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A kind of preparation method of sulfur/polypyrrole composite cathode material

A composite cathode material, polypyrrole technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of low effective sulfur load and unstable battery electrochemical performance.

Active Publication Date: 2021-05-18
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned prior art of polypyrrole hollow microspheres / sulfur composite materials has improved the performance of lithium-sulfur batteries to a certain extent, the defects still exist, the effective loading of sulfur in the positive electrode material is low, and the polysulfide "shuttle effect" Obviously, the electrochemical performance of the battery is unstable

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  • A kind of preparation method of sulfur/polypyrrole composite cathode material
  • A kind of preparation method of sulfur/polypyrrole composite cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Add 2g of bulk silica to 50mL of methanol: acetonitrile (v / v=1:1) solution, the particle size of silica balls is 25nm

[0026] (2) Add 0.25g of pyrrole to the above solution and stir for 1 hour

[0027] (3) Add 20ml of ferric chloride solution dropwise to the above solution, take out the solid product after ultrasonication for 5 hours at room temperature, rinse the surface of the silica with deionized water, and obtain polypyrrole / silica composite material, ferric chloride The solution solubility is 0.5mol / L;

[0028] (4) Soak the composite material with 20wt% hydrofluoric acid solution, etch at a constant temperature of 60°C for 5 days, then wash it with deionized water and absolute ethanol for 5 times, and dry at 60°C for 24 hours to obtain polypyrrole porous balls. The shape is spherical, and the spherical holes are uniformly and densely connected with each other;

[0029] (5) Dissolve elemental sulfur in carbon disulfide, add sulfur carbon disulfide solution d...

Embodiment 2

[0036] (1) Add 2g of bulk silica to 50mL methanol: acetonitrile (v / v=1:1) solution, the particle size of silica is 25nm

[0037] (2) Add 0.25g of pyrrole to the above solution and stir for 1 hour

[0038] (3) 10ml of ferric chloride solution was added dropwise, and the solid product was taken out after ultrasonication at room temperature for 5 hours, and the surface of the silica was rinsed with deionized water to obtain polypyrrole / silicon dioxide composite material, and the solubility of the ferric chloride solution was 0.5mol / L;

[0039] (4) Soak the composite material with 20wt% hydrofluoric acid solution, etch at a constant temperature of 60°C for 5 days, then wash it with deionized water and absolute ethanol for 5 times, and dry at 60°C for 24 hours to obtain polypyrrole porous balls. The shape is spherical, and the spherical holes are uniformly and densely connected with each other;

[0040] (5) Dissolve elemental sulfur in carbon disulfide, add sulfur carbon disulfid...

Embodiment 3

[0044] (1) Add 2g of bulk silica to 50mL methanol: acetonitrile (v / v=1:1) solution, the particle size of silica is 25nm

[0045] (2) Add 0.25g of pyrrole to the above solution and stir for 1 hour

[0046] (3) 30ml ferric chloride solution was added dropwise, and the solid product was taken out after ultrasonication at room temperature for 5 hours, and the silicon dioxide surface was rinsed with deionized water to obtain a polypyrrole / silicon dioxide composite material, and the solubility of the ferric chloride solution was 0.5mol / L;

[0047] (4) Soak the composite material with 20wt% hydrofluoric acid solution, etch at a constant temperature of 60°C for 5 days, then wash it with deionized water and absolute ethanol for 5 times, and dry at 60°C for 24 hours to obtain polypyrrole porous balls. The shape is spherical, and the spherical holes are uniformly and densely connected with each other;

[0048] (5) Dissolve elemental sulfur in carbon disulfide, add sulfur carbon disulfi...

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Abstract

The invention relates to a preparation method of a sulfur / polypyrrole composite cathode material. The method comprises the following steps: adding block silicon dioxide obtained after the silica sol is dried into the mixed solution; adding pyrrole, and then adding ferric chloride solution dropwise to obtain polypyrrole / silicon dioxide composite material with hydrogen fluoride Soak in acid solution, add sulfur in carbon disulfide solution dropwise, and heat at 120-180°C for 8-36 hours under an inert atmosphere. The invention adapts to the volume expansion effect in the charge and discharge process, and its porous structure can absorb discharge product polysulfides to improve the electrochemical performance of the material.

Description

technical field [0001] The invention relates to a preparation process of a sulfur / polypyrrole composite positive electrode material, in particular to a preparation method of a lithium-sulfur battery positive electrode material. Background technique: [0002] A lithium-sulfur battery is a battery system in which elemental sulfur is used as the positive electrode and metallic lithium is used as the negative electrode. Lithium-sulfur batteries have the advantages of high specific energy (2600Wh / kg), high specific capacity (1675mAh / g), high environmental friendliness, and low cost, and are considered to be a promising new generation of batteries. However, there are still many serious problems in lithium-sulfur batteries that limit its application, mainly including: 1) Elemental sulfur is an insulator at room temperature, and its conductivity is poor. The conductivity of elemental sulfur at room temperature is 5×10 -30 s / cm,; 2) There is a shuttle effect, which reduces the utili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/624H01M10/052Y02E60/10
Inventor 张永光任俊
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN