In-situ preparation of graphene composite electrode materials by ultrasonic chemical method

A graphene composite and electrode material technology, applied in the directions of hybrid capacitor electrodes, battery electrodes, electrochemical generators, etc., can solve the problems of reduced dispersibility, complicated procedures, affected performance, etc., and achieves low production cost, simple method and process, The effect of improving efficiency

Active Publication Date: 2018-12-25
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of ex-situ physical blending is simple, but carbon-based materials usually agglomerate irreversibly to form large agglomerates, resulting in reduced dispersion of carbon-based materials in solvents and affecting performance
In-situ chemical oxidative polymerization and electrochemical polymerization are complicated, or require special conductive substrates, and the yield is low

Method used

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  • In-situ preparation of graphene composite electrode materials by ultrasonic chemical method
  • In-situ preparation of graphene composite electrode materials by ultrasonic chemical method
  • In-situ preparation of graphene composite electrode materials by ultrasonic chemical method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment one, graphene / Co is prepared in situ by ultrasonic chemistry 3 o 4 Composite electrode material.

[0038] Preparation:

[0039] ① Weigh 50 mg of artificial graphite, add it to 100 mL of water, and ultrasonically treat it in a water bath for 30 minutes to prepare a 0.5 mg / mL graphite dispersion.

[0040] ②Add 2.4mmol Co(CH 3 COO) 2 4H 2 O was added to the above-mentioned graphite dispersion liquid, using a probe-type ultrasonic machine, set the temperature at 50°C, the power was 600W, and the ultrasonic time was 1h.

[0041] ③Slowly add 400mg (NH 4 ) 2 S 2 o 8 aqueous solution, continue to sonicate for 2h.

[0042] ④ The obtained product was repeatedly suction-filtered and washed with water and ethanol until the filtrate was neutral, and finally dried in a vacuum oven at 60°C for 12 hours to obtain the product graphene / Co 3 o 4 Composite electrode material.

[0043] ⑤ Put the product in a tube furnace, raise the temperature to 300° C. for ...

Embodiment 2

[0049] In this embodiment two, graphene / SnO is prepared in situ by ultrasonic chemistry 2 Composite electrode material.

[0050] Preparation:

[0051] ① Weigh 100 mg of graphite oxide and add it to 100 mL of water / ethanol mixed solvent (V H2O :V EtOH =1:3), sonicate for 30min to disperse the solution evenly, and make 100mL 1mg / mL graphite dispersion.

[0052] ② 1.34mmol anhydrous SnCl 2 Add it into the above-mentioned graphite dispersion liquid, use an ultrasonic cleaning machine, set the temperature at 50°C, the power at 300W, and the ultrasonic time for 2 hours to carry out the ultrasonic chemical reaction.

[0053] ③ The obtained product was repeatedly centrifuged and washed with water and ethanol until the solution was neutral, and finally dried in a vacuum oven at 60°C for 12 hours to obtain the product graphene / SnO 2 Composite electrode material.

[0054] ④ Place the product in a tube furnace, raise the temperature to 220° C. for 6 hours at a rate of 5° C. / min in a...

Embodiment 3

[0059] In this embodiment three, graphene / MnO is prepared in situ by ultrasonic chemistry 2 Composite electrode material.

[0060] Preparation:

[0061] Weigh natural graphite to make 100mL 1mg / mL graphite dispersion, and ultrasonically treat it for 30min to make the solution evenly dispersed.

[0062] ①Add 4.8mmol MnSO 4 Add it to the above graphite dispersion, use a probe-type ultrasonic machine, set the temperature at 50°C, power at 600W, and ultrasonic time for 30 minutes.

[0063] ②Add 10mL KMnO containing 3.2mmol 4 Aqueous solution, continue ultrasonic reaction 2h.

[0064] ③ The obtained product was repeatedly centrifuged with water and ethanol, washed by dialysis until the solution was neutral, and finally dried in a vacuum oven at 60°C for 12 hours to obtain the product graphene / MnO 2 Composite electrode material.

[0065] ④ Place the product in a tube furnace, raise the temperature to 500° C. for 4 hours at a heating rate of 10° C. / min in an air atmosphere, and...

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Abstract

The invention provides an in-situ preparation of graphene composite electrode materials by a ultrasonic chemical method. Graphene composite electrode materials with high specific capacitance, fast charge / discharge rate and good cycle stability can be obtained by effectively peeling graphite into graphene through a simple ultrasonic chemical reaction process and generating metal oxides and conductive polymer on the surface of graphene in situ. The method comprises the following steps in particular: adding graphite, metal salt or conductive polymer monomer and auxiliary agents into a solvent tocarry out ultrasonic chemical reaction, wherein the ultrasonic frequency is 20 kHz to 10 MHz, the ultrasonic power is 150 to 1000 W, and the reaction time is more than 1 hour; then performing washingand drying to obtain the graphene composite electrode material, wherein the prepared graphene composite electrode material is graphene / metal oxide composite electrode material, or graphene / conductivepolymer composite material, or graphene / metal oxide / conductive polymer composite material.

Description

technical field [0001] The invention belongs to the field of electrode material preparation, and in particular relates to the in-situ preparation of graphene composite electrode materials by a sonochemical method. technical background [0002] With the continuous development of modern science and technology, the problem of energy crisis has become increasingly prominent. It is imperative to develop new energy storage technologies, among which the development of electrochemical energy storage devices is particularly important. Supercapacitors and lithium-ion batteries gradually stand out due to their excellent electrochemical performance and environmental friendliness. Electrochemical energy storage materials are the key to realize the maximum storage, efficient conversion and rational application of energy storage devices, and are the basis and core of the development of new energy technologies. [0003] Electrochemical energy storage materials are mainly divided into elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/36H01G11/46H01G11/48H01M4/36H01M4/48H01M4/50H01M4/52H01M4/62H01M10/0525
CPCH01G11/24H01G11/36H01G11/46H01G11/48H01G11/86H01M4/366H01M4/48H01M4/50H01M4/52H01M4/625H01M10/0525Y02E60/10
Inventor 杨应奎何承恩李冉章庆
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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