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Aqueous polyaniline cathode material of lithium-sulfur battery and preparation method therefor

A technology of water-based polyaniline and polyaniline lithium, which is applied in the field of electrochemistry and can solve problems such as dispersion

Active Publication Date: 2016-03-09
中科应化(长春)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing lithium-sulfur battery electrode materials cannot be dispersed in water, and to provide a water-based polyaniline lithium-sulfur battery positive electrode material and its preparation method

Method used

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  • Aqueous polyaniline cathode material of lithium-sulfur battery and preparation method therefor
  • Aqueous polyaniline cathode material of lithium-sulfur battery and preparation method therefor
  • Aqueous polyaniline cathode material of lithium-sulfur battery and preparation method therefor

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preparation example Construction

[0033] The present invention firstly provides a kind of preparation method of aqueous polyaniline lithium-sulfur battery cathode material, comprises the following steps:

[0034] Step 1: mixing graphene oxide and water-based polyaniline nanofiber powder to obtain mixed solution A;

[0035] Step 2: adding the sodium thiosulfate aqueous solution to the mixed solution A obtained in step 1, and then adding hydrochloric acid to react to obtain the mixed solution B;

[0036] Step 3: Adding hydriodic acid to the mixed solution B obtained in Step 2 to react to obtain the positive electrode material of the aqueous polyaniline lithium-sulfur battery.

[0037] According to the present invention, the preparation method of described aqueous polyaniline nanofiber powder preferably comprises:

[0038] (1) adding the aniline monomer into the aqueous mineral acid solution to obtain a mixed solution a; the concentration of the aqueous inorganic acid solution is preferably 1 to 2 mol / L; the con...

Embodiment 1

[0051] The preparation of embodiment 1 waterborne polyaniline nanofiber powder

[0052] Step 1. Dissolve 5.00 grams of aniline in 200 mL of 1 mol / L hydrochloric acid solution, and stir evenly to obtain a mixed solution a;

[0053] Step 2, dissolve 9.50 grams of ammonium persulfate in 200 mL of 2mol / L hydrochloric acid solution, stir evenly and fully dissolve to obtain mixed solution b;

[0054] Step 3, the mixed solution a and the mixed solution b were placed at -5°C for 20 minutes to cool in advance, and then the mixed solution b was poured into the mixed solution a at one time, stirred for 30 seconds, and left at room temperature for 24 hours to obtain the reaction product;

[0055] Step 4, washing the reaction product obtained in step 3 with deionized water, ammonia water alkali washing, ethanol washing, and deionized water to neutrality to obtain polyaniline powder;

[0056] Step 5: Add 60 g of deionized water and 8 g of water-based phosphate ester dopant to the polyanili...

Embodiment 2

[0057] Embodiment 2 Preparation of water-based polyaniline nanofiber powder

[0058] Step 1. Dissolve 2.00 grams of aniline in 100 mL of 2mol / L hydrochloric acid solution, and stir evenly to obtain a mixed solution a;

[0059] Step 2, dissolve 3.0 grams of ammonium persulfate in 100 mL of 2mol / L nitric acid solution, stir evenly and fully dissolve to obtain mixed solution b;

[0060] Step 3, the mixed solution a and the mixed solution b were placed at 0°C for 50 minutes to cool in advance, and then the mixed solution b was poured into the mixed solution a at one time, stirred for 60 seconds, and left at room temperature for 36 hours to obtain the reaction product;

[0061] Step 4, washing the reaction product obtained in step 3 with deionized water, ammonia water alkali washing, ethanol washing, and deionized water to neutrality to obtain polyaniline powder;

[0062] Step 5: Add 11g of deionized water and 3.5g of water-based sulfonate dopant to the polyaniline powder obtained...

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Abstract

The present invention provides an aqueous polyaniline cathode material of a lithium-sulfur battery and a preparation method therefor, and belongs to the field of electrochemistry. The material and method solve a problem that conventional lithium-sulfur battery electrode materials cannot be dispersed in water. The method comprises: mixing graphite oxide and aqueous polyaniline to obtain a mixed solution A; adding a sodium thiosulfate aqueous solution into the mixed solution A, and adding hydrochloric acid to react, thereby obtaining a mixed solution B; and adding hydroiodic acid into the mixed solution B to react, thereby obtaining the aqueous polyaniline cathode material of the lithium-sulfur battery. The present invention further provides the aqueous polyaniline cathode material of the lithium-sulfur battery prepared by the preparation method. The aqueous polyaniline cathode material of the lithium-sulfur battery disclose by the present invention has good dispersibility in water, an initial specific capacitance in a 5C charge-discharge rate of a battery assembled by the obtained cathode material is 455-865mAh / g, and the specific capacitance remains at 24%-31% after charge and discharge for 100 cycles.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a water-based polyaniline lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries use elemental sulfur as the positive electrode reactant, and elemental lithium or lithium alloys as the negative electrode material. During discharge, the negative electrode reaction is that lithium loses electrons and becomes lithium ions, and the positive electrode reaction is that sulfur reacts with lithium ions and electrons to form sulfide. The potential difference between the positive electrode and the negative electrode reaction is the discharge voltage of the lithium-sulfur battery. According to the unit mass of elemental sulfur is completely changed into S 2- According to the provided electricity, the theoretical specific capacity of sulfur is 1675mAh / g, and the theoretical specific capacity of elemental l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M10/052H01M4/583
CPCH01M4/139H01M4/362H01M4/583H01M10/052Y02E60/10
Inventor 李颖张红明王献红王佛松
Owner 中科应化(长春)科技有限公司