A kind of preparation method of double oxide/graphene nanocomposite 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 increasing specific capacitance, reducing current impedance, and high specific capacitance
CN107403700BActive Publication Date: 2018-12-21ANHUI UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI UNIVERSITY
Publication Date
2018-12-21

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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.
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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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