Graphene/polyaniline/sulfur composite cathode material and preparation method thereof, lithium sulfur battery

A composite positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor stability, poor performance stability of lithium-sulfur batteries, structural stability and low conductivity, etc., to achieve excellent electrical conductivity High performance, guaranteed cycle stability and rate performance, low price effect

Active Publication Date: 2016-03-30
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a graphene / polyaniline / sulfur composite positive electrode material and its preparation method, to solve the technical problems of the existing lithium-sulfur positive electrode material structural stability and low conductivity
[0007] Another object of the present invention is to provide a lithium-sulfur battery positive electrode and a lithium-sulfur battery to solve the technical problems of poor structural stability of the existing lithium-sulfur battery positive electrode and poor performance stability in the lithium-sulfur battery cycle charge and discharge process

Method used

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  • Graphene/polyaniline/sulfur composite cathode material and preparation method thereof, lithium sulfur battery
  • Graphene/polyaniline/sulfur composite cathode material and preparation method thereof, lithium sulfur battery
  • Graphene/polyaniline/sulfur composite cathode material and preparation method thereof, lithium sulfur battery

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preparation example Construction

[0031]On the other hand, the example of the present invention provides a simple and efficient method for preparing a structurally stable graphene / aniline / sulfur composite positive electrode material. Please refer to the technical process of the graphene / aniline / sulfur composite cathode material method figure 1 , which includes the following steps:

[0032] Step S01. Preparation of polyaniline / sulfur nanoparticles:

[0033] adding polyaniline and sulfur into a solvent for mixing treatment, and then removing the solvent to obtain polyaniline-supported sulfur composite particles;

[0034] Step S02. wrapping the nanoparticles with graphene oxide:

[0035] The polyaniline-supported sulfur composite particles and graphene oxide are formulated into a mixed solution of water;

[0036] Step S03. Carry out hydrothermal reaction to the aqueous solution of polyaniline / sulfur nanoparticles and graphite oxide mixed homogeneously:

[0037] The mixed solution is subjected to hydrothermal ...

Embodiment 1

[0068] The above-mentioned graphene / polyaniline / sulfur composite cathode material and a preparation method thereof. The graphene / polyaniline / sulfur composite cathode material is prepared by the following method:

[0069] S11. Preparation of polyaniline / sulfur nanoparticles:

[0070] The columnar polyaniline / sulfur nanoparticles were prepared by first emulsification-post-polymerization, the specific method is as follows:

[0071]Dissolve 0.3g of polyvinylpyrrolidone in 20mL of hydrochloric acid solution, dissolve 200 microliters of aniline and 0.3g of sulfur element in 2mL of carbon disulfide solution, mix the two solutions together, and stir for 1 hour at a speed of 1000 rpm to fully emulsify step. Then add 1 mL of an aqueous solution in which 0.45 g of ammonium persulfate is dissolved to initiate a polymerization reaction. After stirring for 5 hours, the carbon disulfide solution is slowly evaporated at room temperature. The stirring time is 6 hours, and then the remaining ...

Embodiment 2

[0077] The above-mentioned graphene / polyaniline / sulfur composite cathode material and a preparation method thereof. The graphene / polyaniline / sulfur composite cathode material is prepared by the following method:

[0078] S21. Preparation of polyaniline / sulfur nanoparticles:

[0079] The columnar polyaniline / sulfur nanoparticles were prepared by first emulsification-post-polymerization, the specific method is as follows:

[0080] 0.5g of polyvinylpyrrolidone was dissolved in 30mL of hydrochloric acid solution, 300 microliters of aniline solution and 0.3g of sulfur element were dissolved in 3mL of carbon disulfide solution, the two solutions were mixed together, and stirred for 2 hours at a speed of 1000 rpm, fully Carry out the emulsification step. Then add 1.5mL of aqueous solution with 0.55g of ammonium persulfate dissolved therein to initiate the polymerization reaction. After fully stirring for 6 hours, the carbon disulfide solution is slowly evaporated at room temperatur...

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Abstract

The invention provides a graphene/polyaniline/sulfur composite material and a preparation method thereof, a lithium sulfur battery cathode and a lithium sulfur battery. The graphene/polyaniline/sulfur composite material takes polyaniline/sulfur nano-particles as base bodies and packages and reduces graphene nanosheets in situ. The graphene/polyaniline/sulfur composite cathode material preparation method comprises preparing polyaniline/sulfur nano-particles, carrying out oxidation grapheme package to the polyaniline/sulfur nano-particles, carrying out water heat treatment to the packaged material. The lithium sulfur battery cathode and the lithium sulfur battery all contain the graphene packaged polyaniline/sulfur composite cathode material which endows good cycle performance and rate capability to the lithium sulfur battery. The graphene/polyaniline/sulfur composite cathode material has excellent conductivity and structure stability, is simple in preparation method and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and specifically relates to a graphene / polyaniline / sulfur composite material and a preparation method thereof, a positive electrode of a lithium-sulfur battery containing the graphene / polyaniline / sulfur composite material, and a lithium-sulfur battery. Background technique [0002] Lithium-sulfur battery is a high-energy-density secondary lithium-ion battery with great development potential. Its positive electrode material, elemental sulfur, has a large specific capacity (1675mAhg -1 ), low cost, and environmental friendliness. At present, due to the attention paid to the research of high-energy batteries, coupled with the rapid development of materials, chemistry and nanotechnology, lithium-sulfur batteries have achieved unprecedented development in terms of battery structure and electrode materials, and thus receive more and more attention. attention, and is expected to replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/60H01M4/38H01M10/0525
CPCH01M4/366H01M4/38H01M4/583H01M4/602H01M4/625H01M10/0525Y02E60/10
Inventor 唐永炳李文跃李振声
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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