner SOUTH CHINA UNIV OF TECH
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