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Three-dimensional ordered porous structure hydrogel-supported sulfur particle composite material and preparation method thereof, cathode for lithium-sulfur battery, lithium-sulfur battery

A three-dimensional ordered, porous structure technology, applied in the field of nanomaterials, can solve problems that hinder the practical application of lithium-sulfur batteries, polysulfide shuttle phenomenon, low conductivity, etc., to improve electron transport capabilities, improve battery performance, and good conductivity rate effect

Active Publication Date: 2021-09-28
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, problems such as low conductivity, volume expansion, and "polysulfide shuttling phenomenon" in lithium-sulfur batteries have seriously hindered the practical application of lithium-sulfur batteries.

Method used

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  • Three-dimensional ordered porous structure hydrogel-supported sulfur particle composite material and preparation method thereof, cathode for lithium-sulfur battery, lithium-sulfur battery
  • Three-dimensional ordered porous structure hydrogel-supported sulfur particle composite material and preparation method thereof, cathode for lithium-sulfur battery, lithium-sulfur battery
  • Three-dimensional ordered porous structure hydrogel-supported sulfur particle composite material and preparation method thereof, cathode for lithium-sulfur battery, lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for preparing a three-dimensional ordered porous structure hydrogel-loaded sulfur particle composite material, comprising the following steps:

[0044] A. Dissolve 1 ml of aniline and 1 ml of phytic acid in 10 ml of water, stir in an ice-water bath for 10 minutes, add 20 ml of ammonium persulfate solution containing 3 g of ammonium persulfate, and continue stirring for 10 minutes in an ice-water bath at 0°C , to obtain a uniformly mixed conductive hydrogel polyaniline sol.

[0045] B. Take 2 milliliters of commercial 2.5% polystyrene solution with a diameter of 500 nanometers, place it in 30 milliliters of water, ultrasonicate for 30 minutes, add the resulting polystyrene solution onto the tungsten substrate, and dry it at 50°C for 12 Hours, a polystyrene template with a three-dimensional ordered structure was obtained.

[0046] C. Take 1 ml of the conductive hydrogel polyaniline sol obtained in step A and add it dropwise to the polystyrene template with three...

Embodiment 2

[0049] A method for preparing a three-dimensional ordered porous structure hydrogel-loaded sulfur particle composite material, comprising the following steps:

[0050]A. Dissolve 1 milliliter of aniline and 2 milliliters of phytic acid in 10 milliliters of water, stir in an ice-water bath for 10 minutes, add 20 milliliters of ammonium persulfate solution in which 7 grams of ammonium persulfate is dissolved, and continue stirring at 1°C for 10 minutes in an ice-water bath Minutes to obtain a uniformly mixed conductive hydrogel polyaniline sol.

[0051] B. Take 1 milliliter of a commercial 2.5% polystyrene solution with a diameter of 500 nanometers, place it in 30 milliliters of water, ultrasonicate for 30 minutes, add the polystyrene solution dropwise on the tungsten substrate, and dry it at a constant temperature at 60°C for 10 hours. A polystyrene template with a three-dimensional ordered structure was obtained.

[0052] C. Take 1 ml of the conductive hydrogel polyaniline so...

Embodiment 3

[0055] A method for preparing a three-dimensional ordered porous structure hydrogel-loaded sulfur particle composite material, comprising the following steps:

[0056] A. Dissolve 2 ml of aniline and 4.3 ml of phytic acid in 10 ml of water, stir in an ice-water bath for 10 minutes, add 30 ml of ammonium persulfate solution with 10 grams of ammonium persulfate dissolved in it, and continue stirring for 10 minutes in an ice-water bath at 3°C , to obtain a uniformly mixed conductive hydrogel polyaniline sol.

[0057] B. Take 2 milliliters of commercial 2.5% polystyrene solution with a diameter of 500 nanometers, place it in 30 milliliters of water, ultrasonicate for 30 minutes, add the polystyrene solution to the tungsten substrate, and dry it at 65°C for 10 minutes Hours, a polystyrene template with a three-dimensional ordered structure was obtained.

[0058] C. Take 1 ml of the conductive hydrogel polyaniline sol obtained in step A and add it dropwise to the polystyrene templa...

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Abstract

The invention provides a three-dimensional ordered porous structure hydrogel-loaded sulfur particle composite material and its preparation method, lithium-sulfur battery positive electrode, and lithium-sulfur battery. Compared with the prior art, the invention uses a template method to synthesize three-dimensional ordered porous The conductive hydrogel polyaniline is loaded with sulfur particles by means of sulfur fumigation. The porous structure is conducive to the loading of sulfur. Polyaniline can solve the shortcomings of poor conductivity of the sulfur positive electrode and polysulfide shuttle, so as to improve the battery capacity. For the purpose of performance, this material is applied to the cathode material of lithium-sulfur battery, which has the advantages of good cycle stability and high specific energy density. The prepared polyaniline-loaded sulfur-loaded three-dimensional ordered porous structure composite material has a good three-dimensional structure and a large relative area, which is conducive to loading more sulfur particles and has good electrical conductivity; moreover, it can combine polysulfides to relieve polysulfide The shuttle effect of substances; used as a cathode material for lithium-sulfur batteries, it has large capacity and good cycle performance.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a three-dimensional ordered porous structure hydrogel-loaded sulfur particle composite material and a preparation method thereof, a positive electrode of a lithium-sulfur battery, and a lithium-sulfur battery. Background technique [0002] At present, the problem of resources is becoming more and more prominent, and lithium batteries are widely used because of their advantages such as cleanness, high specific capacity, stable electrochemical performance and long service life. However, with the further improvement of people's quality of life, especially the application in fields such as power vehicles, higher requirements are put forward for lithium batteries with high energy density. [0003] Among them, the lithium-sulfur battery has a high capacity of 1675mAh g -1 The theoretical capacity has attracted widespread attention. A lithium-sulfur battery is mainly composed of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/624H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 刘金云周萍李金金刘锦淮
Owner ANHUI NORMAL UNIV
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