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Preparation of a graphene-coated sulfur-intercalated ordered mesoporous carbon sphere composite and its application as a cathode material for lithium-sulfur batteries

A graphene-coated lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of severe capacity attenuation, shuttle effect, and inability to meet the requirements of high-performance batteries, and achieve electrochemical performance Excellent, simple and efficient preparation process

Active Publication Date: 2018-05-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the mesoporous carbon / sulfur composite cathode material still has a serious shuttle effect, and the capacity fades after many cycles, which cannot meet the requirements of high-performance batteries.

Method used

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  • Preparation of a graphene-coated sulfur-intercalated ordered mesoporous carbon sphere composite and its application as a cathode material for lithium-sulfur batteries
  • Preparation of a graphene-coated sulfur-intercalated ordered mesoporous carbon sphere composite and its application as a cathode material for lithium-sulfur batteries
  • Preparation of a graphene-coated sulfur-intercalated ordered mesoporous carbon sphere composite and its application as a cathode material for lithium-sulfur batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] First, add 5mL of concentrated sulfuric acid to 100mL of deionized water, heat to 38°C, add 4.0g of triblock copolymer F127 (polyoxyethylene-polyoxypropylene-polyoxyethylene), and after it is completely dissolved, add 2.0g of propane Triol and stirred for 2 hours, then added 8g of tetraethyl orthosilicate, continued to stir for 10 minutes, then stood at 38°C for 28 hours, reacted hydrothermally at 110°C in the reactor for 28 hours, filtered and washed, put it in an oven After drying at 115°C for 8 hours, the temperature was adjusted to 170°C for pre-carbonization for 5 hours to obtain a composite. Put the composite into a carbonization furnace and raise the temperature to 900°C at a rate of 2°C / min under the protection of a nitrogen atmosphere, stop heating after 3 hours of heat preservation and cool naturally, then soak in 15wt% hydrofluoric acid, and then wash, Drying and grinding yield ordered mesoporous carbon spheres.

[0045] Mix 1g of spherical ordered mesoporou...

Embodiment 2

[0056] First, add 2mL of concentrated sulfuric acid into 75mL of deionized water, heat to 36°C, add 2.0g of F127, after it is completely dissolved, add 2.0g of glycerol and stir for 1.5 hours, then add 6g of ethyl orthosilicate, continue Stir for 10 minutes, then stand at 36°C for 28 hours, hydrothermally crystallize in a reactor at 105°C for 26 hours, filter and wash, put in an oven and dry at 110°C for 7 hours, then adjust the temperature to 165°C for 4.5 hours to obtain Complex. Put the composite into a carbonization furnace and raise the temperature to 875°C at a rate of 2°C / min under the protection of a nitrogen atmosphere, stop heating after 2.5 hours of heat preservation and cool naturally, then soak with 15wt% hydrofluoric acid, and then wash, Drying and grinding yield ordered mesoporous carbon spheres.

[0057] Mix 1g of spherical ordered mesoporous carbon material with 1.5g of elemental sulfur, heat up to 800°C at a rate of 5°C / min under a vacuum of 10KPa, keep it w...

Embodiment 3

[0061] First, add 10mL of concentrated sulfuric acid to 125mL of deionized water, heat to 40°C, add 6.0g of F127, after it is completely dissolved, add 2.0g of glycerol and stir for 2.5 hours, then add 10g of ethyl orthosilicate, continue Stir for 10 minutes, then stand at 40°C for 28 hours, hydrothermally react in a reactor at 115°C for 30 hours, filter and wash, put in an oven and dry at 120°C for 9 hours, then adjust the temperature to 175°C for pre-carbonization for 5.5 hours to obtain a compound things. Put the compound into a carbonization furnace and raise the temperature to 975°C at a rate of 2°C / min under the protection of a nitrogen atmosphere, stop heating after 3.5 hours of heat preservation and cool naturally, then soak in 15wt% hydrofluoric acid, and then wash, Drying and grinding yield ordered mesoporous carbon spheres.

[0062] Mix 1g of spherical ordered mesoporous carbon material with 2.5g of elemental sulfur, heat up to 900°C at a rate of 5°C / min under a va...

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Abstract

The invention provides preparation of a graphene-coated sulfur-embedded ordered mesoporous carbon sphere composite material and an application of the ordered mesoporous carbon sphere composite material as a lithium-sulfur battery positive electrode material, and belongs to the technical field of lithium-sulfur battery positive electrode materials. With a triblock copolymer F127 (polyoxyethylene-olyoxypropylene-polyoxyethylene) as a structure-directing agent and a carbon source, tetraethoxysilane as a template agent and glycerol as the carbon source, ordered mesoporous carbon spheres are prepared through a one-step method; the prepared ordered mesoporous carbon spheres are mixed with elemental sulfur and then are heated in vacuum; the elemental sulfur is embedded into the ordered mesoporous carbon spheres to prepare the sulfur-embedded ordered mesoporous carbon sphere composite material; and graphene coats the surface of the sulfur-embedded ordered mesoporous carbon sphere composite material through surface electrostatic interaction to prepare the graphene-coated sulfur-embedded ordered mesoporous carbon sphere lithium-sulfur battery positive electrode material. According to the technical scheme provided by the invention, the lithium-sulfur battery positive electrode material with excellent electrochemical properties is prepared; and the lithium-sulfur battery positive electrode material has a good application prospect.

Description

technical field [0001] The invention relates to a preparation method of a graphene-coated sulfur-intercalated ordered mesoporous carbon sphere lithium-sulfur battery positive electrode material, in particular to a lithium-sulfur battery prepared by compounding ordered mesoporous carbon spheres, elemental sulfur and graphene The method for the cathode material belongs to the technical field of cathode materials for lithium-sulfur batteries. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices due to their high energy density, and are also used in electric vehicles and power station energy storage. However, there is very little room for improvement in the energy density of current lithium-ion batteries, and it is difficult to meet the growing demand for high-performance batteries in electronic products and electric vehicles. Therefore, it is necessary to develop high-capacity battery materials. Lithium-sulfur batteries are promisi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M10/052H01M2004/021Y02E60/10
Inventor 赵东林董惠张万欣李成丁泽文
Owner BEIJING UNIV OF CHEM TECH
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