Preparation method and application of self-support flexible electrode

A flexible electrode, self-supporting technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of complex preparation process of conductive carbon nanomaterials, easy pulverization of flexible electrodes, etc., to achieve easy shape design and assembly, and environmental friendliness , excellent performance

Inactive Publication Date: 2017-11-24
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome existing SnO 2 Flexible electrodes are easy to pulverize, need to add conductive carbon nanomaterials and relatively complicated preparation process, and provide a carbon-coated SnO 2 Preparation method of flexible electrode composed of nanofibers

Method used

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  • Preparation method and application of self-support flexible electrode
  • Preparation method and application of self-support flexible electrode
  • Preparation method and application of self-support flexible electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Get 0.8 grams of tin dichloride (SnCl 2 2H 2 O) and 0.5 g of polyvinylpyrrolidone (PVP) were dissolved in a mixed solvent consisting of 5 g of dimethylformamide (DMF) and 5 g of ethanol to form a 'nuclear' solution; 0.5 g of polyacrylonitrile (PAN) was dissolved The 'shell' solution was prepared in 5 grams of dimethylformamide (DMF); the above two solutions were used as the 'core' and 'shell' solutions respectively for coaxial electrospinning, and the coaxial electrospinning voltage was 15kV. The collection distance is 15 cm. The collected film was heat-treated at 250°C for 2 hours under a high-purity nitrogen atmosphere, then raised to 650°C for 2 hours, and cooled to room temperature to obtain a black self-supporting flexible electrode. The self-supporting flexible electrode prepared by the invention can withstand repeated bending deformation and can be directly cut and processed. Its shape and flexibility are as figure 1 shown.

Embodiment 2

[0025] Take 1.0 g of tin dichloride (SnCl 2 2H 2 O) and 0.5 g of polyvinylpyrrolidone (PVP) were dissolved in a mixed solvent consisting of 5 g of dimethylformamide (DMF) and 5 g of ethanol to form a 'nuclear' solution; 0.5 g of polyacrylonitrile (PAN) was dissolved The 'shell' solution was prepared in 4.5 grams of dimethylformamide (DMF); the above two solutions were respectively used as the 'core' and 'shell' solutions for coaxial electrospinning, and the coaxial electrospinning voltage was 15kV. The collection distance is 15 cm. The collected film was heat-treated at 250°C for 2 hours in a high-purity nitrogen atmosphere, then raised to 700°C for 2 hours, and cooled to room temperature to obtain a black self-supporting flexible electrode.

Embodiment 3

[0027] Get 0.8 grams of tin dichloride (SnCl 2 2H 2 O) and 0.5 g of polyvinylpyrrolidone (PVP) were dissolved in a mixed solvent consisting of 5 g of dimethylformamide (DMF) and 5 g of ethanol to form a 'nuclear' solution; 0.5 g of polyacrylonitrile (PAN) was dissolved The 'shell' solution was prepared in 5 grams of dimethylformamide (DMF); the above two solutions were used as the 'core' and 'shell' solutions respectively for coaxial electrospinning, and the coaxial electrospinning voltage was 15kV. The collection distance is 15 cm. The collected film was heat-treated at 250°C for 2 hours under a high-purity nitrogen atmosphere, then raised to 650°C for 3 hours, and cooled to room temperature to obtain a black self-supporting flexible electrode. The self-supporting flexible electrode prepared by the present invention is completely composed of nanofibers, with a microstructure such as figure 2 shown. Inside the fiber are tin dioxide nanofibers, and the outer layer is a car...

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Abstract

The invention discloses a preparation method and an application of a self-support flexible electrode. The self-support flexible electrode has the advantages of environment friendliness, mild reaction condition, no conductive agent or binding agent addition, self-support film and excellent mechanical property. Compared with the existing SnO2 flexible electrode, the obtained flexible electrode comprises a carbon-clad nanofiber; a carbon-clad layer can protect an active material against corrosion of an electrolyte, and can inhibit structure collapse caused by volume expansion in charging and discharging processes; the flexible electrode is high in porosity; permeation of the electrolyte is facilitated; the flexible electrode can bear repeated bending without breaking; the electrochemical property basically remains constant; the flexible electrode can be directly cut for mounting a battery; and shape design and assembling of the battery are facilitated. The characteristics facilitate further improving the electrochemical property of the flexible electrode; and the flexible electrode is expected to become an excellent-property flexible electrode material of a lithium ion battery.

Description

technical field [0001] The invention relates to the field of electrode preparation, in particular to an electrode preparation method and its application. Background technique [0002] With the rapid advancement of electronic technology, more and more electronic devices are developing in the direction of thinner, lighter, more flexible and wearable. At present, the biggest difficulty facing flexible electronic devices is to find suitable flexible energy storage devices. When the traditional lithium-ion battery is bent or folded, it is easy to cause the electrode material and the current collector to separate, affect the electrochemical performance, and even cause a short circuit. Therefore, in order to adapt to the development of next-generation flexible electronic devices, flexible energy storage devices have become a research hotspot in recent years. The key to flexible energy storage devices lies in the preparation of flexible electrodes. [0003] Tin oxide (SnO 2 ) as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M10/0525H01M4/36H01M4/48H01M4/62D04H1/4382D04H1/728D06C7/00B82Y30/00
CPCB82Y30/00D04H1/4382D04H1/728D06C7/00H01M4/131H01M4/1391H01M4/366H01M4/48H01M4/628H01M10/0525Y02E60/10
Inventor 丁燕怀刘行
Owner XIANGTAN UNIV
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