Preparation method of three-dimensional ordered mesoporous MOF material
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A three-dimensional ordered, mesoporous technology, applied in the field of material chemistry, can solve the problems of electrode material crushing, low charge-discharge specific capacity, poor cycle stability, etc., and achieve the effect of promoting transfer and overcoming low charge-discharge specific capacity.
Active Publication Date: 2019-12-20
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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[0014] Aiming at the deficiencies of the prior art, the present invention provides a method for preparing a three-dimensional ordered mesoporous MOF material, which
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[0038] Add 10 g of styrene and 10 g of polyvinylpyrrolidone into 50 ml of deionized water, stir for 2 hours, then stir for 2 hours in an oil bath in a round bottom flask, the temperature of the oil bath is 70°C, and magnetically stir for 12 hours. Then centrifuge at a speed of 800 rad / min for 3 times, and dry at 60° C. to obtain polystyrene PS spheres.
[0039] Step B: Preparation of 3D ordered mesoporous ZIF8 material
[0040] B1, liquid A: 5mmol zinc nitrate hexahydrate, dispersed in 125ml methanol, liquid B: 20mmol 2-methylimidazole, dispersed in 125ml methanol; pour liquid B into liquid A, and at the same time, add 1g of PS balls in step A Among them, magnetically stir for 3 minutes until uniform, and seal and age for 24 hours.
[0041] B2, after centrifugation, methanol and ethanol were used as solvents, and washed three times respectively; after drying the solid and liquid at 60°C, a 3Dzif8 material with an ordere...
Embodiment 2
[0048] Step A, preparing polystyrene PS microspheres:
[0049] Add 20 g of styrene and 20 g of polyvinylpyrrolidone into 100 ml of deionized water, stir for 5 hours, then stir for 2 hours in an oil bath in a round bottom flask, the temperature of the oil bath is 80°C, and stir for 24 hours. Then centrifuge at 800rad / min for 3 times and dry at 80°C to obtain PS spheres.
[0050] Step B: Preparation of three-dimensional ordered mesoporous zif8 material:
[0051] B1, liquid A: 10mmol zinc nitrate hexahydrate, dispersed in 250ml methanol, liquid B: 40mmol 2-methylimidazole, dispersed in 250ml methanol; pour liquid B into liquid A, and at the same time, add 2g of PS balls in step A to it , stirred for 5 minutes until uniform, sealed and aged for 24 hours.
[0052] B2, after centrifugation, methanol and ethanol were used as solvents, and washed three times respectively; after drying the solid and liquid at 80°C, a 3Dzif8 material with an ordered mesoporous structure was obtained. ...
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Abstract
The invention relates to a preparation method of a three-dimensional ordered mesoporous MOF material. The preparation method comprises the following steps of: the step A, preparing polystyrene PS microspheres; the step B, preparing a three-dimensional ordered mesoporous zif8 material; B1, dispersing a proper amount of zinc nitrate hexahydrate into methanol to obtain a solution A, dispersing a proper amount of 2-methylimidazole into methanol to obtain a solution B, adding the solution B into the solution A, adding 1-2g of PS microspheres obtained in the step A for uniform stirring, sealing, standing and aging; B2, sequentially adopting methanol and ethanol as solvents after centrifuging, and respectively washing for three times; drying the solid and liquid to obtain a 3Dzif8 material with an ordered mesoporous structure; the step C, carbonizing the 3Dzif8 material; putting the 3Dzif8 material in the step B2 into a tubular furnace, performing carbonizing at a high temperature in Ar/H2 mixed gas, and performing cooling to a room temperature to obtain the CNT-3Dzif8. According to the preparation method, the 3D ordered zif8 material is prepared by adoption of a template method, and thethree-dimensional ordered ZnS material is prepared after carbonization, so that the electrochemical performance of the lithium ion battery is improved.
Description
technical field [0001] The invention relates to the technical field of material chemistry, and relates to a method for preparing a high specific capacity lithium-ion battery negative electrode material, in particular to a method for compounding a three-dimensional ordered mesoporous MOF material as a lithium-ion battery negative electrode material. Background technique [0002] Lithium-ion batteries are the latest generation of storage batteries, which have been widely used in people's production and life, and are widely used in portable electronic mobile devices and large-scale electric energy storage devices. Like the traditional batteries we see in our daily life, they are composed of positive electrodes, electrolytes, negative electrodes and other components. During discharge, Li + From the positive electrode, the electrolyte reaches the opposite electrode, and the electrons reach the negative electrode through the external circuit; the charging process Li + Then it mo...
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