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Alpha-MnO2/graphene hollow nanometer tube and preparation method thereof

A hollow nano, graphene technology, applied in nanotechnology, electrical components, electrochemical generators, etc., can solve the problems of crystal structure deformation, low electronic conductivity, poor electrochemical performance, etc., to achieve increased contact area, large Specific surface area, the effect of improving electronic conductivity

Inactive Publication Date: 2016-11-16
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] ① Li + During the deintercalation process, MnO 2 Larger volume expansion occurs, and the crystal structure is deformed, which leads to rapid decline in capacity;
[0009] ②MnO 2 The intrinsic electronic conductivity (10 -5 ~10 -6 S / cm) is low, so the electrochemical performance is poor at high rates

Method used

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  • Alpha-MnO2/graphene hollow nanometer tube and preparation method thereof
  • Alpha-MnO2/graphene hollow nanometer tube and preparation method thereof
  • Alpha-MnO2/graphene hollow nanometer tube and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] α-MnO 2 The preparation method of / graphene hollow nanotube comprises the following steps:

[0036] Step 1: Add 0.01 g of graphene oxide into 10 mL of deionized water, and ultrasonically vibrate the solution for 2 h.

[0037] Step 2: Add 0.02 g of ascorbic acid into the solution obtained in Step 1, and mix well.

[0038] Step 3. Put the mixed solution obtained in Step 2 into a 95° C. water bath and keep the temperature constant for 6 hours to obtain a black precipitate.

[0039] Step 4: Wash the black precipitate with deionized water and then with ethanol for 3 times, and put it in an oven at 80°C to dry it for later use.

[0040] Step five, 30mL concentration is 0.067mol / L KMnO 4 The aqueous solution was mixed evenly with 2 mL of HCl with a concentration of 2 mol / L.

[0041] Step 6. Add the black precipitate obtained in step 4 to the mixed solution in step 5, stir evenly and transfer to a high-pressure reactor, and the solution volume is controlled at 60% of the rea...

Embodiment 2

[0044] α-MnO 2 The preparation method of / graphene hollow nanotube comprises the following steps:

[0045] Step 1: Add 0.015 g of graphene oxide into 15 mL of deionized water, and ultrasonically vibrate the solution for 2 h.

[0046] Step 2: Add 0.0375g of ascorbic acid into the solution obtained in Step 1, and mix well.

[0047] Step 3: Put the mixed solution obtained in Step 2 into a 90° C. water bath and keep the temperature constant for 8 hours to obtain a black precipitate.

[0048] Step 4: Wash the black precipitate with deionized water and then with ethanol for 3 times, and put it in an oven at 80°C to dry it for later use.

[0049] Step 5: 30 mL of KMnO with a concentration of 0.13 mol / L 4 The aqueous solution was mixed evenly with 3 mL of HCl with a concentration of 2 mol / L.

[0050] Step 6: Add the black precipitate obtained in step 4 to the mixed solution in step 5, stir evenly and then transfer to a high-pressure reactor, and the volume of the solution is contro...

Embodiment 3

[0053] α-MnO 2 The preparation method of / graphene hollow nanotube comprises the following steps:

[0054] Step 1: Add 0.005 g of graphene oxide into 10 mL of deionized water, and ultrasonically vibrate the solution for 2 h.

[0055] Step 2: Add 0.015 g of ascorbic acid into the solution obtained in Step 1, and mix well.

[0056] Step 3: Put the mixed solution obtained in Step 2 into a 93° C. water bath and keep the temperature constant for 7 hours to obtain a black precipitate.

[0057]Step 4: Wash the black precipitate with deionized water and then with ethanol for 3 times, and put it in an oven at 80°C to dry it for later use.

[0058] Step 5: 30 mL of KMnO with a concentration of 0.053 mol / L 4 The aqueous solution was mixed evenly with 2 mL of HCl with a concentration of 2 mol / L.

[0059] Step 6: Add the black precipitate obtained in step 4 to the mixed solution in step 5, stir evenly and then transfer to a high-pressure reactor, and the volume of the solution is contro...

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Abstract

The invention relates to the technical field of an electrode material and specifically relates to an alpha-MnO2 / graphene hollow nanometer tube and a preparation method thereof. The preparation method comprises the following steps of: adding graphene oxide into deionized water and then ultrasonically oscillating; adding ascorbic acid into the solution and mixing, thereby acquiring a first mixing solution; putting the first mixing solution into a water bath kettle and keeping constant temperature, thereby acquiring a black precipitate; washing black precipitate with deionized water and ethyl alcohol, drying and standing by; mixing a KMnO2 aqueous solution with HCl, thereby acquiring a second mixing solution; adding the black precipitate into the second mixing solution, stirring and then putting into a high pressure reaction kettle; and after reacting, cooling and washing the product with distilled water, washing with absolute ethyl alcohol, and lastly drying, thereby acquiring the alpha-MnO2 / graphene hollow nanometer tube. According to the invention, the alpha-MnO2 / graphene hollow nanometer tube is compounded according to a hydrothermal method. The diffusion length of lithium ions in the electrode material is shortened by the nanometer structure MnO2, so that the electrochemical reaction is accelerated.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to an α-MnO 2 / Graphene hollow nanotube and preparation method thereof. Background technique [0002] MnO 2 It is an important transition metal oxide. Due to its excellent electrochemical performance, it has been widely used in lithium-ion batteries, supercapacitors, zinc-manganese batteries, Li / MnO 2 Used as electrode active material in batteries such as batteries. Manganese dioxide has the following advantages as an anode material for lithium-ion batteries: [0003] (1) High theoretical specific capacity (1232mAh / g). This capacity is not only much higher than the theoretical specific capacity (372mAh / g) of current commercial carbon materials, but also better than that of many other transition metal oxides. Higher theoretical specific capacity will make it possible to develop high-capacity lithium battery anode materials; [0004] (2)MnO 2 With a lower discharge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M4/583H01M4/1391H01M4/1393H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/1391H01M4/1393H01M4/362H01M4/502H01M4/583H01M10/0525Y02E60/10
Inventor 夏傲刘宗怀
Owner SHAANXI NORMAL UNIV
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