Sandwich-structure sulfur-graphene-conductive polymer composite material, preparation and application

A technology of conductive polymers and composite materials, applied in structural parts, circuits, electrical components, etc., can solve problems such as unfavorable carbon coating and sulfur volatilization, and achieve the effects of short preparation cycle, simple preparation process and excellent product performance

Inactive Publication Date: 2014-09-03
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating process usually involves high temperature treatment, and sulfur will volatilize at high temperature, which is not conducive to the carbon coating.

Method used

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  • Sandwich-structure sulfur-graphene-conductive polymer composite material, preparation and application
  • Sandwich-structure sulfur-graphene-conductive polymer composite material, preparation and application
  • Sandwich-structure sulfur-graphene-conductive polymer composite material, preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Elemental sulfur and graphite oxide are mixed by high-energy ball milling at a mass ratio of 9:1 to reduce the size of sulfur particles and evenly disperse them around the graphite oxide lamellar structure; place the sulfur / graphite oxide mixture in a microwave reaction furnace for 150 Under the temperature of ℃, heat treatment for 60min, the elemental sulfur melts rapidly, and the graphite oxide is reduced to graphene by microwave heat at the same time; the surface of the sulfur / graphene composite material is evenly coated with a layer of conductive polymer by gas phase polymerization, and pyrrole is used as the polymer unit body, ferric chloride is the oxidant, the sulfur / graphene composite material is dispersed in the oxidant solution with a concentration of 0.5mol / L, taken out after drying, and placed in a vacuum glass desiccator equipped with pyrrole monomer at the bottom, The polymerization reaction was carried out at a temperature of 25°C for 60 minutes to prepare...

Embodiment 2

[0025] Elemental sulfur and graphite oxide are mixed by high-energy ball milling at a mass ratio of 8:2 to reduce the size of sulfur particles and evenly disperse them around the graphite oxide lamellar structure; place the sulfur / graphite oxide mixture in a microwave reaction furnace for 200 Under the temperature of ℃, heat treatment for 30 minutes, the elemental sulfur melted rapidly, and the graphite oxide was reduced to graphene by microwave heat at the same time; the surface of the sulfur / graphene composite material was evenly coated with a layer of conductive polymer by gas phase polymerization, and pyrrole was used as the polymer unit body, ferric chloride is the oxidant, and the sulfur / graphene composite material is dispersed in the oxidant solution with a concentration of 1.5mol / L, taken out after drying, and placed in a vacuum glass desiccator equipped with pyrrole monomer at the bottom, Polymerize at 35° C. for 30 minutes to prepare a sulfur / graphene / conductive polym...

Embodiment 3

[0027] Elemental sulfur and graphite oxide are mixed by high-energy ball milling at a mass ratio of 7:3 to reduce the size of sulfur particles and evenly disperse them around the graphite oxide lamellar structure; place the sulfur / graphite oxide mixture in a microwave reaction furnace at 250 Under the temperature of ℃, heat treatment for 20 minutes, the elemental sulfur melted rapidly, and the graphite oxide was reduced to graphene by microwave heat at the same time; the surface of the sulfur / graphene composite material was uniformly coated with a layer of conductive polymer by gas phase polymerization, and pyrrole was used as the polymer unit body, ferric chloride is the oxidant, and the sulfur / graphene composite material is dispersed in the oxidant solution with a concentration of 3.0mol / L, taken out after drying, and placed in a vacuum glass desiccator equipped with pyrrole monomer at the bottom, Polymerize at 45° C. for 20 minutes to prepare a sulfur / graphene / conductive pol...

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Abstract

The invention relates to a sandwich-structure sulfur-graphene-conductive polymer composite material, preparation and application. The preparation method comprises: taking elemental sulfur and graphite oxide as raw materials, performing high-energy ball-milling mixing dispersing according to a certain ratio, processing by employing a special heat processing method, so as to obtain a graphene / sulfur composite material, and then uniformly cladding a layer of a conducting polymer on the surface of the composite material by employing a gas-phase polymerization method, so as to form the sulfur-graphene-conductive polymer sandwich structure. Compared with conventional preparation methods for sulfur composite materials, the method has the characteristics of simple preparation technology, short preparation period, excellent product performances and the like.

Description

technical field [0001] The invention relates to a preparation method in the technical field of lithium-sulfur batteries, in particular to a sandwich structure sulfur / graphene / conductive polymer composite material and its preparation and application. Background technique [0002] As a battery system with high capacity, high energy density and low cost, lithium-sulfur battery has received great attention and attention. Representative manufacturers of lithium-sulfur battery research in the world, such as Sion Power in the United States, Oxis in the United Kingdom, and SumSang in South Korea, are all competing to develop lithium-sulfur batteries, and the energy density of the developed batteries is not less than 500 Wh / kg. However, it is still facing great difficulties to achieve large-scale commercialization of lithium-sulfur batteries, mainly due to factors such as low sulfur loading, low conductivity of sulfur element, and shuttle effect caused by the dissolution of electroly...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/366H01M4/38H01M4/587H01M4/624H01M10/052Y02E60/10
Inventor 何丹农严鹏张春明王丹杨扬吴晓燕
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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