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CoNi2S4/graphene composite material for supercapacitor and preparation method thereof

A technology of supercapacitors and composite materials, applied in hybrid capacitor electrodes, nanotechnology for materials and surface science, nanotechnology, etc. the effect of reunion

Inactive Publication Date: 2018-11-23
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite its excellent cycling stability and high conductivity, graphene has lower capacitance and lower energy density than pseudocapacitive materials

Method used

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  • CoNi2S4/graphene composite material for supercapacitor and preparation method thereof
  • CoNi2S4/graphene composite material for supercapacitor and preparation method thereof
  • CoNi2S4/graphene composite material for supercapacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Take Co(NO 3 ) 2 ·6H 2 O is 1mmol, Ni(NO 3 ) 2 ·6H 2 O is 3mmol, CH 3 CSNH 2 Dissolve 6mmol in 40ml ethanol.

[0025] 2) Dissolve the prepared 10mgGO in 20ml of ethanol and sonicate for 1.5h, then add the CoNi2S4 solution prepared in 1) and transfer it to a 100ml tetrafluoroethylene-lined reactor for reaction. The hydrothermal reaction time is 16h, and the hydrothermal temperature is 180°C.

[0026] 3) Wash several times with deionized water and freeze-dry at -70°C for 72 hours to obtain the composite material CoNi 2 S 4 / rGO-1;

[0027] 4) The composite material CoNiS 4Grind / rGO-1 finely, mix the composite material, acetylene black, and polytetrafluoroethylene at a mass ratio of 8:1:1, add a small amount of ethanol as a solvent, stir magnetically, bake until it becomes sticky, and apply an appropriate amount on the nickel foam 5) 3M KOH solution was used as the electrolyte, and a three-electrode system was selected to measure its electrochemical perform...

Embodiment 2

[0030] 1) Take Co(NO 3 ) 2 ·6H 2 O is 3mmol, Ni(NO 3 ) 2 ·6H 2 O is 5mmol, CH 3 CSNH 2 Dissolve 10mmol in 50ml ethanol.

[0031] 2) Dissolve 60mg of GO prepared in 40ml of ethanol and sonicate for 1.5h, and then the CoNi prepared in 1) 2 S 4 The solution was added and transferred to a 100ml tetrafluoroethylene-lined reactor for reaction. The hydrothermal reaction time was 16 hours, and the hydrothermal temperature was 180°C.

[0032] Description: the remaining 3) to 5) steps are the same as in Example 1, and will not be described in detail to obtain CoNi 2 S 4 / rGO-2 composites, and make electrodes for electrochemical performance testing.

[0033] Figure 4 , Figure 5 It is the CoNi prepared by Example 2 of the present invention 2 S 4 / A scanning electron microscope image of a graphene nanocomposite, which shows the composite as a flower. Image 6 It is the CoNi prepared by Example 2 of the present invention 2 S 4 / Chart-discharge cycle diagram of graphene ...

Embodiment 3

[0036] 1) Take Co(NO 3 ) 2 ·6H 2 O is 3mmol, Ni(NO 3 ) 2 ·6H 2 O is 5mmol, CH 3 CSNH 2 Dissolve 10mmol in 50ml ethanol.

[0037] 2) Dissolve 80mg of GO prepared in 40ml of ethanol and sonicate for 1.5h, and then the CoNi prepared in 1) 2 S 4 The solution was added and transferred to a 100ml tetrafluoroethylene-lined reactor for reaction. The hydrothermal reaction time was 16 hours, and the hydrothermal temperature was 180°C.

[0038] Description: the remaining 3) to 5) steps are the same as in Example 1, and will not be described in detail to obtain CoNi 2 S 4 / rGO-3 composites, and make electrodes for electrochemical performance testing.

[0039] Through the electrochemical performance test, the charge and discharge test is carried out under constant current, from figure 1 Available in, Example 3 at 0.5A·g -1 Under the current density, the specific capacitance is 1216F·g -1 . at 1A·g -1 Under the current density, the specific capacitance is 1133F·g -1 . at 2...

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Abstract

The invention discloses a CoNi2S4 / graphene composite material for a supercapacitor and a preparation method thereof. The preparation method comprises the following specific steps that Co(NO3)2.6H2O, Ni(NO3)2.6H2O and thioacetamide CH3CSNH2 are firstly mixed in ethyl alcohol, then graphene oxide GO is added to a ethanol solution for even ultrasonic dispersion, then the ethanol solution is transferred to a hydrothermal reactor for solvothermal reaction, filtration, washing, lyophilization are performed after the reaction is completed, and the CoNi2S4 / graphene composite material for the supercapacitor is obtained. The CoNi2S4 / graphene composite material is good in cycling stability, after circulation is performed for 5000 times, the capacity retention ratio is 87.4%, the maximum high-energy density is 39.56W h.kg<-1>, and the power density is 374.8W h.kg<-1>. By controlling the quality of graphene, the CoNi2S4 / graphene composite material for the supercapacitor and the preparation method thereof can prepare supercapacitor electrode materials, and has advantages of higher capacitance, better cycle performance, environmental protection and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of supercapacitor electrode materials, in particular, relates to a CoNi 2 S 4 / Graphene composite material and preparation method thereof. Background technique [0002] As a new type of energy storage device, supercapacitors have the advantages of high power density, fast charging and discharging, long cycle life, wide operating temperature range, and environmental protection compared with other energy storage devices. The charge transfer process between the electrode surface of carbon nanotubes (CNTs), graphene, activated carbon and electrolyte ions is mainly based on the electric double layer energy storage mechanism, carbon nanofibers and organic carbides. Compared with other carbonaceous materials, graphene has a unique structure, high electrical conductivity, high mechanical strength, high theoretical surface area, and good thermal stability. Ionic charges are easily tuned by electrost...

Claims

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Application Information

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IPC IPC(8): H01G11/30H01G11/36H01G11/24B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/24H01G11/30H01G11/36Y02E60/13
Inventor 卢德力常哲馨林静静韩生刘玥冉张小杰薛原魏巍常伟颜松姚璐连俊赵豆豆刘业萍解麦莹陈凤飞任析朦
Owner SHANGHAI INST OF TECH
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