Preparation method of polyaniline/sulfur composite material with hollow core-shell structure

A composite material, core-shell structure technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of no improvement in cycle life and rate performance, and achieve the effect of being conducive to industrial production, simple process and convenient operation

Inactive Publication Date: 2015-05-20
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Obviously, the polymer / sulfur composites obtained by co-heating sulfur with polymers have good initial capacity, but so far, the cycle life and rate performance have not improved.

Method used

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  • Preparation method of polyaniline/sulfur composite material with hollow core-shell structure
  • Preparation method of polyaniline/sulfur composite material with hollow core-shell structure

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A polyaniline / sulfur composite material with a hollow core-shell structure; polyaniline / sulfur is a single-layer structure, and the composition is designed as follows:

[0028] Sulfur, 80wt%; Polyaniline 20wt%;

[0029] The preparation of polyaniline / sulfur composites includes the following steps:

[0030] 1) Weigh 0.4g of silicon dioxide, pour it into an alcohol solution containing 0.2g of aniline, and ultrasonically disperse for 5 hours; wherein, the particle size of silicon dioxide is 10nm;

[0031] 2) In the product of step 1, an initiator is added, aniline is polymerized and coated with silica; centrifuged and dried to obtain a polyaniline / silica composite material;

[0032] 3) Immerse the product of step 2 in a sufficient amount of sulfur / carbon disulfide saturated solution; filter and dry; repeat step 3 for immersion, filtration, and drying operations 2 to 10 times to obtain a sulfur / polyaniline / silicon dioxide composite material;

[0033] 4) Immerse the produc...

Embodiment 2

[0036] A sulfur / polyaniline composite material with a hollow core-shell structure; polyaniline / sulfur / polyaniline / sulfur / polyaniline is a three-layer structure, and the composition is designed as follows:

[0037] Sulfur, 76wt%; Polyaniline 24wt%;

[0038] The preparation of polyaniline / sulfur composites includes the following steps:

[0039] 1) Weigh 0.4g of silicon dioxide, pour it into an alcohol solution containing 0.08g of aniline, and ultrasonically disperse for 6 hours; wherein, the particle size of silicon dioxide is 10nm;

[0040] 2) In the product of step 1, an initiator is added, aniline is polymerized and coated with silica; centrifuged and dried to obtain a polyaniline / silica composite material;

[0041] 3) Immerse the product of step 2 in a sufficient amount of sulfur / carbon disulfide saturated solution; filter and dry; repeat step 3 for immersion, filtration, and drying operations 2 to 10 times to obtain a sulfur / polyaniline / silicon dioxide composite material; ...

Embodiment 3

[0047] A sulfur / polyaniline composite material with a hollow core-shell structure; sulfur / polyaniline / sulfur / polyaniline / sulfur / polyaniline is a three-layer structure, and the composition is designed as follows:

[0048] Sulfur, 70wt%; Polyaniline 30wt%;

[0049] The preparation of polyaniline / sulfur composites includes the following steps:

[0050] 1) Weigh 0.4g of silicon dioxide, pour into an alcohol solution containing 0.1g of aniline, and ultrasonically disperse for 4 hours; wherein, the particle size of silicon dioxide is 10nm;

[0051] 2) In the product of step 1, an initiator is added, aniline is polymerized and coated with silica; centrifuged and dried to obtain a polyaniline / silica composite material;

[0052] 3) Immerse the product of step 2 in a sufficient amount of sulfur / carbon disulfide saturated solution; filter and dry; repeat step 3 for immersion, filtration, and drying operations 2 to 10 times to obtain a sulfur / polyaniline / silicon dioxide composite materia...

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Abstract

The invention relates to a preparation method of a polyaniline / sulfur composite material with a hollow core-shell structure. The composite material has the core-shell structure with 1-5 layers of polyaniline / sulfur. The preparation method comprises the following steps: by taking nano-silica as a template, coating nano-silica with polyaniline, depositing elemental sulfur, and depositing silicic acid; performing coating with polyaniline, depositing elemental sulfur, performing coating with polyaniline and repeating the operation; and finally removing silicon dioxide and silicic acid. The space between every two polyaniline / sulfur composite layers is controlled within 0-10nm; and the thickness of each polyaniline / sulfur composite layer is controlled within 1-20nm. When applied to the anode of a lithium-sulfur battery, the composite material has excellent cycle performance, namely, the discharge capacity of a0.5C lithium-sulfur battery is greater than 300mAh / g when the cycle number is 200; and the composite has a good application prospect in the field of batteries.

Description

technical field [0001] The invention relates to a preparation method of an electrode material, in particular to a preparation method of a polyaniline / sulfur composite material with a hollow core-shell structure. Background technique [0002] Sulfur has the advantages of high specific capacity and low price, and is a promising electrode material in the future. However, the conductivity of sulfur is very poor, and the volume expansion and contraction of sulfur during the charging and discharging process will change the structure of the electrode material and separate from the metal current collector, resulting in rapid capacity decay and low sulfur utilization during cycling. Coating or doping with conductive polymers is an effective way to improve the cycle performance of sulfur cathodes. Conductive polymers have good conductivity and can form a three-dimensional conductive network; conductive polymers have good flexible chains, which can alleviate the volume change of sulfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/362H01M4/366Y02E60/10
Inventor 范美强位攀吴汉美杨秀茹李婷陈金丹陈达柴文详田光磊
Owner CHINA JILIANG UNIV
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