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Graphene/polyaniline/sulfur composite material and preparation method thereof

A composite material and graphene technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low sulfur utilization rate and low capacity, and achieve the effects of environmental friendliness, high capacity, and alleviation of volume expansion.

Inactive Publication Date: 2014-03-26
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention uses polysulfide rubber as the basic material, which can be used as the positive electrode material of lithium-sulfur battery after the vulcanization reaction with sulfur directly. Although it has good cycle performance, the energy storage mechanism of this material is based on the breaking of sulfur-sulfur bonds and link, the utilization of sulfur is lower and therefore the capacity is lower

Method used

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  • Graphene/polyaniline/sulfur composite material and preparation method thereof
  • Graphene/polyaniline/sulfur composite material and preparation method thereof
  • Graphene/polyaniline/sulfur composite material and preparation method thereof

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Embodiment 1

[0028] A kind of with graphene oxide, aniline, hydrochloric acid, sodium thiosulfate, water is the concrete steps of raw material preparation graphene / polyaniline / sulfur composite material as follows:

[0029] (1) Take 0.1 g graphene oxide and disperse it in 100 g water to form a uniform graphene oxide solution;

[0030] (2) Take 0.1 g of aniline and dissolve it in 1.825 g of hydrochloric acid (35% concentration) to form an aniline salt solution, and add it to the graphene oxide solution in step (1);

[0031] (3) Weigh 6.2 g of sodium thiosulfate solid and dissolve it in 20 g of water to form a sodium thiosulfate solution, which is gradually added dropwise to the mixed solution in step (2) and stirred at room temperature at 70°C for 24 h;

[0032] (4) The dark green precipitate obtained in step (3) is separated, washed, and dried to obtain a graphene / polyaniline / sulfur composite material, and its scanning electron microscope (SEM) photo is shown in figure 1 , whose transmissi...

Embodiment 2

[0036] A kind of with graphene oxide, aniline, hydrochloric acid, sodium thiosulfate, water is the concrete steps of raw material preparation graphene / polyaniline / sulfur composite material as follows:

[0037] (1) Take 1 g of graphene oxide and disperse it in 100 g of water to form a uniform graphene oxide solution;

[0038] (2) Take 0.1 g of aniline and dissolve it in 1.825 g of hydrochloric acid (35% concentration) to form an aniline salt solution, and add it to the graphene oxide solution in step (1);

[0039] (3) Weigh 6.2 g of sodium thiosulfate solid and dissolve it in 20 g of water to form a sodium thiosulfate solution, which is gradually added dropwise to the mixed solution in step (2), and stirred at 70° C. for 24 h;

[0040] (4) The dark green precipitation obtained in step (3) is separated, washed, and dried to obtain a graphene / polyaniline / sulfur composite material, its scanning electron microscope (SEM) photo and transmission electron microscope (TEM) photo and em...

Embodiment 3

[0042] A kind of with graphene oxide, aniline, hydrochloric acid, sodium thiosulfate, water is the concrete steps of raw material preparation graphene / polyaniline / sulfur composite material as follows:

[0043](1) Take 0.1 g graphene oxide and disperse it in 100 g water to form a uniform graphene oxide solution;

[0044] (2) Measure 1 g of aniline and dissolve it in 1.825 g of hydrochloric acid (concentration is 35%) to form an aniline salt solution, and add it to the graphene oxide solution in step (1);

[0045] (3) Weigh 6.2 g of sodium thiosulfate solid and dissolve it in 20 g of water to form a sodium thiosulfate solution, which is gradually added dropwise to the mixed solution in step (2), and stirred at 70° C. for 24 h;

[0046] (4) The dark green precipitation obtained in step (3) is separated, washed, and dried to obtain a graphene / polyaniline / sulfur composite material, its scanning electron microscope (SEM) photo and transmission electron microscope (TEM) photo and emb...

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Abstract

The invention discloses a graphene / polyaniline / sulfur composite material characterized in that graphene oxide is reduced to graphene by aniline, meanwhile, the aniline is oxidized and polymerized to polyaniline, and sulfur particles produced by sodium thiosulfate and hydrochloric acid are evenly distributed on a graphene polyaniline conducting layer in a reaction process. The invention further discloses a preparation method of the graphene / polyaniline / sulfur composite material. The method comprises the steps as follows: firstly, dispersing the graphene oxide in water to form a uniform graphene oxide solution, then dissolving an aniline solution into the hydrochloric acid to form an aniline salt solution, and adding the aniline salt solution into the graphene oxide solution; dissolving a sodium thiosulfate solid into the water to form a sodium thiosulfate solution, dropwise adding the odium thiosulfate solution into a graphene oxide and aniline mixed solution, stirring the mixture at a certain temperature for a moment, and separating, washing and drying produced deep green precipitation to obtain the graphene / polyaniline / sulfur composite material. The method is low in energy consumption, simple to operate, good in controllability, high in yield and suitable for mass production.

Description

technical field [0001] The invention relates to the field of preparation of lithium-sulfur secondary battery materials, in particular to a graphene / polyaniline / sulfur composite material and a preparation method thereof. Background technique [0002] The rapid development of electric vehicles and mobile electronic devices urgently requires the development of batteries with higher energy density. As an emerging lithium-ion battery system, lithium-sulfur secondary batteries use metal lithium as the negative electrode and elemental sulfur as the positive electrode. Lithium-sulfur secondary batteries have two discharge platforms (approximately 2.4 V and 2.1 V), but the electrochemical reaction mechanism is relatively complicated, and there is no conclusion yet. The theoretical specific energy of lithium-sulfur secondary batteries can reach 2600 Wh / kg (the theoretical specific capacities of lithium and sulfur are 3860 mAh / g and 1675 mAh / g, respectively), which is much higher than...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/364H01M4/625H01M10/0525Y02E60/10
Inventor 张俊刘亚杜高辉
Owner ZHEJIANG NORMAL UNIVERSITY
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