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Flexible sodium ion capacitor electrode material

A capacitor electrode, sodium ion technology, applied in the direction of hybrid capacitor electrodes, capacitors, electrolytic capacitors, etc., can solve the problem of easy powdering of metal bismuth, achieve the best electrical conductivity and mechanical properties, simplify the process flow, and avoid structure powdering. Effect

Pending Publication Date: 2022-07-29
华星先进科学技术应用研究(天津)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a flexible sodium ion capacitor electrode material, aiming to develop a flexible electrode material with excellent mechanical stability, high volume ratio performance, and fast electrochemical reaction kinetics for flexible sodium ion capacitors, to solve the problem of metal bismuth in When used as a negative electrode material, it is easy to pulverize due to the drastic volume change during the alloying process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Preparation of nano-bismuth / carbon nanotube two-dimensional thin film anode

[0058] Step 1: Dissolve sodium dodecyl sulfate in 500 mL of deionized water, keeping the concentration of the solution at 1.4 mgmL −1 , and stir with a magnetic stirrer for 30 min.

[0059] Step 2: Add carbon nanotubes to the sodium dodecyl sulfate solution in step 1 at a mass ratio of carbon nanotubes: sodium dodecyl sulfate = 1:2, stir with a magnetic stirrer for 2 h, and then mix The mixed solution was sonicated for 1 h to obtain a carbon nanotube dispersion; the carbon nanotube parameters used in this step were single-walled carbon nanotubes with a length of 10-30 μm.

[0060] Step 3: Use Bi(NO 3 ) 3 ·5H 2 Bi(NO 3 ) 3 ·5H 2 O, add it to the carbon nanotube dispersion obtained in step 2, stir with a magnetic stirrer for 4 h, and then sonicate the mixed solution for 40 min to obtain Bi(NO 3 ) 3 ·5H 2 O / carbon nanotube dispersion.

[0061] Step 4: Place the dispersion obtained i...

Embodiment 2

[0073] The only difference between Example 2 and Example 1 is that the instantaneous heating treatment time is 20 s.

Embodiment 3

[0075] The only difference between Example 3 and Example 1 is that the instantaneous heating treatment time is 25 s.

[0076] The performances of the electrode materials and capacitors prepared in Examples 1, 2, and 3 were tested. The test method for the electrochemical performance of the electrode material is as follows: (1) The electrochemical performance of each embodiment is tested by using a button-type CR2025 battery system (using the Xinwei battery test system, the voltage range is selected as 0.1-3.5 V, the current density is 0.1-5 A g −1 ); (2) assemble the flexible sodium ion capacitor in a glove box using a vacuum plastic bag, and the test conditions are the same as step (1).

[0077] 1. X-ray diffraction analysis

[0078] X-ray diffraction analysis was carried out to the negative electrode material prepared in Example 1, and the results were as follows figure 1 shown. figure 1 This is the X-ray diffraction pattern of the nano-bismuth / carbon nanotube negative el...

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Abstract

The invention provides a flexible sodium ion capacitor electrode material which is a bismuth nanoparticle-loaded carbon-based two-dimensional film electrode material obtained by instantaneously heating a metal bismuth salt-loaded carbon-based two-dimensional film. The nano-scale metal bismuth is successfully loaded on the carbon-based two-dimensional film by means of combining vacuum filtration with instantaneous heating, the volume change of bismuth in the alloying process can be effectively relieved through nano-scale size distribution, the problem that the volume change of the metal bismuth is violently changed in the alloying process is solved, and the preparation process is simplified. Structural pulverization of the flexible electrode is effectively avoided, and it is ensured that the flexible sodium ion capacitor obtains excellent cycling stability. Meanwhile, the carbon-based material serves as an instantaneous heating substrate and has excellent structural stability, and the carbon-based substrate can be prevented from being damaged by second-level heating time.

Description

technical field [0001] The invention belongs to the field of secondary battery electrode materials. Specifically, the present invention relates to a flexible sodium ion capacitor electrode material. Background technique [0002] At present, highly integrated wearable electronic devices are widely used in people's lives, and lightweight and flexible portable electronic devices are changing people's lifestyles. At the same time, flexible wearable electronic products need energy storage devices with high volume ratio to be driven to achieve long battery life and meet complex working conditions (such as mechanical deformation). Compared with other existing energy storage systems, lithium-ion batteries are currently the best performing energy storage devices in mobile device applications, with the highest energy density per unit mass / volume, long service life, and wide operating temperature range. Research on flexible lithium-ion batteries has attracted extensive attention from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/06H01G11/30H01G11/36H01G11/86
CPCH01G11/06H01G11/36H01G11/30H01G11/86Y02E60/13
Inventor 王恭凯
Owner 华星先进科学技术应用研究(天津)有限公司
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