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Preparation method of coating type MOFs/organic composite diaphragm

A diaphragm and organic ligand technology, which is applied in the field of preparation of coated MOFs/organic composite diaphragms, can solve the problems of poor flexibility and fragile pure inorganic diaphragms, and achieve the effects of easy operation, increased cycle performance, and improved safety performance

Inactive Publication Date: 2020-01-24
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure inorganic separator is very fragile and has poor flexibility; the inorganic particles (Al 2 o 3 , SiO 2 、TiO 2 , Al(OH) 3 , Mg(OH) 2 , Zeolite, ZrO 2 etc.) coated on the surface of the organic separator to obtain an inorganic coating separator

Method used

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  • Preparation method of coating type MOFs/organic composite diaphragm
  • Preparation method of coating type MOFs/organic composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) LiNi0.5Co0.2Mn0.3O2 (NCM) electrode material, acetylene black and polyvinylidene fluoride (PVDF) are dispersed in N-methyl-2-pyrrolidone (NMP) at a mass ratio of 8:1:1 After stirring, a uniform slurry is formed, and then the slurry is evenly coated on the aluminum foil, and the coated positive plate is dried in a vacuum drying box to obtain a positive electrode sheet, which is then sliced, pressed and weighed.

[0015] (2) ZIF-67 is a porous structure assembled by metallic cobalt and organic ligands. The typical synthesis of ZIF-67 particles is to dissolve 1.455g cobalt nitrate hexahydrate and 1.642g 2-methylimidazole in 40ml methanol solution respectively, stir to dissolve, then mix and stir the solution for 10 minutes and age at 25℃ 24h. As the reaction proceeded, purple precipitated ZIFs were produced. The purple precipitate was collected by centrifugation, washed repeatedly with absolute ethanol, and dried in vacuum at 80°C for 24 hours.

[0016] (3) Disperse the p...

Embodiment 2

[0019] (1) LiMn 2 O 4 Electrode material, acetylene black and polyvinylidene fluoride (PVDF) are dispersed in N-methyl-2-pyrrolidone (NMP) at a mass ratio of 8:1:1, and a uniform slurry is formed after stirring, and then the slurry is evenly coated It is clothed on aluminum foil, and the coated positive plate is dried in a vacuum drying box to obtain a positive electrode sheet, which is then sliced, pressed, and weighed.

[0020] (2) ZIF-67 is a porous structure assembled by metallic cobalt and organic ligands. The typical synthesis of ZIF-67 particles is to dissolve 1.455g cobalt nitrate hexahydrate and 1.642g 2-methylimidazole in 40ml methanol solution respectively, stir to dissolve, then mix and stir the solution for 10 minutes and age at 25℃ 24h. As the reaction proceeded, purple precipitated ZIFs were produced. The purple precipitate was collected by centrifugation, washed repeatedly with absolute ethanol, and dried in vacuum at 80°C for 24 hours.

[0021] (3) Disperse the p...

Embodiment 3

[0024] (1) LiMn 2 O 4 Electrode material, acetylene black and polyvinylidene fluoride (PVDF) are dispersed in N-methyl-2-pyrrolidone (NMP) at a mass ratio of 8:1:1, and a uniform slurry is formed after stirring, and then the slurry is evenly coated It is clothed on aluminum foil, and the coated positive plate is dried in a vacuum drying box to obtain a positive electrode sheet, which is then sliced, pressed, and weighed.

[0025] (2) ZIF-67 is a porous structure assembled by metallic cobalt and organic ligands. The typical synthesis of ZIF-67 particles is to dissolve 1.455g cobalt nitrate hexahydrate and 1.642g 2-methylimidazole in 40ml methanol solution respectively, stir to dissolve, then mix and stir the solution for 10 minutes and age at 25℃ 24h. As the reaction proceeded, purple precipitated ZIFs were produced. The purple precipitate was collected by centrifugation, washed repeatedly with absolute ethanol, and dried in vacuum at 80°C for 24 hours.

[0026] (3) Disperse the p...

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Abstract

The invention discloses a preparation method of a coating type MOFs / organic composite diaphragm. Metal organic frameworks (MOFs) are also called as porous coordination polymers; metal ions or metal clusters and corresponding organic ligands are connected and assembled through strong coordination bonds, so that the coordination polymers can be formed. The MOFs prepared by the method directly coat the surface of a polyolefin (polypropylene PP, polyethylene PE and the like) diaphragm. Compared with an organic diaphragm, the MOFs / organic composite diaphragm has good electrolyte wettability, high-temperature stability, higher discharge capacity and better cycling stability. It is proved that the MOFs / organic composite diaphragm is a promising battery diaphragm material. With the preparation method adopted, a new way is provided for improving the safety of a lithium ion battery.

Description

Technical field [0001] The invention specifically relates to a preparation method of a coated MOFs / organic composite diaphragm, which belongs to the technical field of lithium ion batteries. Background technique [0002] With the increasing demand for portable electronic devices, electric vehicles and aerospace systems, people continue to pursue advanced rechargeable energy storage technologies with reliable and sustainable electrochemical performance. Although lithium ion batteries (LIBs) have higher energy density and longer service life, they still need to be significantly improved in terms of energy density and safety characteristics. In the past, research on battery materials mainly focused on the modification and synthesis of new electrochemical materials. As a battery component, separators play a vital role in preventing internal short circuits in the positive and negative contacts, and at the same time provide channels for ion transmission. effect. At present, most of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14
CPCH01M50/403H01M50/446Y02E60/10
Inventor 沈建兴李魏任慧敏陈攀丛晓彤蒋新朝
Owner QILU UNIV OF TECH
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