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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 of lithium polysulfide in lithium-sulfur batteries, the invention provides an MXene-modified composite separator

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

Embodiment 1

[0059] Liquid Phase Exfoliation of Monolithic Ti by LiF2 and Dilute Hydrochloric Acid 3 C 2

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

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

[0062] (3) Centrifuge and wash the solution obtained in step (2) 10 times (3000rpm, 5min each time) to make the pH of the supernatant reach 6.2, then continue to centrifuge for 1 hour (3000rpm), and collect the supernatant. The liquid is stored under 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) was dried under vacuum at room temperature to obtain Ti 3 C 2 Material.

[0064] Ti produced 3 C 2 SEM images of materials, such as figure 2 shown by figure 2 It can be seen that the prepared Ti 3 C 2 The material is a monolithic material.

[0065] Ti produce...

Embodiment 2

[0068] Liquid Phase Exfoliation of Monolithic Ti by LiF2 and Dilute Sulfuric Acid 3 C 2

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

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

[0071] (3) Wash the obtained solution by centrifugation (3000rpm, 5min each time), so that the pH of the supernatant reaches 6.3, and then continue to centrifuge for 0.5 hours (3000rpm), and collect the supernatant, and dry it in vacuum at room temperature to obtain Ti 3 C 2 Material.

[0072] The Ti obtained in this embodiment 3 C 2 For the SEM image, XRD image and TEM image of the material, please refer to figure 2 , image 3 and Figure 4 , prepared Ti 3 C 2 The material is a single-layer or few-layer material with a nanosheet size of 0.5-1 μm, and the characteristic peak of aluminum in the material has disappeared, indicatin...

Embodiment 3

[0074] Liquid Phase Exfoliation of Monolithic Ti by LiF2 and Concentrated Hydrochloric Acid 3 C 2

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

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

[0077] (3) Wash the obtained solution by centrifugation (3000rpm, 5min each time), so that the pH of the supernatant reaches 6.1, and then continue to centrifuge 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 For the SEM image, XRD image and TEM image of the material, please refer to figure 2 , image 3 and Figure 4 , prepared Ti 3 C 2 The material is a single-layer material with a nanosheet size of 0.5-1 μm, 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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