Method for preparing polyaniline/sulfur/graphene composite material

A composite material, graphene technology, applied in electrode manufacturing, electrical components, battery electrodes, etc., can solve the problems of sulfur particle shedding, cycle capacity, attenuation, etc., and achieve the effect of being conducive to industrial production, simple process, and convenient operation

Inactive Publication Date: 2015-05-06
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] It is undeniable that the graphene material with novel structure and small pore size effectively limits the particle size of sulfur element, and at the same time, the graphene material with good conductivity improves the conductivity of element sulfur. The volume expansion and contraction of the sulfur particles, if there is no other coating on the surface of the sulfur particles, the sulfur particles will inevitably fall off and cause the cycle capacity decay phenomenon

Method used

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  • Method for preparing polyaniline/sulfur/graphene composite material
  • Method for preparing polyaniline/sulfur/graphene composite material
  • Method for preparing polyaniline/sulfur/graphene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The composition of a polyaniline / sulfur / graphene composite is designed as:

[0027] Polyaniline, 12wt%; Sulfur element, mass fraction 75%; Graphene, mass fraction 13wt%;

[0028] A kind of preparation method of polyaniline / sulfur / graphene composite material: comprise the following steps:

[0029] 1) Weigh 12.4 grams of sodium thiosulfate pentahydrate and mix it with 20 ml of deionized water to configure sodium thiosulfate solution:

[0030] 2) The molar ratio of organic acid to sodium thiosulfate is 1.2, weigh 6 grams of oxalic acid and 0.277 grams of graphene, dissolve in 30 milliliters of tetrahydrofuran, and ultrasonically vibrate for 5 hours;

[0031] 3) Slowly pour the sodium thiosulfate solution in step 1 into the mixed solution in step 2, stir at a constant speed, and reflux at 50° C. for 4 hours;

[0032] 4) Add 0.3 g of aniline to the product of step 3, and stir at a constant speed for 5 h;

[0033] 5) In the product of step 4, pour the initiator, stir, stan...

Embodiment 2

[0036] The composition of a polyaniline / sulfur / graphene composite is designed as:

[0037] Polyaniline, 6wt%; Sulfur element, mass fraction 79%; Graphene, mass fraction 15wt%;

[0038] Polyaniline, 9wt%; Sulfur element, mass fraction 79%; Polyaniline, mass fraction 12wt%;

[0039] Polyaniline, 15wt%; Sulfur element, mass fraction 75%; Polyaniline, mass fraction 10wt%;

[0040] A kind of preparation method of polyaniline / sulfur / graphene composite material: comprise the following steps:

[0041] 1) Weigh a certain amount of sodium thiosulfate pentahydrate and mix it with deionized water to configure sodium thiosulfate solution:

[0042] 2) The molar ratio of organic acid to sodium thiosulfate is 1.3, weigh a certain organic acid, dissolve it in acetone, and oscillate ultrasonically for 10 hours;

[0043] 3) Slowly pour the sodium thiosulfate solution in step 1 into the mixed solution in step 2, stir at a constant speed, and reflux at 60° C. for 5 hours;

[0044] 4) Add anili...

Embodiment 3

[0048] The composition design of a kind of polyaniline / sulfur / graphene composite material is the same as embodiment 1,

[0049] Include the following steps:

[0050] 1) Weigh a certain amount of sodium thiosulfate pentahydrate and mix it with deionized water to configure sodium thiosulfate solution:

[0051] 2) The molar ratio of benzenesulfonic acid to sodium thiosulfate is 1.2, weigh a certain amount of benzenesulfonic acid, dissolve in methyl ethyl ketone, and ultrasonically vibrate for 5 hours;

[0052] 3) Slowly pour the sodium thiosulfate solution in step 1 into the mixed solution in step 2, stir at a constant speed, and reflux at 80° C. for 4 hours;

[0053] 4) Add aniline to the product of step 3, and stir at a constant speed for 10 h;

[0054]5) In the product of step 4, pour the initiator, stir, stand, filter, and dry in vacuum to obtain the polyaniline / sulfur / graphene composite material;

[0055] Preparation and performance test of sulfur electrode; sulfur electr...

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Abstract

The invention relates to a method for preparing a polyaniline / sulfur / graphene composite material. The method comprises the following steps: taking graphene as a carrier, and enabling sodium thiosulfate to react with an organic acid, so that the sulfur particles are loaded to the surface of the graphene; and performing aniline polymerization encapsulation, thereby obtaining the polyaniline / sulfur / graphene composite material. The types of organic acids, the molar ratio of the organic acids to sodium thiosulfate, the types of organic solvents and the like are regulated, and the polyaniline / sulfur / graphene composite material which is fine in particles and uniform in encapsulation is obtained. When the composite material is used for the positive pole of a lithium sulfur battery, the composite material has high specific capacity and excellent cycle performance and has excellent application prospects 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 / graphene composite material. Background technique [0002] Lithium-sulfur batteries have the advantages of high specific capacity and low cost, and are considered to be a promising new generation of batteries. The key bottleneck of lithium-sulfur batteries lies in the development of high-performance sulfur cathode materials. Sulfur is a non-metallic material with poor conductivity; 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 fading and low sulfur utilization during cycling. Carbon materials with large specific surface area and high conductivity are widely used to support simple sulfur, and the prepared carbon / sulfur composites exhibit high specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/04H01M4/139H01M4/362H01M4/62H01M4/625Y02E60/10
Inventor 范美强位攀李婷杨秀茹陈达柴文详田光磊舒康颖
Owner CHINA JILIANG UNIV
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