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Method for preparing composite electrode material of super capacitor

A supercapacitor and composite electrode technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of low rate and unsatisfactory cycle life, and achieve the effects of low equipment use requirements, good cycle stability and simple operation process.

Inactive Publication Date: 2013-01-30
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the spherical flower-shaped cobalt oxide and the sandwich-structured spherical nickel hydroxide exhibit high specific capacitance when used as supercapacitor materials, due to their semiconducting properties, their rate is low at high current densities. At the same time, the cycle life of such materials is not ideal

Method used

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  • Method for preparing composite electrode material of super capacitor
  • Method for preparing composite electrode material of super capacitor
  • Method for preparing composite electrode material of super capacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Preparation of graphite oxide

[0032] Add 1.5g of graphite and 1.5g of NaNO to a 500ml beaker 3 , 70ml of H 2 SO 4 (98%), sonicated for 15 minutes, then transferred to an ice bath, and then slowly added 9g of KMnO 4 , magnetically stirred for 2 hours, the solution changed from black to brown, then added 100ml of deionized water, magnetically stirred evenly and then added 200ml of water, the solution changed from brown to yellowish brown, then transferred to a water bath at 90°C Stir at constant temperature for 1 hour, the solution turns yellow, when cooled to about 40°C, add 5ml of hydrogen peroxide (30%), then centrifuge several times with deionized water and ethanol, and vacuum freeze-dry the obtained sample for 24 hours to obtain oxidized graphite.

[0033] (2) Preparation of Ni(OH) 2 / CoO / rGO composite electrode material

[0034] Take 12 mg of the prepared graphite oxide and disperse it ultrasonically with 24 ml of ethylene glycol, and at the same time di...

Embodiment 2

[0042] (1) Preparation of graphite oxide

[0043] Add 1.5g of graphite and 1.5g of NaNO to a 500ml beaker 3 , 70ml of H 2 SO 4 (98%), sonicated for 15 minutes, then transferred to an ice bath, and then slowly added 6g of KMnO 4 , magnetically stirred for 1 hour, the solution changed from black to brown, then added 100ml of deionized water, magnetically stirred evenly and then added 200ml of water, the solution changed from brown to yellowish brown, then transferred to a water bath at 80°C Stir at constant temperature for 2 hours, the solution turns yellow, when cooled to about 10°C, add 5ml of hydrogen peroxide (30%), then centrifuge several times with deionized water and ethanol, and vacuum freeze-dry the obtained sample for 24 hours to obtain oxidized graphite.

[0044] (2) Preparation of Ni(OH) 2 / CoO / rGO composite electrode material

[0045] Take 12 mg of the prepared graphite oxide and disperse it ultrasonically with 24 ml of ethylene glycol, and at the same time disp...

Embodiment 3

[0049] (1) Preparation of graphite oxide

[0050] Add 1.5g of graphite and 1.5g of NaNO to a 500ml beaker 3 , 70ml of H 2 SO 4 (98%), sonicated for 15 minutes, then transferred to an ice bath, and then slowly added 18g of KMnO 4 , magnetically stirred for 3 hours, the solution changed from black to brown, then added 100ml of deionized water, magnetically stirred evenly and then added 200ml of water, the solution changed from brown to yellowish brown, then transferred to a water bath at 100°C Stir at constant temperature for 0.5 hours, the solution turns yellow, when cooled to about 20°C, add 5ml of hydrogen peroxide (30%), then centrifuge several times with deionized water and ethanol, and freeze-dry the obtained sample in vacuum for 12 hours to obtain oxidized graphite.

[0051] (2) Preparation of Ni(OH) 2 / CoO / rGO composite electrode material

[0052] Take 12 mg of the prepared graphite oxide and disperse it ultrasonically with 24 ml of ethylene glycol, and at the same...

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Abstract

The invention relates to a method for preparing a composite electrode material of a super capacitor. The method comprises the following steps of: (1) ultrasonically dispersing graphite, sodium nitrate and concentrated sulfuric acid into an ice bath, adding potassium hypermanganate, magnetically stirring, adding deionized water, magnetically stirring to make a mixture uniform, re-adding the deionized water, stirring at constant temperature, reacting in a water bath, cooling, adding hydrogen peroxide, centrifugally washing, freezing and drying in vacuum, and thus obtaining graphite oxide; (2) dispersing the graphite oxide, nickel salt and cobalt salt into a solvent, and performing solvothermal reaction to synthesize a Ni(OH)2 / CoO / rGO composite material; and (3) uniformly mixing a Ni(OH)2 / CoO reduction graphene oxide composite material, carbon black and polyvinylidene fluoride, stirring at room temperature, uniformly coating on the surface of nickel foam, drying in vacuum, and thus obtaining the composite electrode material of the super capacitor. The method is easy to operate and low in equipment using requirement. Raw materials are easily obtained, low in toxicity and low in cost. A novel method is provided for preparation of a nanosheet composite electrode material.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials, in particular to the preparation of a supercapacitor composite electrode material. Background technique [0002] With the continuous development of society, large-scale industrial production has reduced non-renewable energy mainly based on fossil fuels such as coal and oil; at the same time, the consumption of large amounts of fossil fuels has also brought serious environmental pollution problems. Therefore, human beings urgently need to reduce their dependence on it. In recent years, people have devoted themselves to seeking new energy devices that can replace internal combustion engines that mainly burn oil. Among them, the supercapacitor has the characteristics of short charging time, long service life, strong environmental adaptability, energy saving and no pollution to the environment. It is a new type of energy storage element between the traditional electrostatic supercap...

Claims

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Application Information

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IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 胡俊青蒋林邹儒佳刘倩李文尧薛雅芳彭彦玲胡向华吴凡
Owner DONGHUA UNIV
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