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Sulfonated graphene-modified sulfur-carbon electrode and preparation and application thereof

A technology of sulfonated graphene and electrodes, which is applied in the field of preparation of sulfur-carbon electrodes, can solve the problems of increasing material preparation costs, complex preparation processes, and insignificant effects

Active Publication Date: 2016-06-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods of modifying and modifying carbon materials require complex preparation processes, which greatly increase the cost of material preparation, resulting in insignificant final effects.

Method used

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  • Sulfonated graphene-modified sulfur-carbon electrode and preparation and application thereof
  • Sulfonated graphene-modified sulfur-carbon electrode and preparation and application thereof
  • Sulfonated graphene-modified sulfur-carbon electrode and preparation and application thereof

Examples

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Embodiment 1

[0021] Take 2 g of sulfonated graphene with a carbon-sulfur element ratio of 6:1, immerse it in 100 ml of lithium hydroxide solution with a mass fraction of 30% for 24 hours, then wash, filter and dry the sulfonated graphene to obtain lithiated sulfonated graphene Graphene. The graphene was uniformly mixed with polytetrafluoroethylene emulsion and water with a mass fraction of 5%, and the specific ratio was 2g sulfonated graphene, 10g polytetrafluoroethylene emulsion and 30ml water. The mixed system is sprayed on the carbon-sulfur composite electrode. The carbon material used in the carbon-sulfur composite electrode is SuperP, the sulfur filling rate is 50%, and the sulfur loading is 2mg / cm 2 . After spraying, the loading of sulfonated graphene is 0.1mg / cm 2 . After the electrode modified by the sulfonated graphene was dried, it was assembled into a lithium-sulfur battery for battery testing. The test conditions are that the current density is 0.1 times, and the charge an...

Embodiment 2

[0023] Take 2 g of sulfonated graphene with a carbon-sulfur element ratio of 9:1, immerse it in 100 ml of lithium hydroxide solution with a mass fraction of 15% for 24 hours, then wash, filter and dry the sulfonated graphene to obtain lithiated sulfonate Graphene. The graphene is uniformly mixed with 5% polyvinylidene fluoride and N-N dimethylacetamide, and the specific ratio is 2g sulfonated graphene, 10g polyvinylidene fluoride solution and 20ml N-N dimethylacetamide. The mixed system is sprayed on the carbon-sulfur composite electrode. The carbon material used in the carbon-sulfur composite electrode is KB600, the sulfur filling rate is 50%, and the sulfur loading is 2mg / cm 2 . After spraying, the loading of sulfonated graphene is 0.1mg / cm 2 . After the electrode modified by the sulfonated graphene was dried, it was assembled into a lithium-sulfur battery for battery testing. The test conditions are that the current density is 0.1 times, and the charge and discharge ra...

Embodiment 3

[0025] Take 2g of sulfonated graphene with a carbon-sulfur element ratio of 8:1, immerse it in 100ml of lithium hydroxide solution with a mass fraction of 20% for 24h, then wash, filter and dry the sulfonated graphene to obtain lithiated sulfonated graphene Graphene. The graphene is uniformly mixed with 5% polyvinylidene fluoride and N-N dimethylacetamide, and the specific ratio is 2g sulfonated graphene, 10g polyvinylidene fluoride solution and 20ml N-N dimethylacetamide. The mixed system is sprayed on the carbon-sulfur composite electrode. The carbon material used in the carbon-sulfur composite electrode is KB600, the sulfur filling rate is 50%, and the sulfur loading is 2mg / cm 2 . After spraying, the loading of sulfonated graphene is 0.1mg / cm 2 . After the electrode modified by the sulfonated graphene was dried, it was assembled into a lithium-sulfur battery for battery testing. The test conditions are that the current density is 0.1 times, and the charge and discharge...

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Abstract

The invention relates to a sulfonated graphene-modified sulfur-carbon electrode. A preparation method of the sulfonated graphene-modified sulfur-carbon electrode comprises the following steps: dipping sulfonated graphene into a lithium hydroxide solution and then taking out, washing and drying the sulfonated graphene to obtain lithiated sulfonated graphene; dispersing the lithiated sulfonated graphene and a binder into a dispersant; and spraying the dispersant on a sulfur-carbon composite electrode in a spraying manner and then carrying out drying to obtain the sulfonated graphene-modified sulfur-carbon electrode. The lithiated sulfonated graphene is tightly adsorbed to the electrode through the van der Waals force between graphene layers, so that dissolution of polysulfide in the sulfur-carbon electrode can be reduced; and meanwhile, the lithiated sulfate radical has the effect of conducting lithium ions, so that the method can effectively improve the cycle performance of the lithium-sulfur battery; and meanwhile, the method is simple in process and short in processing time, and hopefully achieves large-scale application in the field of the lithium-sulfur battery.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to the preparation and application of a sulfur-carbon electrode modified by sulfonated graphene. Background technique [0002] Lithium-sulfur batteries have an ultra-high theoretical energy density of up to 2600Wh / kg, and use lower-cost sulfur and carbon as cathode materials, which has attracted widespread attention and has attracted more and more attention from researchers. Representative manufacturers of global lithium-sulfur battery research include SionPower of the United States, Oxis of the United Kingdom, and SumSang of South Korea, etc., and the energy density of batteries that can be developed is not less than 400Wh / kg. However, there is still a long way to go before the large-scale commercial application of lithium-sulfur batteries can be truly realized. At present, the main reason for limiting the commercialization of lithium-sulfur batteries is that the ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/133H01M4/139H01M4/1393H01M4/62H01M10/0525
CPCY02E60/10
Inventor 张华民周伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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