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Preparation method of MnO2 nanoclusters by using graphene as template

A nanocluster, graphene technology, applied in nanostructure manufacturing, nanotechnology, nanotechnology and other directions, can solve the problems affecting the excellent performance of nanometer effect, large capacity loss, easy to occur agglomeration, etc., achieve excellent electrochemical performance, inhibit Reunion problems, the effect of convenient post-processing

Active Publication Date: 2011-08-10
TECH TRANSFER CENT CO LTD NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

However, the MnO2 nanomaterials prepared by the prior art are easy to agglomerate during the application process, and may form a passive film, so that it shows a large capacity loss in the first charge / discharge cycle, which seriously affects the capacity due to the nano-effect. excellent performance

Method used

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  • Preparation method of MnO2 nanoclusters by using graphene as template
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  • Preparation method of MnO2 nanoclusters by using graphene as template

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preparation example Construction

[0018] As shown in the accompanying drawing, graphene of the present invention is template MnO 2 A method for preparing nanoclusters, comprising the following steps:

[0019] Step 1: disperse natural graphite in N-methylpyrrolidone, and then perform ultrasonic treatment;

[0020] Step 2: Centrifuge the mixture obtained in step 1, discard the residual solid at the bottom, and take the mixed solution in the upper layer (ie, the suspension formed by dispersing the raw material graphene in N-methylpyrrolidone);

[0021] Step 3: Incorporate the KMnO 4 Dissolve in water to form KMnO 4 aqueous solution;

[0022] Step 4: KMnO prepared in step 3 4 Add the aqueous solution to the mixed solution prepared in step 2, stir and react for a period of time to obtain a new mixed solution, and the reaction equation is:

[0023] 4KMnO 4 +3C+H 2 O→4MnO 2 +K 2 CO 3 +2KHCO 3 ;

[0024] Step 5: centrifuge, wash, dry and grind the new mixed solution prepared in step 4 to obtain the require...

Embodiment 1

[0028] Step 1: Disperse 10mg of natural graphite in 100mL of N-methylpyrrolidone, and then perform ultrasonic treatment for 10min;

[0029] Step 2: Centrifuge the mixture obtained in step 1 at a low speed (100rpm), discard the residual solid at the bottom, and get the upper layer of the mixed solution (that is, the suspension formed by dispersing the raw material graphene in N-methylpyrrolidone);

[0030] Step 3: Add 40mg of KMnO 4 Dissolve in water to form KMnO 4 aqueous solution;

[0031] Step 4: KMnO prepared in step 3 4 The aqueous solution was added to the mixed solution prepared in step 2, stirred and reacted for 54 hours at 25° C. to obtain a new mixed solution, and the reaction equation was:

[0032] 4KMnO 4 +3C+H 2 O→4MnO 2 +K 2 CO 3 +2KHCO 3 ;

[0033] Step 5: Centrifuge, wash, dry and grind the new mixed solution prepared in step 4 to obtain the required MnO 2 nanoclusters. The transmission electron microscope image of the raw material graphene is as fol...

Embodiment 2

[0035] Step 1: Disperse 1mg of natural graphite in 100mL of N-methylpyrrolidone, and then perform ultrasonic treatment for 30min;

[0036] Step 2: The mixture obtained in step 1 is subjected to low-speed centrifugation (500rpm), the residual solid at the bottom is discarded, and the upper layer of the mixed solution (that is, the suspension formed by dispersing the raw material graphene in N-methylpyrrolidone);

[0037] Step 3: Add 5 mg of KMnO 4 Dissolve in 5mL water to form KMnO 4 aqueous solution;

[0038] Step 4: KMnO prepared in step 3 4 The aqueous solution was added to the mixed solution prepared in step 2, stirred and reacted for 72 hours at 5° C. to obtain a new mixed solution, and the reaction equation was:

[0039] 4KMnO 4 +3C+H 2O→4MnO 2 +K 2 CO 3 +2KHCO 3 ;

[0040] Step 5: Centrifuge, wash, dry and grind the new mixed solution prepared in step 4 to obtain the required MnO 2 nanoclusters. It was determined that the specific capacitance of the obtained ...

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Abstract

The invention relates to a preparation method of MnO2 nanoclusters by using graphene as a template. The method comprises the following steps: 1) dispersing natural graphite in N-methylpyrrolidone, and performing ultrasonic treatment; 2) centrifuging the mixture obtained in the step 1), discarding solid residues at the bottom, and taking the upper mixed liquor; 3) dissolving KMnO4 in water to forma KMnO4 solution; 4) adding the KMnO4 solution obtained in the step 3) in the mixed liquor obtained in the step 2), and stirring to react for a certain time and obtain new mixed liquor; and 5) centrifuging the new mixed liquor obtained in the step 4), washing, drying, and grinding to obtain the desired MnO2 nanoclusters. The preparation method is a soft chemical method which is simple in operation; and the MnO2 nanometer material with excellent electrochemical properties can be prepared under mild conditions.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for preparing MnO2 nanoclusters with graphene as a template. Background technique [0002] Supercapacitor is a new type of energy storage device whose performance is between that of battery and traditional capacitor. High, no pollution to the environment, long cycle life, wide operating temperature range, high safety and so on. In recent years, it has been widely used in the fields of mobile communication, information technology, aerospace and national defense technology, showing unprecedented application prospects. Especially in electric vehicles, supercapacitors and batteries jointly provide high power and high energy, which not only reduces the size of the power supply but also prolongs the battery life. [0003] Electrode materials are the most critical part of supercapacitors and the main factor determining their performance. Therefore, the development...

Claims

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Application Information

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IPC IPC(8): B82B3/00C01G45/02
Inventor 陈胜汪信朱俊武刘孝恒韩巧凤杨绪杰陆路德
Owner TECH TRANSFER CENT CO LTD NANJING UNIV OF SCI & TECH
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