Graphene curled molybdenum trioxide nano-ribbons, and preparation method and application thereof

A technology of molybdenum trioxide and graphene, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of low conductivity, capacity loss, poor kinetic performance, etc., and achieve the effect of high specific capacity, simple process and excellent rate

Active Publication Date: 2013-11-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, molybdenum trioxide has some disadvantages, such as poor kinetic performance or capacity loss during cycling (especially at higher rates), low conductivity, etc.

Method used

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  • Graphene curled molybdenum trioxide nano-ribbons, and preparation method and application thereof
  • Graphene curled molybdenum trioxide nano-ribbons, and preparation method and application thereof
  • Graphene curled molybdenum trioxide nano-ribbons, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] One-step hydrothermal preparation of graphene curled molybdenum trioxide nanoribbon battery cathode material, comprising the following steps:

[0030] 1) Preparation of molybdenum sol: Measure 40mL of hydrogen peroxide solution into a 100mL beaker, slowly add 4g of molybdenum powder into hydrogen peroxide, and the whole process is carried out in a cold water bath. After the molybdenum powder is added completely, stir in a cold water bath for 4 hours;

[0031] 2) Measure 5mL of the graphene dispersion prepared by the Hummer method and 30mL of the molybdenum sol prepared in step 1), stir in a 70°C water bath for 4h, transfer to a 50mL reaction kettle, keep it in a constant temperature box at 180°C for 6h, and then naturally Cool to room temperature;

[0032] 3) The product obtained in step 2) was washed with absolute ethanol for 3-4 times, and then dried in an oven at 80°C to obtain graphene curled molybdenum trioxide nanobelts.

[0033] Such as figure 1 As shown, XRD ...

Embodiment 2

[0041] One-step hydrothermal preparation of graphene curled molybdenum trioxide nanoribbon battery cathode material, comprising the following steps:

[0042] 1) Preparation of molybdenum sol: Measure 40mL of hydrogen peroxide solution into a 100mL beaker, slowly add 4g of molybdenum powder into hydrogen peroxide, and the whole process is carried out in a cold water bath. After the molybdenum powder is added completely, stir in a cold water bath for 4 hours;

[0043] 2) Measure 5mL of the graphene dispersion prepared by the Hummer method and 30mL of the molybdenum sol prepared in step 1), stir in a 70°C water bath for 4h, transfer to a 50mL reactor, and keep it in a constant temperature box at 170°C for 6h, then Natural cooling to room temperature;

[0044] 3) The product obtained in step 2) was washed with absolute ethanol for 3-4 times, and then dried in an oven at 80°C to obtain graphene curled molybdenum trioxide nanobelts.

[0045]The graphene crimped molybdenum trioxide...

Embodiment 3

[0047] One-step hydrothermal preparation of graphene curled molybdenum trioxide nanoribbon battery cathode material, comprising the following steps:

[0048] 1) Preparation of molybdenum sol: Measure 40mL of hydrogen peroxide solution into a 100mL beaker, slowly add 4g of molybdenum powder into hydrogen peroxide, and the whole process is carried out in a cold water bath. After the molybdenum powder is added completely, stir in a cold water bath for 4 hours;

[0049] 2) Measure 5mL of the graphene dispersion prepared by the Hummer method and 30mL of the molybdenum sol prepared in step 1), stir in a water bath at 80°C for 4h, transfer to a 50mL reaction kettle, and keep it in an incubator at 190°C for 6h, then Natural cooling to room temperature;

[0050] 3) The product obtained in step 2) was washed with absolute ethanol for 3-4 times, and then dried in an oven at 80°C to obtain graphene curled molybdenum trioxide nanobelts.

[0051] The graphene crimped molybdenum trioxide n...

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Abstract

The invention relates to graphene curled molybdenum trioxide nano-ribbons, and a preparation method and an application thereof. The nano-ribbons can be used as a lithium ion battery positive electrode material. The method comprises the steps that: (1) a molybdenum sol is prepared, wherein excessive hydrogen peroxide solution is weighed and placed into a beaker; molybdenum powder is slowly added into the hydrogen peroxide, wherein the entire process is carried out under a cold water bath; when the molybdenum powder is completely added, the materials are stirred, such that molybdenum sol is obtained; (2) a graphene dispersion prepared with a Hummer method and the molybdenum sol prepared in the step (1) are weighed and are stirred under water bath; the mixture is transferred to a reaction kettle, and is subjected to a hydrothermal reaction in a thermostat; the material is naturally cooled to room temperature; (3) the product obtained in the step (2) is washed by using anhydrous ethanol, and is dried in a drying oven. The nano-ribbons and the method have the advantages that: when the material is adopted as a lithium ion battery positive electrode material, excellent rate performance, high specific capacity, and good circulation stability are shown. The process is simple and economical.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a graphene curled molybdenum trioxide nanobelt and a preparation method thereof, which can be used as a positive electrode material of a lithium ion battery. Background technique [0002] With the increasing demand for energy, finding new energy storage systems to overcome traditional fuel storage has become a challenge today. Rechargeable lithium batteries have been the focus of much research due to their low price, long cycle life, high energy density, and favorable reversibility characteristics. [0003] Among transition metal oxides, molybdenum trioxide, as a key material, has been intensively studied in the fields of optics, field emission, catalysis, and sensors. Especially in the application of electrochemical energy storage, because of its stability, high capacity and good rate performance, it can be widely used and researched. Mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/583B82Y30/00B82Y40/00
CPCY02E60/12Y02E60/10
Inventor 麦立强董轶凡李硕
Owner WUHAN UNIV OF TECH
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