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Fabrication method and application of one-dimensional MOF@ZIF core-shell structure

A technology of core-shell structure and ethanol, which is applied in the field of synthesis of functional nanomaterials, can solve the problems of low specific capacity and poor rate performance restricting the development of lithium-ion batteries, and achieve high porosity, less demand for raw materials and equipment types, and large specific surface area Effect

Active Publication Date: 2019-09-06
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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  • Fabrication method and application of one-dimensional MOF@ZIF core-shell structure
  • Fabrication method and application of one-dimensional MOF@ZIF core-shell structure
  • Fabrication method and application of 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 powder.

[0045] (1) Dissolve 0.43g of 1,3,5- trimesic acid in 90ml of deionized water to form solution A 1 , dissolve 0.50g of cobalt acetate tetrahydrate in 10ml of deionized water to form solution B 1 , solution A 1 When preheated to 85°C in a water bath, add solution B 1 After adding, stirring and reacting at a constant temperature for 15 minutes, the product was centrifuged, washed with ethanol, and dried 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 , dissolve 0.053g cobalt acetate tetrahydrate and 0.42g zinc acetate dihydrate in 10ml deionized water to form solution B 2 , solution A 2 When preheated to 100°C in an oil bath, add solution B to 2After adding, stirring and reacting at a constant temperature for 1 min, the product was centrifuged, washed with ethanol, and dried in an oven at 80° C. to obtai...

Embodiment 2

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

[0050] (1) Disperse 80mg Co-BTC powder in 90ml 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 Placed in a water bath and preheated to 25°C, the C 1 The solution was added to 2-methylimidazole solution D 1 The reaction was stirred at a 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 images and TEM images of the Co-BTC@ZIF powder prepared in this example are shown in the FESEM images. The FESEM images show that the surface of the originally smooth micro-wires has become rough, and the TEM images show a core-shell structure. Figure 5 From the XRD pattern of the Co-BTC@ZIF powder prepared in this example, it can be seen th...

Embodiment 3

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

[0054] (1) Disperse 80mg Zn / Co-BTC powder in 30ml 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 solution D 2 , the C 2 Placed in a water bath and preheated to 45°C, the C 2 The solution was added to 2-methylimidazole solution D 2 The reaction was 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 images and TEM images of the Zn / Co-BTC@ZIF powder prepared in this example. The FESEM image showed that the surface of the originally smooth nanowires became rough, and the TEM image showed a core-shell structure. Image 6 From the XRD pattern of the Zn / Co-BTC@ZIF powder prepared in this example, it can be seen that the Zn / Co-BTC diffracti...

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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 in particular relates to a general method for preparing MOF@ZIF core-shell structures with different one-dimensional MOFs materials as precursors, and using the derived porous carbon@nitrogen-doped porous carbon for high performance Anode material 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 development of lithium-ion batteries is restricted due to the low specific capacity (372 mAh / g) and poor rate performance of conventional commercial graphite anodes. 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 exce...

Claims

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Application Information

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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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