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Sr/ graphene composite material and preparation method and application thereof

A composite material and graphene technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of low capacitance and energy density, and achieve long cycle life, good electrochemical performance, and high specific capacitance Effect

Inactive Publication Date: 2017-07-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The electrode material is the most important factor determining the performance of supercapacitors. The current commercial supercapacitors are mainly carbon materials with high specific surface area. This material mainly stores electric energy based on the principle of electric double layer and has a very high cycle life. However, the capacitance The energy density is relatively low, and there is still a certain distance from the requirements of practical applications

Method used

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  • Sr/ graphene composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) After mixing graphene and strontium hydroxide solid powder with a mass ratio of 15:1, grind for 1 h with a grinder at a rate of 800 r / min; after the grinding is completed, add 50 ml of deionized water and stir for 0.5 h with a stirrer Finally, put it into a hydrothermal reaction kettle and bake it at 300°C for 12 hours. After the reaction is over, wash and dry it for later use;

[0028] (2) After cleaning the nickel foam sheet with absolute ethanol, deionized water, HCl solution, after cleaning the nickel foam sheet with deionized water, it is for subsequent use;

[0029] (3) take by weighing the strontium / graphene composite material that 1.580g step (1) obtains with electronic balance;

[0030] (4) take by weighing 0.197g conductive polymer and the binder of equal quality with electronic balance;

[0031] (5) After mixing the three substances obtained in step (3) and step (4), add absolute ethanol, stir with a mixer for 0.5h, make it mix evenly, and set aside;

...

Embodiment 2

[0038] (1) After mixing graphene and strontium hydroxide solid powder with a mass ratio of 10:1, use a grinder to grind for 2 hours at a rate of 800r / min. After the grinding is completed, add 50ml of deionized water and stir with a mixer for 1 hour , put it into a hydrothermal reaction kettle, and bake it at 100°C for 24 hours. After the reaction is over, wash and dry it for later use;

[0039] (2) After cleaning the nickel foam sheet with absolute ethanol, deionized water, HCl solution, after cleaning the nickel foam sheet with deionized water, it is for subsequent use;

[0040] (3) take by weighing the strontium / graphene composite material that 2.550g step (1) obtains with electronic balance;

[0041] (4) take by weighing 0.637g conductive polymer and the binder of equal quality with electronic balance;

[0042] (5) After mixing the three substances obtained in step (3) and step (4), add absolute ethanol, stir with a mixer for 1 hour, make it mix evenly, and set aside;

[...

Embodiment 3

[0048] (1) After mixing graphene and strontium hydroxide solid powder with a mass ratio of 12:1, grind for 0.5h with a grinder at a rate of 1000r / min, after the grinding is completed, add 55ml of deionized water and stir with a stirrer After 1 hour, put it into a hydrothermal reaction kettle and bake it at 100°C for 24 hours. After the reaction is over, wash and dry it for later use;

[0049] (2) After cleaning the nickel foam sheet with absolute ethanol, deionized water, HCl solution, after cleaning the nickel foam sheet with deionized water, it is for subsequent use;

[0050] (3) take by weighing the strontium / graphene composite material that 2.048g step (1) obtains with electronic balance;

[0051] (4) take by weighing 0.409g conductive polymer and the binder of equal quality with electronic balance;

[0052] (5) After mixing the three substances obtained in step (3) and step (4), add absolute ethanol, stir with a mixer for 1 hour, make it mix evenly, and set aside;

[00...

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Abstract

The invention provides a strontium / graphene composite material, which comprises a strontium compound and graphene, the strontium compound being selected from strontium hydroxide or strontium sulfide. The strontium / graphene composite material prepared through a hydrothermal method serves as an electrode material of a supercapacitor, and such material not only has good electrochemical performance, but also has higher specific capacitance and longer cycle life. The experiment result shows that the specific capacitance of the supercapacitor electrode material made from the strontium / graphene composite material prepared through the hydrothermal method can reach 10-1500F / g, and after constant-current charging and discharging for 3000 times, the specific capacitance thereof can still remain more than 98.5%.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a Sr / graphene composite material, its preparation method and its application. Background technique [0002] With the rapid development of the economy, problems such as energy shortage and environmental pollution have also emerged. Electrochemical supercapacitors, referred to as supercapacitors, have broad application prospects in power systems as a new type of energy storage device. As a new energy storage component, supercapacitors have the advantages of high energy density of batteries and high power density of electrolytic capacitors, long cycle life, high energy storage efficiency, fast charge and discharge speed, good high and low temperature performance, and environmental friendliness, with excellent energy storage potential. . [0003] The electrode material is the most important factor determining the performance of supercapacitors. The current comme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/32H01G11/30H01G11/86
CPCH01G11/30H01G11/32H01G11/86Y02E60/13
Inventor 韩颖慧刘云鹏宋利黎
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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