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High-performance carbon-sulfur composite anode material and preparation method thereof

A technology of composite materials and carbon materials, applied in the field of high-performance sulfur-carbon composite materials and their preparation, can solve the problems of complex preparation and unfavorable large-scale preparation and application of carbon-sulfur cathode materials, and achieve simple preparation and facilitate large-scale preparation , the effect of easy-to-obtain materials

Active Publication Date: 2015-05-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of these carbon materials is relatively complicated, and the reagents and instruments used are various, and the methods used to load sulfur into carbon materials often produce toxic gases such as sulfur dioxide or require long-term high-temperature heat treatment, etc., making these methods unfavorable for high sulfur loading. Large-scale preparation and application of a large amount of carbon-sulfur cathode materials

Method used

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  • High-performance carbon-sulfur composite anode material and preparation method thereof
  • High-performance carbon-sulfur composite anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 20 mg each of graphene, carbon nanotubes, and Ketjen black, place them in 6 mL of NMP, and sonicate at room temperature for 1-2 hours. Weigh 540 mg of sublimed sulfur, place it in 50 mL of NMP, and sonicate in a water bath at 45° C. for 30 min until all the sulfur is dissolved. After mixing the carbon / NMP dispersion and the sulfur / NMP solution, gradually add 3 times the volume of NMP water under stirring to precipitate all the dissolved sulfur and load it on the surface of the carbon material in situ. The mixture after adding water was centrifuged or suction filtered to remove water and NMP, and dried in an oven at 50° C. for 12 hours to obtain a graphene-carbon nanotube-ketjen black / sulfur composite. Wherein the sulfur content is about 90wt%.

[0021] Characterization of battery performance: Weigh the obtained composite material, conductive carbon black, and binder 108P according to the mass ratio of 8:1:1, prepare a uniform slurry with water as a solvent, and e...

Embodiment 2

[0039] Weigh 40mg of graphene, 20mg of carbon nanotubes, and 20mg of Ketjen Black in 8mL of NMP, and sonicate at room temperature for 1-2h. Another 720 mg of sublimed sulfur was weighed and placed in 50 mL of NMP in a water bath at 45° C. for 30 min until the sulfur was completely dissolved. After mixing the carbon / NMP dispersion and the sulfur / NMP solution, gradually add 3 times the volume of NMP water under stirring to precipitate all the dissolved sulfur and load it on the surface of the carbon material in situ. The mixture after adding water was centrifuged or suction filtered to remove water and NMP, and dried in an oven at 50° C. for 12 hours to obtain a carbon-sulfur complex.

[0040] The electrode sheet preparation and battery assembly are the same as in Example 1.

[0041] The battery was first activated for 2 cycles at a rate of 0.02C, and then charged and discharged at a rate of 0.1C. The charging and discharging voltage range is 1.8-2.8V. The first discharge cap...

Embodiment 3

[0043] Weigh 20mg of graphene, 40mg of carbon nanotubes, and 20mg of Ketjen Black in 8mL of NMP and sonicate at room temperature for 1-2h. Another 720 mg of sublimed sulfur was weighed and placed in 50 mL of NMP in a water bath at 45° C. for 30 min until the sulfur was completely dissolved. After mixing the carbon / NMP dispersion and the sulfur / NMP solution, gradually add 3 times the volume of NMP water under stirring to precipitate all the dissolved sulfur and load it on the surface of the carbon material in situ. The mixture after adding water was centrifuged or suction filtered to remove water and NMP, and dried in an oven at 50° C. for 12 hours to obtain a carbon-sulfur complex.

[0044] The electrode sheet preparation and battery assembly are the same as in Example 1.

[0045] The battery was first activated for 2 cycles at a rate of 0.02C, and then charged and discharged at a rate of 0.1C. The charging and discharging voltage range is 1.8-2.8V. The first discharge capa...

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Abstract

The invention provides a high-performance carbon-sulfur composite anode material applied to lithium sulfur batteries and a preparation method thereof. The carbon-sulfur composite material is composited with carbon materials of different shapes and elemental sulfur, wherein the carbon materials include one or more of unmodified or chemically modified linear carbon material, planar carbon material and point-like carbon material. The preparation method of the composite material comprises the following steps: dissolving or dispersing elemental sulfur and carbon materials in an organic solvent to form a liquid or colloidal dispersion, then, adding water into the dispersion formed by sulfur, carbon and an organic solvent so as to prompt separation of sulfur crystals, loading the crystals to the carbon material in situ, and finally, obtaining the carbon-sulfur composite anode material after centrifugation or filtration. The carbon-sulfur composite anode material prepared by the method of the invention has uniform sulfur distribution and high loading capacity, displays high specific capacity when being used for lithium-sulfur batteries, has high rate capability and good cycling stability.

Description

technical field [0001] The invention belongs to the field of electrochemical batteries, and relates to a high-performance sulfur-carbon composite material and a preparation method thereof, in particular to a simple and quick preparation of a high-performance carbon-sulfur composite cathode material based on the chemical properties of sulfur and carbon solutions. Background technique [0002] As a promising lithium battery, lithium-sulfur batteries have a very high theoretical specific capacity (1,672 mA h g -1 ), and the advantages of sulfur reserves and environmental friendliness have attracted much attention in recent years. Due to the electronic insulation of sulfur (~10 -30 S cm -1 ), the preparation of sulfur cathode materials often needs to be compounded with conductive materials. Carbon materials are often used as sulfur carriers to prepare sulfur-carbon composite cathode materials. The loading of sulfur in the sulfur-carbon composites currently reported is low, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/36
CPCH01M4/362H01M4/366H01M10/052Y02E60/10
Inventor 郭玉国杜文城殷雅侠万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI