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A kind of preparation method of conductive polymer/sulfur composite cathode material with sandwich structure

A composite positive electrode material and sandwich technology, which is applied in the direction of structural parts, battery electrodes, circuits, etc., can solve the problems of deterioration of the electrical contact of active materials and decrease of cycle stability, and achieve improved cycle performance and rate performance, high specific capacity, and inhibition Dissipated effect

Inactive Publication Date: 2018-11-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insulating insoluble Li 2 S and Li 2 S 2 Deposited on the surface of the positive electrode material, resulting in deterioration of the electrical contact of the active material and a decrease in cycle stability

Method used

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  • A kind of preparation method of conductive polymer/sulfur composite cathode material with sandwich structure
  • A kind of preparation method of conductive polymer/sulfur composite cathode material with sandwich structure
  • A kind of preparation method of conductive polymer/sulfur composite cathode material with sandwich structure

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A preparation method of a polyaniline / sulfur composite cathode material with a sandwich structure, comprising the following steps:

[0026] In the first step, first add 10 g of phosphoric acid, 0.5 g of aniline, 1 g of hydrogen peroxide and 0.02 g of ferric chloride to 200 ml of deionized water in sequence, and then stir and mix at a medium speed for 15 minutes with an electromagnetic stirrer. Then the uniformly mixed solution was put into a hydrothermal reaction kettle, and the reaction temperature was 130° C. in a dry box and kept for 8 hours. After the reaction, the product was centrifuged at a speed of 5000 rpm, and washed three times with deionized water and ethanol alternately. The obtained precipitate was placed in a vacuum drying oven, and dried at 40° C. for 12 hours to obtain hollow polyaniline spheres, which were collected for future use.

[0027] In the second step, the polyaniline hollow spheres prepared in the first step are added to 200ml deionized water...

Embodiment 2

[0031] A preparation method of a polyaniline / sulfur composite cathode material with a sandwich structure, comprising the following steps:

[0032] In the first step, first add 10 g of phosphoric acid, 0.5 g of aniline, 1 g of hydrogen peroxide and 0.08 g of ferric chloride to 200 ml of deionized water in sequence, and then stir and mix for 25 minutes at a medium speed with an electromagnetic stirrer. Then, the homogeneously mixed solution was put into a hydrothermal reaction kettle, and the reaction temperature was 160° C. in a dry box and kept for 6 hours. After the reaction, the product was centrifuged at a speed of 6000 rpm, and washed three times with deionized water and ethanol alternately. The obtained precipitate was placed in a vacuum drying oven and dried at 60° C. for 24 hours to obtain hollow polyaniline spheres, which were collected for future use.

[0033] In the second step, the polyaniline hollow spheres prepared in the first step are added to 200ml deionized w...

Embodiment 3

[0037] A preparation method of a polyaniline / sulfur composite cathode material with a sandwich structure, comprising the following steps:

[0038] In the first step, first add 10 g of phosphoric acid, 0.5 g of aniline, 1 g of hydrogen peroxide and 0.12 g of ferric chloride to 200 ml of deionized water in sequence, and then stir and mix at a medium speed for 30 minutes with an electromagnetic stirrer. Then, the uniformly mixed solution was put into a hydrothermal reaction kettle, and the reaction temperature was 180° C. in a dry box and kept for 4 hours. After the reaction, the product was centrifuged at a speed of 8000 rpm, and washed three times with deionized water and ethanol alternately. The obtained precipitate was placed in a vacuum drying oven and dried at 80° C. for 36 hours to obtain hollow polyaniline spheres, which were collected for future use.

[0039] In the second step, the polyaniline hollow spheres prepared in the first step are added to 200ml deionized water...

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Abstract

The invention relates to a preparation method for a conducting polymer / sulfur compound anode material with a sandwich structure. The method comprises the following steps: 1) preparing a polyaniline hollow ball by taking phosphoric acid, phenylamine, hydrogen peroxide and ferric chloride as raw materials according to a hydrothermal method; 2) preparing a polyaniline / sulfur sandwich compound material precursor by taking the polyaniline hollow ball, sodium thiosulfate pentahydrate, polyvinylpyrrolidone and hydrochloric acid as raw materials according to a normal temperature liquid phase compounding method; 3) synthesizing a polyaniline / sulfur sandwich compound anode material by taking the precursor, aniline, hydrochloric acid and ammonium persulfate as raw materials. The preparation method provided by the invention is simple in process, environment-friendly and suitable for industrial production. The prepared sandwich structure compound anode material applied to a lithium sulfur battery has the advantages of high specific capacity, excellent cycle performance, high rate capability, and the like.

Description

technical field [0001] The invention belongs to the technical field of electrode material preparation, and in particular relates to a preparation method of a conductive polymer / sulfur composite cathode material with a sandwich structure. Background technique [0002] With the rapid development of science and technology, people have put forward many requirements for mobile electronic devices: safer, faster, larger battery capacity, longer standby time, and traditional lithium-ion battery cathode materials such as lithium iron phosphate, etc., have lower Theoretical specific capacity limits further development. Lithium-sulfur batteries have a high specific capacity (1673mAh*g -1 ) and energy density (2600Wh*kg -1 ) has attracted widespread attention. However, the following disadvantages of lithium-sulfur batteries using elemental sulfur as the cathode material hinder their commercialization: [0003] 1. The insulation of elemental sulfur. Elemental sulfur is an insulator ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/366H01M10/0525Y02E60/10
Inventor 李昱严敏陈浩平航霍永奇余勇苏宝连
Owner WUHAN UNIV OF TECH
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