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A kind of preparation method of flexible electrode material

A flexible electrode and constant current technology, which is applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve the problems of flexibility of composite materials and manganese dioxide compounding without mentioning, and achieve good reproducibility , good discharge performance and large specific surface area

Inactive Publication Date: 2017-08-29
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology

Patent Publication No. CN 102568847 A uses electrodeposition to deposit manganese dioxide on the surface of graphene to prepare manganese dioxide / graphene composite materials for supercapacitors, but does not mention the flexibility of composite materials
Patent Publication No. CN 103762096A discusses the application of positive and negative pulse electrical signals at both ends of the graphene oxide solution to prepare flexible electrode material graphene paper, but does not mention the problem of compounding with manganese dioxide

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  • A kind of preparation method of flexible electrode material
  • A kind of preparation method of flexible electrode material
  • A kind of preparation method of flexible electrode material

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preparation example Construction

[0028] A preparation method of flexible electrode material includes the following steps:

[0029] 1) Graphene film is used as electrode material, graphene and manganese salt aqueous solution is used as electrolyte, sulfuric acid is used to adjust electrolyte acidity, electrochemical deposition is adopted by galvanostatic method, and manganese dioxide and graphene are deposited on the surface of graphene film. Composite materials.

[0030] 2) The electrochemically deposited material is calcined at 300-380℃ for 1-24h, and the flexible electrode material can be obtained after calcining.

[0031] Preferably, the concentration of graphene in the electrolyte is 0.1-100 mg / ml, the concentration of sulfuric acid is 0.2-1.0 mol / L, and the concentration of manganese salt is 0.15-1.5 mol / L.

[0032] More preferably, the concentration of graphene in the electrolyte is 1-10 mg / ml, the concentration of sulfuric acid is 0.2-0.5 mol / L, and the concentration of manganese salt is 0.6-1.0 mol / L.

[0033]...

Embodiment 1

[0042] Take graphene and 100mL deionized water into a 250mL beaker, use ultrasonic and mechanical stirring to disperse for 4h, the dispersion power is 500W, and then add sulfuric acid and manganese sulfate to make 1mg / mL graphene, 0.3M sulfuric acid and 0.8M manganese sulfate solution As an electrolyte, graphene film is used as the electrode material, and electrochemical deposition is performed at a high temperature of 95°C by the constant current method, and the deposition current is 2mA / cm 2 , The deposition time is 2880s; the electrodeposited material is put into a muffle furnace and calcined at 380°C for 24h. During the calcining process, argon gas is introduced for protection, and convection is formed by blasting. After calcination, a manganese dioxide / graphene composite flexible electrode material can be obtained. The thickness of the prepared flexible electrode material is 0.1mm-0.5mm, and the mass percentage of manganese dioxide is 60%-80%.

[0043] The manganese dioxide / ...

Embodiment 2

[0049] Take graphene and 100mL deionized water into a 250mL beaker, use ultrasonic and mechanical stirring to disperse for 4h, the dispersion power is 500W, and then add sulfuric acid and manganese sulfate to make 1mg / mL graphene, 0.3M sulfuric acid and 0.8M manganese sulfate solution As the electrolyte, graphene film is used as the electrode material, and the electrochemical deposition is carried out by the constant current method at a high temperature of 95℃, and the deposition current is 2mA / cm 2 , The deposition time is 2880s; put the electrodeposited material in a muffle furnace, calcined at 300 ℃ for 24h, pass argon gas for protection during the calcining process, and use blast to form convection. After calcination, the manganese dioxide / graphene composite flexible electrode material can be obtained, and the discharge curve is shown in Image 6 .

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Abstract

The invention discloses a preparation method of a flexible electrode material. In this method, graphene is used as an electrode material, an aqueous solution of graphene and manganese salt is used as an electrolyte, sulfuric acid is used to adjust the acidity of the electrolyte, and electrochemical deposition is used to load a composite material of manganese dioxide and graphene on the surface of the graphene film. By adjusting the electrolyte concentration, current, temperature and time during the electrodeposition process, the particle size, distribution density and specific surface area of ​​manganese dioxide graphene composites can be precisely controlled, and bendable manganese dioxide with good mechanical properties can be prepared. Manganese / graphene composite electrode materials. This manganese dioxide / graphene composite electrode material not only has good electrochemical performance after high-temperature calcination, but also has good flexibility and can be bent, suitable for making batteries with flexible structures, and does not require binders and conductive additives And the current collector can be directly made into the electrode, which saves the complicated coating process and the process is simple.

Description

Technical field [0001] The invention belongs to the field of electrode materials, and relates to a preparation method of a flexible electrode material, in particular to a preparation method of a manganese dioxide / graphene flexible electrode material. Background technique [0002] In recent years, with the vigorous development of electronic products, flexible energy storage devices have gradually been applied to foldable devices, wearable sensors, and implantable medical devices due to their thin thickness, light weight, good flexibility, and stretchability. Wait. Generally, copper foil and aluminum foil are mostly used as current collectors in batteries. The active material coated on the copper foil or aluminum foil is easily separated from the current collector when bent, so these materials cannot be used in flexible batteries. Unlike traditional batteries, flexible batteries require that the positive electrode, negative electrode, separator, and electrolyte of the battery must...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/50H01M4/66
CPCH01M4/50H01M4/583Y02E60/10
Inventor 袁中直刘亚柳
Owner SOUTH CHINA NORMAL UNIVERSITY
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