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Preparation method for polyene/S composite positive electrode material of lithium-sulfur battery

A composite positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of application limitations, low battery capacity, etc., achieve low cost, solve capacity, and increase energy density Effect

Active Publication Date: 2019-05-03
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low capacity of traditional lithium-ion batteries, the application in the field of energy storage is limited, and it is urgent to develop a high-capacity battery system suitable for large-scale energy storage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Using melamine as a raw material, heat it in a muffle furnace at 400°C for 4 hours to prepare g-C 3 N 4 ,

[0032] (2) Get 5g of g-C prepared in step (1) 3 N 4 , placed in 45g deionized water, 500W ultrasonic stripping for 1h, to obtain two-dimensional g-C 3 N 4 solution;

[0033] (3) Get 1g graphene, be dispersed in the solution of step (2) gained, and add 0.1g sodium dodecylsulfonate, ultrasonic dispersion is uniform;

[0034] (4) drying the solution obtained in step (3) at 100° C. for 5 hours to obtain a polyene composite material;

[0035] (5) The polyene composite material obtained in step (4) is mixed with 1g NaOH, heated to 400° C. to make pores, and the average diameter of the pores obtained is 1 μm, and the porous polyene composite material with a porosity of 10% is used for deionization Wash with water and dry at 100°C;

[0036] (6) Melt the porous polyene composite material obtained in step (5) in a 100ml reactor at 150° C. for 1 h, and the amount...

Embodiment 2

[0039] (1) Using dicyandiamide as raw material, heat in a muffle furnace at 300°C for 5 hours to prepare g-C 3 N 4 ;

[0040] (2) Take 10g of g-C prepared in step (1) 3 N 4 , placed in 40g deionized water, and ultrasonically stripped at 1000W for 5h to obtain two-dimensional g-C 3 N 4 solution;

[0041] (3) Get 5g phosphorene, disperse it in the solution obtained in step (2), and add 1.5g sodium lauryl sulfate, and ultrasonically disperse evenly;

[0042] (4) drying the solution obtained in step (3) at 150°C for 10 hours to obtain a polyene composite material;

[0043] (5) Mix the polyene composite material obtained in step (4) with 10 mL of concentrated sulfuric acid, heat to 200° C. to form pores, the average pore diameter is 10 μm, and the porosity is 40%, so as to obtain a porous polyene composite material. Washed with deionized water and dried at 100°C,

[0044] (6) The porous polyene composite material obtained in step (5) is subjected to sulfur melting at 120° C. ...

Embodiment 3

[0047] (1) Using dicyandiamide as raw material, heat in a muffle furnace at 500°C for 3 hours to prepare g-C 3 N 4 ;

[0048] (2) Take 10g of g-C prepared in step (1) 3 N 4 , placed in 40g deionized water, and ultrasonically stripped at 1200W for 10h to obtain two-dimensional g-C 3 N 4 solution;

[0049] (3) Get 5g germanene, disperse in the solution obtained in step (2), and add 1.5g sodium petroleum sulfonate, and ultrasonically disperse evenly;

[0050] (4) drying the solution obtained in step (3) at 200° C. for 8 hours to obtain a polyene composite material;

[0051] (5) The polyene composite material obtained in step (4) and 15g KOH are heated to 350° C. to make pores, the average pore diameter is 100 μm, and the porosity is 80%, so as to obtain a porous polyene composite material, and use deionized water Washed and dried at 100°C,

[0052] (6) The porous polyene composite material obtained in step (5) was subjected to sulfur melting at 115° C. for 8 hours, and th...

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Abstract

A preparation method for a polyene / S composite positive electrode material of a lithium-sulfur battery comprises the following steps: preparing two-dimensional g-C3N4 solution, dispersing a graphene-like two-dimensional material and a surfactant into the two-dimensional g-C3N4 solution to obtain uniform solution, drying the uniform solution, carrying out activation pore-forming treatment, and carrying out sulfur melting to obtain the polyene / S composite positive electrode material for the lithium-sulfur battery. The method is simple to operate, is simple and easy to popularize, solves the shuttle effect problem of the lithium-sulfur battery by utilizing the strong adsorption effect of C3N4 on polysulfide, and remarkably improves the electrochemical performance of the material, wherein theporous polyene composite material of the intermediate product can adsorb sulfur several times more than that of the polyene composite material, thereby increasing the energy density of the positive electrode material. Therefore, the material provided by the invention is an ideal lithium-sulfur battery positive electrode material.

Description

Technical field: [0001] The invention belongs to the technical field of new energy, and in particular relates to a preparation method of a polyene / S composite cathode material for a lithium-sulfur battery. Background technique: [0002] As the depletion of non-renewable fossil fuels such as oil and natural gas has attracted increasing attention, air pollution and room temperature effects have become global problems. Solving energy problems and taking the road of low-carbon economy to achieve sustainable development has become the general consensus of all countries in the world. my country's response to global climate change and green and low-carbon development have become an important issue. For this reason, new energy vehicles have become the key direction of global economic development and have achieved rapid development, showing extremely broad application prospects. New energy vehicles mainly rely on secondary batteries to store energy. Secondary batteries can be repeat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 董伟杨森沈丁杨绍斌
Owner LIAONING TECHNICAL UNIVERSITY
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