Flexible thin film electrode material and preparation method thereof

A technology of flexible thin film and electrode materials, which is applied in the field of capacitors, can solve the problems of small capacity of pseudocapacitive materials, waste of space volume, low volume energy density and low power density, so as to improve volume energy density, avoid waste of pore space, and large The effect of specific capacity

Active Publication Date: 2015-12-30
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

There are usually two types of traditional flexible supercapacitors: one is to use carbon-based materials (such as carbon nanotubes or graphene self-supporting films) as electrodes. Although they have excellent flexibility and conductivity, carbon materials are based on electric double layers. Compared with the redox reaction mechanism, the capacity of the pseudocapacitive material is small; the s

Method used

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  • Flexible thin film electrode material and preparation method thereof
  • Flexible thin film electrode material and preparation method thereof
  • Flexible thin film electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Prepare flexible thin film electrode materials, the specific steps are as follows:

[0038] 1) 0.2g vanadium pentoxide (V 2 o 5 ) and 0.45 g of oxalic acid dihydrate (H 2 C 2 o 4 2H 2 O) Add 10 ml of acetone (CH 3 COCH 3 ) and 25 milliliters of water, stirred with a water-bath magnetic stirrer at 40°C for 24 hours to obtain a uniform blue solution;

[0039] 2) The 10-micron ultra-thin titanium sheet is ultrasonically washed in hydrochloric acid and deionized water in sequence, dried, and one side is covered with a thick titanium sheet, and then placed in the water of the polytetrafluoroethylene liner substrate together with the above-mentioned stirred solution. In a thermal reaction kettle, conduct a hydrothermal reaction at 180°C for 18 hours to form a vanadium dioxide nanosheet array on the surface of the titanium sheet, then take out the titanium sheet with the nanosheet array, wash and dry it with deionized water, and place it on the titanium sheet Add (0.16...

Embodiment 2

[0044] To prepare an all-solid-state asymmetric flexible film supercapacitor, the specific steps are as follows:

[0045] Carbon-coated vanadium trioxide (V 2 o 3 C) Nanosheet arrays are used as positive and negative electrodes, and lithium chloride / polyvinyl alcohol (LiCl / PVA) gel is used as a quasi-solid electrolyte (the preparation method is: first prepare a 5mol / L lithium chloride solution, and then add polyvinyl alcohol powder , the mass ratio of polyvinyl alcohol powder to lithium chloride solution is 0.1g / mL, stirred in a water bath at 85°C for 2-3 hours, and left to cool to obtain), assembled into an all-solid asymmetric flexible film supercapacitor. Such as Figure 11 It is a scanning electron microscope image of the cross-section of the supercapacitor, in which the electrodes are fully in contact with the electrolyte, and the thickness of the entire device is about 40 microns.

[0046] The electrochemical performance of the supercapacitor was tested, Figure 12 I...

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Abstract

The invention relates to a flexible thin film electrode material and a preparation method thereof. The electrode material adopts an ultrathin titanium sheet as a substrate, a layer of intensively arranged vanadium trioxide nanosheet array is distributed on the substrate; the surface of the vanadium trioxide nanosheet array is also coated with a layer of carbon material. The preparation method comprises the following steps: firstly, hydrothermally generating the vanadium trioxide nanosheet array on the ultrathin titanium sheet, and then conducting carbon coating by taking glucose as a carbon source to form the vanadium trioxide @ carbon compound nanosheet array, namely the flexible thin film electrode material. The electrode material can be used as a positive electrode and a negative electrode at the same time to assemble a supercapacitor. The method is simple to operate and facilitates realization of mass production, the obtained capacitor has excellent flexibility, the whole capacitor is only 40 micrometers in thickness, dissymmetrical energy storage principle, high voltage and high volume energy density are shown, and the flexible thin film electrode material can be used for the fields of flexible wearable electronic products and the like, and is hopeful to generate excellent social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of capacitors, and relates to a flexible film electrode material and a preparation method thereof. Background technique [0002] With the continuous development of flexible electronic products, flexible energy storage devices have also emerged. Among them, flexible film supercapacitors have shown great application prospects due to their advantages such as high power and fast charging capabilities, such as in flexible display devices, flexible electronic skins, etc. It has potential applications in wearable electronic devices and other aspects. There are usually two types of traditional flexible supercapacitors: one is to use carbon-based materials (such as carbon nanotubes or graphene self-supporting films) as electrodes. Although they have excellent flexibility and conductivity, carbon materials are based on electric double layers. Compared with the redox reaction mechanism, the capacity of the pseudocapac...

Claims

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Application Information

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IPC IPC(8): H01G11/22H01G11/26H01G11/30
CPCY02E60/13
Inventor 刘金平许盼
Owner WUHAN UNIV OF TECH
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