Preparation method and use of MnO@ nitrogen-doped porous carbon nanocomposite

A technology of nitrogen-doped porous carbon and nanocomposites, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to increase electrochemical lithium storage performance, high specific surface area, fast and simple preparation method Effect

Inactive Publication Date: 2019-05-31
HEFEI UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current research at home and abroad still has not completely solved the above problems.

Method used

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  • Preparation method and use of MnO@ nitrogen-doped porous carbon nanocomposite
  • Preparation method and use of MnO@ nitrogen-doped porous carbon nanocomposite
  • Preparation method and use of MnO@ nitrogen-doped porous carbon nanocomposite

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Embodiment 1

[0031] Embodiment 1, the preparation method of MnO@nitrogen-doped porous carbon nanocomposite, comprises the following steps:

[0032] (1) Dissolve 0.428g of trimesic acid into 50ml of 80°C deionized water, keep the water bath at constant temperature for a period of time, wait for it to completely dissolve, dissolve 0.495g of manganese acetate into 50ml of 80°C deionized water, pour the manganese acetate solution into In the trimesic acid solution, stir and react at a constant temperature for 30 minutes to obtain a metal-organic framework precursor, namely Mn-BTC powder;

[0033] (2) Dry the Mn-BTC powder obtained above in a constant temperature drying oven, and the temperature of the constant temperature drying oven is 80 ° C;

[0034] (3) Calcining the metal-organic framework precursor obtained in (1) in an ammonia atmosphere, the calcination temperature is 800°C, the holding time is 2 hours, and the heating rate is 2°C / min, and MnO@nitrogen-doped porous carbon can be obtain...

Embodiment 2

[0035] Embodiment 2, the preparation of MnO@porous carbon nanocomposite

[0036] The metal-organic framework precursor obtained in (1) of Example 1 was calcined in an argon atmosphere, the calcination temperature was 800°C, the holding time was 2 hours, and the heating rate was 2°C / min, to obtain MnO@porous carbon nanocomposite thing;

[0037] figure 1 with figure 2 The SEM and TEM photos of the MnO@nitrogen-doped porous carbon nanocomposite obtained in Example 2 above show that the diameter of the material is between 200-400 nm.

[0038] image 3 with Figure 4 The SEM and TEM photos of the MnO@porous carbon nanocomposite obtained in Example 2 show that the material is a solid nanowire with a porous structure.

[0039] Figure 5 It is the EDS image of the sample obtained in Example 1. It can be seen that after the metal-organic framework precursor is calcined in an ammonia atmosphere, the product contains a large amount of nitrogen, and the doping of nitrogen is conduc...

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Abstract

The invention discloses a method for preparing a MnO@ nitrogen-doped porous carbon nanocomposite, comprising the steps of dissolving trimesic acid in deionized water at 80 degrees centigrade; maintaining a constant temperature in a water bath for a period of time; then dissolving manganese acetate in the deionized water; pouring a manganese acetate solution into a trimesic acid solution and stirring the two solutions at a constant temperature; after a constant-temperature reaction for a period of time, washing and centrifuging the reaction product to obtain a metal-organic framework, namely Mn-BTC powder; drying the Mn-BTC powder in a constant-temperature drying oven; and calcining the Mn-BTC powder in an ammonia atmosphere to obtain the MnO@ nitrogen-doped porous carbon nanocomposite. TheMnO@ nitrogen-doped porous carbon nanocomposite exhibits excellent electrochemical performance in lithium ion storage, and the porous carbon can alleviate the volume expansion of manganese oxide in alithiation process.

Description

technical field [0001] The invention relates to the field of nanocomposite materials, in particular to a method for preparing MnO@nitrogen-doped porous carbon nanocomposites by using metal-organic frameworks as precursors and calcining them in an ammonia atmosphere and applying them to high performance Anode materials for lithium-ion batteries. Background technique [0002] Lithium-ion batteries have large capacity, high working voltage, low self-discharge, high safety, long cycle life, no memory effect, small size, light weight, high specific energy, and do not contain heavy metal harmful substances such as cadmium, lead, and mercury , so there will be no such environmental pollution. In recent years, the rapid development of portable electronic devices, electric tools and electric vehicles has put forward higher requirements on the performance of lithium-ion batteries, which has stimulated the research of a new generation of lithium-ion battery anode materials with high s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 朱燕舞李雪原崔接武王岩余东波吴玉程
Owner HEFEI UNIV OF TECH
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