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Preparation method and application of a one-dimensional mof@zif core-shell structure

A core-shell structure, ethanol technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low specific capacity and poor rate performance restricting the development of lithium-ion batteries, and meet the needs of high porosity, raw materials and equipment types few, short-term effects

Active Publication Date: 2021-01-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional commercial graphite anode, due to its low specific capacity (372mAh / g), poor rate capability restricts the development of lithium-ion batteries.

Method used

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  • Preparation method and application of a one-dimensional mof@zif core-shell structure
  • Preparation method and application of a one-dimensional mof@zif core-shell structure
  • Preparation method and application of a one-dimensional mof@zif core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1. Preparation of Co-BTC, Zn / Co-BTC, Zn / Co-MOF-74 powders.

[0045] (1) Dissolve 0.43g of 1,3,5-trimesic acid in 90ml of deionized water to form solution A 1 , Dissolve 0.50g cobalt acetate tetrahydrate in 10ml deionized water to form solution B 1 , solution A 1 While preheating to 85°C in a water bath, solution B 1 Add, stir and react at constant temperature for 15 minutes, centrifuge the product, wash it with ethanol, and dry it in an oven at 80°C to obtain Co-BTC powder.

[0046] (2) Dissolve 0.43g of 1,3,5-trimesic acid in 90ml of deionized water to form solution A 2 , 0.053g cobalt acetate tetrahydrate and 0.42g zinc acetate dihydrate were dissolved in 10ml deionized water to form solution B 2 , solution A 2 While preheating to 100°C in an oil bath, solution B 2Add, stir and react at constant temperature for 1 min, centrifuge the product, wash it with ethanol, and dry it in an oven at 80°C to obtain Zn / Co-BTC powder.

[0047] (3) Disperse 0.40g of 2,...

Embodiment 2

[0049] Example 2, Preparation of Co-BTC@ZIF from Co-BTC

[0050] (1) Disperse 80mg of Co-BTC powder in 90ml of ethanol-water mixed solution (V 醇 :V 水 =19:1), forming a homogeneous suspension C 1 , 4g 2-methylimidazole is dissolved in 10ml ethanol-water mixed solution (V 醇 :V 水 =19:1), forming solution D 1 , the C 1 Preheat to 25°C in a water bath, put C 1 Add the solution to 2-methylimidazole solution D 1 , stirred at constant temperature for 90 min.

[0051] (2) The product was centrifuged, washed with ethanol, and dried in an oven at 80°C to obtain Co-BTC@ZIF powder.

[0052] figure 2 The FESEM and TEM images of the Co-BTC@ZIF powder prepared for this example, the FESEM image shows that the original smooth micron wire surface becomes rough, and the TEM image shows a core-shell structure. Figure 5 In the XRD pattern of Co-BTC@ZIF powder prepared for this example, it can be seen that Co-BTC diffraction peaks and ZIF diffraction peaks exist simultaneously, indicatin...

Embodiment 3

[0053] Example 3, Preparation of Zn / Co-BTC@ZIF from Zn / Co-BTC

[0054] (1) Disperse 80mg of Zn / Co-BTC powder in 30ml of ethanol-water mixed solution (V 醇 :V 水 =9:1), forming a homogeneous suspension C 2 , 4g 2-methylimidazole is dissolved in 10ml ethanol-water mixed solution (V 醇 :V 水 =9:1), forming a solution D 2 , the C 2 Preheat to 45°C in a water bath, place C 2 Add the solution to 2-methylimidazole solution D 2 , stirred at constant temperature for 5 min.

[0055] (2) The product was centrifuged, washed with ethanol, and dried in an oven at 80°C to obtain Zn / Co-BTC@ZIF powder.

[0056] image 3 FESEM image and TEM image of Zn / Co-BTC@ZIF powder prepared for this example. The FESEM image shows that the original smooth nanowire surface becomes rough, and the TEM image shows a core-shell structure. Figure 6 In the XRD pattern of Zn / Co-BTC@ZIF powder prepared for this example, it can be seen that Zn / Co-BTC diffraction peaks and ZIF diffraction peaks exist at the sa...

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Abstract

The invention provides fabrication method and application of a one-dimensional MOF@ZIF core-shell structure. The fabrication method comprises the following steps of (1) dispersing different MOF materials in an ethanol water mixed solution to form a uniform suspension liquid C; (2) dissolving 2-methylimidazole in the ethanol water mixed solution to form a solution D; and (3) placing the suspensionliquid C in water bath for preheating to a reaction temperature, pouring a solution D, performing constant-temperature stirring so that conversion among different crystal-structure MOFs can be generated during the process, centrifugally separating a product, sequentially washing the product with ethyl alcohol and deionized water, and finally placing the product in a drying oven for drying to obtain MOF@ZIF core-shell structure powder. The morphology can be maintained after high-temperature carbonization and pickling of the one-dimensional core-shell structure MOF@ZIF core-shell structure, andthe obtained porous carbon@nitrogen doping porous carbon shows excellent electrochemical storage performance due to unique core-shell structure and in-situ nitrogen atom doping. The fabrication methodis simple to operate and is low in cost, the process is easy to control and observe, the conversion among the MOFs material and morphology control are successfully achieved, the prepared MOF@ZIF core-shell structure can have wide application prospect and can be used for storing electrochemical energy.

Description

technical field [0001] The invention belongs to the technical field of functional nanomaterial synthesis, and specifically relates to a general method for preparing MOF@ZIF core-shell structures with different one-dimensional MOFs materials as precursors, and using porous carbon@nitrogen-doped porous carbon derived from it for high performance Anode materials for lithium-ion batteries. Background technique [0002] In recent years, lithium-ion batteries (LIBs) have been widely used in portable electronic devices due to their high energy density and long cycle life. However, the traditional commercial graphite anode, due to its low specific capacity (372mAh / g) and poor rate performance, restricts the development of lithium-ion batteries. Therefore, it is of great significance to develop carbon-based anode materials with high reversible capacity, excellent rate capability and cycle stability. Nanostructured porous carbon can provide high lithium storage performance and excel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525H01M4/36
CPCH01M4/362H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 崔接武张永利余东波王岩郑红梅秦永强舒霞张勇吴玉程
Owner HEFEI UNIV OF TECH
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