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
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[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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