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Polypyrrole hollow microsphere/ sulfur composite material as well as preparation method and application thereof

A technology of hollow microspheres and composite materials, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low sulfur utilization rate and low capacity, and achieve the effects of environmental friendliness, high capacity and stable cycle performance

Inactive Publication Date: 2013-08-21
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention uses polysulfide rubber as the basic material, which can be used as the positive electrode material of lithium-sulfur battery after the vulcanization reaction with sulfur directly. Although it has good cycle performance, the energy storage mechanism of this material is based on the breaking of sulfur-sulfur bonds and link, the utilization of sulfur is lower and therefore the capacity is lower

Method used

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  • Polypyrrole hollow microsphere/ sulfur composite material as well as preparation method and application thereof
  • Polypyrrole hollow microsphere/ sulfur composite material as well as preparation method and application thereof
  • Polypyrrole hollow microsphere/ sulfur composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of step that prepares polypyrrole hollow microsphere / sulfur composite material with silicon dioxide microsphere, ferric chloride, pyrrole, hydrofluoric acid, water and sulfur powder as raw material is as follows:

[0035] (1) Weigh 0.9 g of silica microspheres and 1 mL of pyrrole respectively, mix with 150 mL of deionized water, and disperse by ultrasonic to form a suspension;

[0036] (2) Weigh 2.4 g of ferric chloride and dissolve it in 50 mL of deionized water to prepare ferric chloride solution;

[0037] (3) Add dropwise the ferric chloride solution prepared in step (2) to the suspension prepared in step (1), stir and react at room temperature for 24 hours to obtain a black precipitate;

[0038] (4) Dissolve 10mL of 40wt% hydrofluoric acid in 30mL of deionized water to prepare a 10wt% hydrofluoric acid solution;

[0039] (5) Wash the black precipitate prepared in step (3) with deionized water, dry it, mix it with the hydrofluoric acid prepared in step (4) an...

Embodiment 2

[0044] A kind of step that prepares polypyrrole hollow microsphere / sulfur composite material with silicon dioxide microsphere, ferric chloride, pyrrole, hydrofluoric acid, water and sulfur powder as raw material is as follows:

[0045] (1) Weigh 0.4 g of silica microspheres and 1 mL of pyrrole respectively, mix with 150 mL of deionized water, and disperse by ultrasonic to form a suspension;

[0046] (2) Weigh 2.4 g of ferric chloride and dissolve it in 50 mL of deionized water to prepare ferric chloride solution;

[0047] (3) Add dropwise the ferric chloride solution prepared in step (2) to the suspension prepared in step (1), stir and react for 30 h at room temperature to obtain a black precipitate;

[0048] (4) Dissolve 10mL of 40wt% hydrofluoric acid in 30mL of deionized water to prepare a 10wt% hydrofluoric acid solution;

[0049] (5) Wash the black precipitate prepared in step (3) with deionized water, dry it, mix it with the hydrofluoric acid prepared in step (4) and le...

Embodiment 3

[0052] A kind of step that prepares polypyrrole hollow microsphere / sulfur composite material with silicon dioxide microsphere, ferric chloride, pyrrole, hydrofluoric acid, water and sulfur powder as raw material is as follows:

[0053] (1) Weigh 0.9 g of silica microspheres and 1 mL of pyrrole respectively, mix with 150 mL of deionized water, and disperse by ultrasonic to form a suspension;

[0054] (2) Weigh 2.4 g of ferric chloride and dissolve it in 50 mL of deionized water to prepare ferric chloride solution;

[0055] (3) Add dropwise the ferric chloride solution prepared in step (2) to the suspension prepared in step (1), stir and react at room temperature for 12 hours to obtain a black precipitate;

[0056] (4) Dissolve 10mL of 40wt% hydrofluoric acid in 30mL of deionized water to prepare a 10wt% hydrofluoric acid solution;

[0057] (5) Wash the black precipitate prepared in step (3) with deionized water, dry it, mix it with the hydrofluoric acid prepared in step (4) an...

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Abstract

The invention discloses a polypyrrole hollow microsphere / sulfur composite material which comprises a polypyrrole hollow microsphere and powdered sulfur, wherein the powdered sulfur is dispersed and absorbed on the polypyrrole hollow microsphere, so that a uniform compound can be formed. The invention also discloses a preparation method of the polypyrrole hollow microsphere / sulfur composite material. The method comprises the following steps of: firstly, initiating the polymerization reaction of pyrrole under the action of an oxidizing agent, and covering the surface of a silicon dioxide microsphere by the product; then washing, drying and then dissolving the silicon dioxide microsphere by hydrofluoric acid to obtain the polypyrrole hollow microsphere; and then, fully grinding the powdered sulfur with certain mass and the polypyrrole hollow microsphere, evenly mixing, and carrying out heat treatment at a certain temperature to obtain the polypyrrole hollow microsphere / sulfur composite material. The method is low in energy consumption, simple in operation, good in controllability, high in yield and suitable for large-scale production. The invention also discloses the application of the polypyrrole hollow microsphere / sulfur composite material. The polypyrrole hollow microsphere / sulfur composite material is used for a cathode material of a lithium sulfur battery and has the characteristics of high capacity and stable cycle performance.

Description

technical field [0001] The invention relates to the field of preparation of lithium-sulfur battery materials, in particular to a polypyrrole hollow microsphere / sulfur composite material and its preparation method and application. Background technique [0002] The rapid development of electric vehicles and mobile electronic devices urgently requires the development of batteries with higher energy density. As an emerging lithium-ion battery system, lithium-sulfur secondary batteries use metal lithium as the negative electrode and elemental sulfur as the positive electrode. Lithium-sulfur secondary batteries have two discharge platforms (approximately 2.4V and 2.1V), but their electrochemical reaction mechanism is relatively complicated, and there is no conclusion yet. The theoretical specific energy of lithium-sulfur secondary batteries can reach 2600Wh / kg (the theoretical specific capacities of lithium and sulfur are 3860mAh / g and 1675mAh / g, respectively), which is much high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCY02E60/10
Inventor 张俊董字敏杜高辉刘亚吴一姗徐春美
Owner ZHEJIANG NORMAL UNIVERSITY
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