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Metal-organic framework materials and their preparation methods and applications

A metal-organic framework and modified material technology, applied in structural parts, electrical components, battery pack components, etc., can solve the problem of no obvious improvement in the cycle stability of lithium-ion batteries, and achieve improved cycle stability and uniform pore size distribution. Effect

Active Publication Date: 2022-06-21
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] In the traditional technology, inorganic nanoparticles and nanofibers are used to modify the lithium-ion battery separator. The modified lithium-ion battery separator has high air permeability and high thermal stability, which significantly improves the lithium-ion transmission performance, but is stable to the lithium-ion battery cycle. No significant improvement in sex

Method used

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  • Metal-organic framework materials and their preparation methods and applications
  • Metal-organic framework materials and their preparation methods and applications
  • Metal-organic framework materials and their preparation methods and applications

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preparation example Construction

[0030] The present invention provides a method for preparing a metal organic framework material, comprising the following steps S1, S2 and S3.

[0031] Wherein, step S1: adding the surfactant into the solvent and stirring to dissolve, then adding the material containing metal cobalt ions and the material containing organic ligands, and stirring to obtain a mixed solution.

[0032] The above organic ligands are Preferably, the material containing this organic ligand is trimesic acid (H 3 BTC).

[0033] The above-mentioned material containing metal cobalt ions is selected from one of cobalt acetate tetrahydrate, cobalt sulfate hexahydrate and cobalt nitrate hexahydrate.

[0034] Specifically, the temperature of the above preparation process is 20°C to 30°C, such as 20°C, 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C, 29°C and 30°C , preferably, the preparation temperature is room temperature.

[0035] In a specific example, the surfactant is a non-ionic surfactant, such as...

Embodiment 1

[0059] This embodiment provides a metal-organic framework material Co-BTC, and the specific preparation process is as follows:

[0060] At room temperature, 3 g of polyvinylpyrrolidone was added to a mixed solvent of N,N-dimethylformamide (96 mL) and absolute ethanol (48 mL) with a volume of 2:1, and after stirring and dissolving, 0.25 mmol of acetic acid tetrahydrate was added. Cobalt and 0.25mmol trimesic acid were continuously stirred to obtain a mixed solution; the mixed solution was poured into a 200mL reaction kettle lining; the reaction kettle was placed in a 200 ℃ oven, heated for 8 hours to obtain a reaction product; the reaction product was controlled at a rotational speed of Centrifuge at 7000 rpm for 5 min, wash with absolute ethanol to obtain a purple precipitate; and then vacuum dry the purple precipitate at 60° C. to obtain a metal organic framework material.

Embodiment 2

[0062] This embodiment provides a metal-organic framework material Co-BTC, which is different from Embodiment 1 in that cobalt acetate tetrahydrate is replaced with cobalt sulfate hexahydrate, and the specific preparation process is as follows:

[0063] At room temperature, 3 g of polyvinylpyrrolidone was added to a mixed solvent of N,N-dimethylformamide (96 mL) and absolute ethanol (48 mL) with a volume of 2:1, and after stirring and dissolving, 0.25 mmol hexahydrate sulfuric acid was added. Cobalt and 0.25mmol trimesic acid were continuously stirred to obtain a mixed solution; the mixed solution was poured into a 200mL reaction kettle lining; the reaction kettle was placed in a 200 ℃ oven, heated for 8 hours to obtain a reaction product; the reaction product was controlled at a rotational speed of Centrifuge at 7000 rpm for 5 min, and repeatedly wash with absolute ethanol to obtain a purple precipitate; and then vacuum dry the purple precipitate at 60° C. to obtain a metal or...

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Abstract

The invention discloses a preparation method of a metal organic framework material, the metal organic framework material and applications. The preparation method of the metal organic framework material comprises preparing a mixed solution containing a surfactant, a material containing metal cobalt ions and a material containing an organic ligand; heating the mixed solution to obtain a reactant, centrifuging the reactant, washing and drying. The metal-organic framework material obtained by the above preparation method has a repeated network structure formed by the self-assembly of metal cobalt ions and organic ligands. After the metal-organic framework material is used to modify the diaphragm, it can ensure the high air permeability of the diaphragm and improve the performance of the diaphragm. cycle stability of lithium-ion batteries.

Description

technical field [0001] The invention relates to the field of metal-organic coordination polymer materials, in particular to a metal-organic framework material and a preparation method and application thereof. Background technique [0002] Compared with traditional primary batteries, lithium-ion batteries have obvious advantages such as light weight, high energy density, high specific capacity, long cycle life and no memory effect, and have become a research hotspot in new energy technology. The separator is an integral part of the battery. In a lithium-ion battery, the separator is located between the positive and negative electrodes of the battery, acting as a barrier to isolate the direct contact between the positive and negative electrodes, so that the electrons in the battery cannot freely pass through, but the ions in the electrolyte can freely pass through. Although the separator does not participate in the reaction of the battery, it plays a key role in the performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00H01M50/414H01M50/449H01M10/0525
CPCC08G83/008H01M10/0525Y02E60/10
Inventor 廖友好卢亦铿李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY
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