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Preparation method and application of two-dimensional hydrotalcite molecular brush modified PP diaphragm

A technology of hydrotalcite and molecular brush, which is applied in the direction of secondary batteries, structural parts, electrical components, etc., can solve the problems that limit the application of lithium metal batteries, it is difficult to provide flexibility, shrinkage or even puncture, so as to avoid internal bridging of batteries Short circuit, excellent tensile mechanical properties, and the effect of improving flexibility and deformation

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

AI Technical Summary

Problems solved by technology

At present, rigid materials such as silica, aragonite, and diamond-like carbon have been used on the modified separator to inhibit the growth of lithium dendrites. However, this method is still difficult to effectively alleviate the drastic volume change of the electrode during use.
The use of flexible materials such as PP separators is also difficult to provide sufficient flexibility due to their anisotropic structure. During the lithium metal plating / stripping process, it is easy to be stressed and form severe curling or even puncture, resulting in bridging and short circuits inside the battery, further limiting lithium metal batteries. Applications at high capacity, high current density
Therefore, it is still a major challenge to further develop a modified separator with excellent flexibility to alleviate the electrode volume change while suppressing the growth of lithium dendrites.

Method used

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  • Preparation method and application of two-dimensional hydrotalcite molecular brush modified PP diaphragm
  • Preparation method and application of two-dimensional hydrotalcite molecular brush modified PP diaphragm
  • Preparation method and application of two-dimensional hydrotalcite molecular brush modified PP diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 Preparation method and application of a two-dimensional hydrotalcite molecular brush modified PP diaphragm

[0048] 1. Preparation method

[0049] The preparation method of the present embodiment comprises the following steps carried out in sequence:

[0050] S1: Dissolve 1.52kg of ferric nitrate nonahydrate, 4.46kg of zinc nitrate hexahydrate and 0.90kg of urea in 150L of water, stir for 30min, put into a hydrothermal kettle, and react at 120°C for 24h. Subsequently, the obtained product was centrifuged, washed with ethanol and water twice each, and dried at 60° C. to obtain hydrotalcite nanosheets.

[0051] S2: Add 1kg of hydrotalcite nanosheets prepared in S1 into 200L of water, stir ultrasonically until fully dispersed, then add 10mL of vinyltriethoxysiloxane under stirring, and mix for 24h, filter, wash and dry , to obtain hydrotalcite nanosheets with carbon-carbon double bonds on the surface.

[0052] Preparation of detergent: Measure ethyl acetate an...

Embodiment 2-6 2

[0058] Example 2-6 Preparation method and application of two-dimensional hydrotalcite molecular brush modified PP diaphragm

[0059] Examples 2-6 are respectively a preparation method and application of a two-dimensional hydrotalcite molecular brush modified PP separator. The process steps in their preparation methods are similar to those in Example 1, and their applications are also the same as in Example 1.

[0060] The only difference between Examples 2-6 and Example 1 is that the relevant parameters and results are different, see Table 1 for details.

[0061] 1-vinylimidazole, 2-methyl-1-vinylimidazole and 1-allyl-3-vinylimidazolium chloride in the imidazole group-containing ethylenic polymerizable monomer are marked as e, f and g in turn;

[0062] The mass-to-volume ratio of hydrotalcite nanosheets containing carbon-carbon double bonds to imidazole group-containing vinyl monomers is marked as ratio 1; the surface of hydrotalcite nanosheets containing carbon-carbon double ...

Embodiment 7 2

[0068] Example 7 Performance testing of two-dimensional hydrotalcite molecular brush modified PP diaphragm

[0069] (1) Scanning electron micrographs of two-dimensional iron-zinc hydrotalcite molecular brushes

[0070] Scanning electron micrographs were taken of the two-dimensional iron-zinc hydrotalcite molecular brushes prepared in the preparation methods of Examples 1-3 to observe the microstructure, and to observe whether the two-dimensional sheet structure can be maintained after grafting polymers.

[0071] Wherein, the two-dimensional iron-zinc hydrotalcite molecular brush result scanning electron microscope photo that embodiment 1-3 makes is as follows successively figure 1 As shown in (a)-(c), it can be observed that as the amount of imidazole group-containing vinyl polymerized monomer increases from 1L to 4L, the above-mentioned two-dimensional iron-zinc hydrotalcite molecular brush will gradually change from a two-dimensional sheet structure to into a random block s...

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Abstract

The invention discloses a preparation method and application of a two-dimensional hydrotalcite molecular brush modified PP diaphragm. The modified PP diaphragm is prepared by the following steps: taking hydrotalcite nanosheets, introducing double bonds into the hydrotalcite nanosheets through a silane coupling agent, grafting imidazole-containing ethylene polymer monomers by taking the double bonds as active grafting sites, dispersing the obtained intermediate product into water, and blade-coating the surface of the PP diaphragm with the dispersed intermediate product. The two-dimensional hydrotalcite molecular brush modified PP diaphragm disclosed by the invention has rigidity and flexibility, is beneficial to inhibiting growth of lithium dendrites and relieving the problem of volume change of an electrode, and is used for assembling to obtain a lithium metal symmetric battery with excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of diaphragm materials for lithium metal batteries, and relates to a modified PP diaphragm material, in particular to a two-dimensional hydrotalcite molecular brush modified PP diaphragm and its preparation method and application. Background technique [0002] In modern society, a large number of energy-consuming functional devices emerge in an endless stream. From common mobile phones to increasingly popular electric vehicles, energy-intensive devices have become an indispensable and important part of human's daily society. At present, lithium-ion batteries, as one of the most mature clean energy storage devices, have been widely used in various electronic devices and electric vehicles. However, limited by the low energy density and power density, it is difficult for lithium-ion batteries to meet the increasing energy storage needs of industries such as new energy electronics and automobiles. Therefore, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/414H01M10/0525
CPCH01M50/403H01M50/414H01M10/0525
Inventor 吴丁财卢宇恒刘绍鸿崔印刘如亮
Owner SUN YAT SEN UNIV