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A kind of diaphragm lithiation method and lithiated diaphragm

A lithiation and diaphragm technology, applied in the direction of separators/films/diaphragms/spacers, structural parts, electrical components, etc., can solve the problems of uneven lithium dispersion and the formation of dendrites on the surface of the diaphragm, to promote uniformity, The effect of improving lithiation efficiency and improving the uniformity of solution dispersion

Active Publication Date: 2022-07-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the uneven dispersion of lithium in this lithiated solution, it is easy to cause dendrites to form on the surface of the separator.

Method used

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  • A kind of diaphragm lithiation method and lithiated diaphragm
  • A kind of diaphragm lithiation method and lithiated diaphragm
  • A kind of diaphragm lithiation method and lithiated diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] S1. Take 3.0842g of biphenyl and put it into a wide-mouthed bottle, then put the wide-mouthed bottle into a vacuumed glove box for subsequent operations, take 40 mL of anhydrous tetrahydrofuran and pour it into the wide-mouthed bottle, and then add 0.2832g Lithium-magnesium alloy, stir until the alloy no longer dissolves, and then stand for 0.5h to obtain a dispersed lithiation solution.

[0060] S2. Put the Zif-8 coated diaphragm (the polymer matrix is ​​PE-PP-PE composite diaphragm, the total thickness is 25 μm, and the thickness of the three layers is equal; the coating thickness is 3 μm) into the lithiation solution, soaked for 3 hours, and taken out , washed with tetrahydrofuran until the surface of the separator was colorless, and air-dried to obtain a lithiated separator. The preparation of the above-mentioned lithiation solution and the immersion of the separator were carried out at room temperature (21° C.).

Embodiment 2

[0064] SEM, TEM characterization:

[0065] The lithiated diaphragms obtained in Example 1 and Comparative Example 1 were respectively subjected to scanning electron microscopy tests, and the results were shown in figure 1 and figure 2 ; figure 1 is the SEM image of the lithiated separator obtained in Example 1, figure 2 It is the SEM image of the lithiated separator obtained in Comparative Example 1.

[0066] The lithiated separators obtained in Example 1 and Comparative Example 1 were tested by transmission electron microscopy, and the results were shown in image 3 and Figure 4 ; image 3 is the TEM image of the lithiated separator obtained in Example 1, Figure 4 TEM image of the lithiated separator obtained in Comparative Example 1.

[0067] Comparing the SEM image-TEM image of Example 1 with the SEM image-TEM image of Comparative Example 1, it can be seen that the lithiation in Example 1 is uniform, while in Comparative Example 1 there are still some active part...

Embodiment 3

[0070] S1. Take 3.0842g of biphenyl and put it into a wide-mouthed bottle, then put the wide-mouthed bottle into a vacuumed glove box for subsequent operations, take 40 mL of anhydrous tetrahydrofuran and pour it into the wide-mouthed bottle, and then add 0.3000g Lithium-magnesium alloy, stir until the alloy no longer dissolves, and then stand for 0.5h to obtain a dispersed lithiation solution.

[0071] S2, put the Zif-20 coating diaphragm (specification is the same as Example 1) into the lithiation solution and soak for 3h, take out, wash with tetrahydrofuran until the surface of the diaphragm is colorless, and air dry naturally to obtain the lithiated diaphragm. The preparation of the above-mentioned lithiation solution and the immersion of the separator were carried out at room temperature (21° C.).

[0072] Setting a control sample: follow the process of Example 3, except that the lithium-magnesium alloy is replaced with a lithium sheet, and the time for the separator to b...

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Abstract

The invention provides a method for lithiation of a separator and a lithiated separator. The diaphragm lithiation method provided by the present invention includes the following steps: a) dissolving the lithium-magnesium alloy in a mixed solution of biphenyl and tetrahydrofuran to obtain a lithiation solution; b) soaking the diaphragm in the lithiation solution to obtain a Lithium diaphragm. The present invention adopts lithium-magnesium alloy as the lithium source, puts it in a tetrahydrofuran solution, and under the catalysis of biphenyl, the lithium in the lithium-magnesium alloy is extracted into the solution, so as to improve the dispersion uniformity of the solution and promote the uniformity of the lithiation of the diaphragm. At the same time, the magnesium in the lithium-magnesium alloy does not dissolve. Due to the anode protection, magnesium plays a catalytic role in the lithiation process in the reaction, which can effectively improve the lithiation efficiency.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a method for lithiation of a separator and a lithiated separator. Background technique [0002] In order to cope with the depletion and pollution of traditional fossil fuel resources, the development and application of chemical power sources have gradually become the focus. Among them, lithium metal batteries have attracted extensive attention due to their high theoretical specific capacity and green environmental protection. However, lithium metal batteries often produce lithium dendrites and dead lithium during battery cycling, resulting in short circuits and even explosions. According to the Sand's time model, it can be seen that the low lithium ion migration number will cause concentration polarization and further aggravate dendrite growth. [0003] In order to solve the problem of low lithium ion migration number, many researchers currently use electrolyte additi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/409H01M50/449
CPCH01M50/403H01M50/409H01M50/411H01M50/449Y02E60/10
Inventor 尹雪邓伟何邦一周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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