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Preparation method of dual-oxide/graphene nanometer composite electrode material

A nanocomposite, double oxide technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology, etc., to achieve the effect of reducing current impedance, strong cycle stability, and increasing specific capacitance value

Active Publication Date: 2017-11-28
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although many cobalt tetroxide and graphene-based composite materials have been reported, it is still a great challenge to synthesize a new type of electrode material that can significantly increase the specific capacitance and cycle life.

Method used

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  • Preparation method of dual-oxide/graphene nanometer composite electrode material
  • Preparation method of dual-oxide/graphene nanometer composite electrode material
  • Preparation method of dual-oxide/graphene nanometer composite electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: the preparation of a kind of double oxide / graphene nanocomposite electrode material:

[0030] First, weigh 1.19 grams of cobalt chloride hexahydrate and 0.075 grams of aluminum nitrate nonahydrate and dissolve them in a small beaker containing 30 ml of distilled water, continue to add 4 ml of graphene (2.6 mg / ml), and after ultrasonic for 30 minutes, stir under magnetic force While stirring, continue to add 2 ml of ammonia water drop by drop, take out the magnet, transfer the mixed solution to a stainless steel autoclave with a volume of 50 ml containing a polytetrafluoroethylene liner, seal the autoclave, and place it at 180 Take it out after 12 hours in an oven at 100°C, cool it naturally to room temperature, and centrifuge at 8,000 rpm for 5 minutes to obtain a precipitate, wash with distilled water and ethanol three times, put the precipitate in a 60-degree oven, and place it for 12 Take it out after drying for 300 o C was calcined for 3 hours to obta...

Embodiment 2

[0035] Embodiment 2: the preparation of a kind of double oxide nanocomposite electrode material:

[0036] First weigh 1.19 grams of cobalt chloride hexahydrate and 0.075 grams of aluminum nitrate nonahydrate and dissolve them in a small beaker containing 30 ml of distilled water. After ultrasonication for 30 minutes, continue to add 2 ml of ammonia water drop by drop while stirring with a magnetic stirrer. , take out the magnet, transfer the mixed solution to a 50 ml stainless steel autoclave with a polytetrafluoroethylene liner, seal the autoclave, place it in an oven at 180 degrees Celsius, take it out after 12 hours, and naturally Cool to room temperature, centrifuge at 8,000 rpm for 5 minutes, wash with distilled water and ethanol three times each to obtain a precipitate, put the precipitate in a 60-degree oven, place it for 12 hours and take it out after drying, 300 o C was calcined for 3 hours to obtain the final product.

Embodiment 3

[0037] Embodiment 3: the preparation of a kind of oxide nano-electrode material:

[0038] First weigh 1.19 g of cobalt chloride hexahydrate and dissolve it in a small beaker containing 30 ml of distilled water. After ultrasonication for 30 minutes, while stirring with a magnetic stirrer, continue to add 2 ml of ammonia water drop by drop, take out the magnet, and mix The solution was transferred to a stainless steel autoclave with a polytetrafluoroethylene liner with a volume of 50 ml. The autoclave was sealed and placed in an oven at 180 degrees Celsius. After 12 hours, it was taken out, cooled naturally to room temperature, and heated at 8000 rpm. Speed ​​per minute, centrifuge for 5 minutes, wash with distilled water and ethanol three times each to obtain a precipitate, put the precipitate in a 60-degree oven, place it for 12 hours and take it out after drying, 300 o C was calcined for 3 hours to finally obtain the product.

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Abstract

The invention employs a hydrothermal and calcination combined method to prepare a dual-oxide / graphene nanometer composite electrode material. The material has excellent electrochemical and energy-storage performance, and belongs to the technical field of material preparation and energy storage. The method is characterized by comprising the steps of respectively weighing a certain amount of cobalt source precursor and an aluminum source precursor and weighing a certain volume of distilled water in a small beaker, continuously adding a certain volume of graphene aqueous dispersion liquid, performing ultrasound for 30 minutes, dropwise adding a certain volume of ammonia water during stirring on a magnetic agitator, taking out a magnet, transferring a mixed solution to a stainless steel high-pressure reaction kettle containing a polytetrafluoroethylene liner, sealing the high-pressure reaction kettle, placing the high-pressure reaction kettle in a baking oven with a certain temperature, taking out the high-pressure reaction kettle after 12 hours, naturally cooling to a room temperature, performing centrifugation to obtain a precipitant, respectively washing the precipitant with the distilled water and alcohol for three times, and performing calcination on the precipitant for 3 hours under 300 DEG C to finally obtain the product. By the method, a surfactant is not needed to be used, the material is synthesized by one step, is high in yield and simple in preparation process and is suitable for industrial production, the specific capacitance value of the composite material is 968F / g when scanning current density is 1 A / g, and the retention rate still reaches 85% or above after circulation for 1,000 times.

Description

technical field [0001] The invention belongs to the technical field of material preparation and energy storage, and in particular relates to the preparation of a double oxide / graphene nanocomposite electrode material by a method combining hydrothermal and calcination. The material has excellent electrochemical and energy storage properties. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, were developed in the 1980s. They are a new type of energy storage device between traditional capacitors and batteries. They have excellent charge and discharge performance and relatively large energy storage performance. Such as high power density, long cycle life, fast charging speed, and no pollution, it is a new type of energy storage device developed in recent years. Therefore, supercapacitors are being studied by more and more people all over the world. [0003] Cobalt tetroxide is an important transition metal oxide, which has potential applic...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30H01G11/46H01G11/36B82Y40/00
CPCY02E60/13H01G11/86B82Y40/00H01G11/30H01G11/36H01G11/46
Inventor 宋吉明秦攀牛和林毛昌杰陈京帅
Owner ANHUI UNIVERSITY
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