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Preparation method and application of composite conductive polymer-coated elemental sulfur

A composite conductive and elemental sulfur technology, applied in the field of electrochemical energy storage, can solve the problems of poor solubility, easy introduction of impurities, and many operating steps, and achieve the effect of reducing swelling, reducing shuttle effect, and simple operation

Active Publication Date: 2017-11-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the rigidity of the chain and the strong interaction between the chains, the polypyrrole and polyaniline prepared separately have the disadvantages of poor solubility and difficult processing; at the same time, the polyaniline and polypyrrole film structure will occur during the battery cycle charge and discharge. damage, resulting in a decrease in efficiency
The conductive polymer synthesis methods used in patents CN104638236A and CN 103259000A are both the chemical oxidation process of monomer polymerization initiated by an initiator. The conductive polymer is first prepared and then compounded with elemental sulfur in other ways. This method has many operating steps and is easy to introduce Impurities and other shortcomings, and can not ensure the uniform compounding and adsorption of elemental sulfur, which limits the large-scale development of this method

Method used

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  • Preparation method and application of composite conductive polymer-coated elemental sulfur
  • Preparation method and application of composite conductive polymer-coated elemental sulfur

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Experimental program
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Effect test

Embodiment 1

[0029] The preparation method of composite conductive polymer coating elemental sulfur comprises the following steps:

[0030] (1) Preparation of solution A: dissolve 0.05mol / L pyrrole monomer and 1wt% sodium dodecylbenzenesulfonate into sulfuric acid, adjust the pH of the solution to 1 to obtain solution A;

[0031] (2) Preparation of suspension solution B: the monomers are added to the sulfuric acid solution according to the molar ratio of pyrrole: aniline = 1:5, and the thiophene monomer with a molar ratio of 3%, and the solubility of the three monomers is controlled to be 0.1mol / L; then add 5% dopant sodium dodecylbenzene sulfonate of polymer monomer total amount, 3% emulsifier polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer and 30 % of sublimated sulfur, the pH of the control solution is 4.5; finally the solution is sanded with a sand mill, and the particle size D50 of the control solution is 50nm; the suspension solution B is obtained;

...

Embodiment 2

[0036] The preparation method of composite conductive polymer coating elemental sulfur comprises the following steps:

[0037] (1) Preparation of solution A: dissolve 0.15mol / L pyrrole monomer and 2wt% sodium lauryl sulfate into oxalic acid, adjust the pH of the solution to 3 to obtain solution A;

[0038] (2) Preparation of suspension solution B: the monomers are added to the oxalic acid solution according to the molar ratio of pyrrole: aniline = 1:3, and the thiophene monomer with a molar ratio of 3%, and the solubility of the three monomers is controlled to be 0.3mol / L; then add 6% dopant sodium lauryl sulfate, 4% emulsifier polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer of the total amount of polymer monomer And 50% high-purity sulfur, the pH of the control solution is 5; finally the solution is sanded with a sand mill, and the particle size D50 of the control solution is 80nm; the suspension solution B is obtained;

[0039] (3) Aluminum foi...

Embodiment 3

[0043] The preparation method of composite conductive polymer coating elemental sulfur comprises the following steps:

[0044] (1) Preparation of solution A: 0.25mol / L pyrrole monomer and 3wt% sodium naphthalenesulfonate were dissolved in p-toluenesulfonic acid, and solution A was obtained after adjusting the pH of the solution to 5;

[0045] (2) Preparation of suspension solution B: the monomers are added to the salicylic acid solution according to the molar ratio of pyrrole:aniline=3:1, and the thiophene monomer of 2% molar ratio, and the solubility of the three monomers is controlled to be 0.5mol / L; then add 7% dopant sodium naphthalenesulfonate and 3% emulsifier polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer and 80% sublimated sulfur, the pH of the solution is controlled to be 5.5; finally, the solution is sanded with a sand mill, and the particle size D50 of the solution is controlled to be 100nm; the suspension solution B is obtained;

[00...

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Abstract

The invention discloses a preparation method for a composite conductive polymer coated with elemental sulfur and applications, and belongs to the electrochemical energy storage field. Concretely, a suspension containing pyrrole, aniline and thiophene monomers and elemental sulfur is employed as a supporting electrolyte, a platinum electrode is employed as an auxiliary electrode, aluminum foil is employed as a working electrode, a saturated calomel electrode is employed as a reference electrode, electrochemical parameters are adjusted, and polymerization of conductive polymer monomers is controlled while aggregation of elemental sulfur can be controlled synchronously. A polypyrrole / polyaniline / polythiophene composite conductive polymer film coated with elemental sulfur can be formed on the surface of the aluminum foil, and elemental sulfur can be bonded with polythiophene through S-S bonds. The composite conductive polymer film coated with elemental sulfur can be used as a positive pole piece of a lithium-sulfur battery directly, and the aluminum foil is employed as a positive pole current collector. The technology omits a combination process of elemental sulfur and a conductive polymer, and omits a later preparation process of introducing bonding agents during the pole piece preparation process. Operation is simple, and the swelling problem of a positive pole of a lithium-sulfur battery can be solved effectively.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, in particular to a preparation method and application of composite conductive polymer-coated elemental sulfur. Background technique [0002] In recent years, the rapid development of electronic products has led to the development of electrochemical power sources in the direction of light weight, small size, and long life; at the same time, under the pressure of environment and energy security, new energy vehicles began to develop rapidly in 2014, developing a kind of energy Power batteries with high density, high safety and long life have also become the ultimate goal pursued by major car companies. As the currently commonly used lithium-ion batteries are far from meeting the actual needs, lithium-sulfur batteries have gradually entered the field of vision of researchers. Elemental sulfur has a theoretical specific capacity of 1675mAh / g, and its theoretical energy density can reach 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/366H01M10/0525Y02E60/10
Inventor 汪涛曹勇王启岁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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