Lightweight flexible sulfur electrode, and preparation method and application thereof

A sulfur electrode and flexible technology, applied in the field of new batteries, can solve the problems of non-lightweight, highly flexible, thin-film and highly active electrodes, carbon materials with insignificant catalytic effect, and adsorption of polysulfides, etc., to improve the conversion reaction Speed, improve electrochemical performance, improve the effect of interfacial binding force

Inactive Publication Date: 2019-05-03
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor chemical binding force between polar carbon materials and non-polar polysulfides, polysulfides are often not well adsorbed.
In addition, the catalytic effect of carbon materials on discharge products is not significant, so that a high overpotential still needs to exist during the charging process.
The current conventional electrode structure design (sulphur/carbon...

Method used

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  • Lightweight flexible sulfur electrode, and preparation method and application thereof
  • Lightweight flexible sulfur electrode, and preparation method and application thereof
  • Lightweight flexible sulfur electrode, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A certain area (3cm × 3cm) of carbon nanotube film is immersed in the bath, the plating solution is 25mg / mL copper pyrophosphate solution, which contains 5mg / mL complexing agent potassium pyrophosphate and 1mg / mL auxiliary complexing agent citric acid , the pH of the plating solution is about 8.5; at a temperature of 40°C and a current density of 1.7mA / cm 2Plating for 10min under the condition of the above, and then take out the film and wash it with deionized water to obtain a copper-plated carbon nanotube film.

[0035] Weigh sublimated sulfur, acetylene black and sodium carboxymethylcellulose respectively according to the mass ratio of 8:1:1, and obtain uniformly dispersed powder by stirring, and adjust the solid content of the slurry by adding deionized water (solid content control within 30%), then the slurry is coated with the surface of the carbon nanotube film after copper plating, and placed in a 65°C oven to bake for 12h, finally obtaining a composite of sulfu...

Embodiment 2

[0038] A certain area (3cm × 3cm) of carbon nanotube film is immersed in the bath, the plating solution is 25mg / mL copper pyrophosphate solution, which contains 5mg / mL complexing agent potassium pyrophosphate and 1mg / mL auxiliary complexing agent citric acid , the pH of the plating solution is about 8.5; at a temperature of 40°C and a current density of 1.7mA / cm 2 Plating for 10min under the condition of the above, and then take out the film and wash it with deionized water to obtain a copper-plated carbon nanotube film.

[0039] Weigh sublimated sulfur, acetylene black and sodium carboxymethylcellulose respectively according to the mass ratio of 8:1:1, and obtain uniformly dispersed powder by stirring, and adjust the solid content of the slurry by adding deionized water (solid content control within 30%), then the slurry is coated with the surface of the carbon nanotube film after copper plating, and placed in a 65°C oven to bake for 12h, finally obtaining a composite of sulf...

Embodiment 3

[0042] The graphene thin film of certain area (3cm * 3cm) is immersed in the bath, and plating bath is 25mg / mL copper pyrophosphate solution, wherein contains 5mg / mL complexing agent potassium pyrophosphate and 1mg / mL auxiliary complexing agent citric acid, The pH of the bath is about 8.5. At a temperature of 40°C and a current density of 1.8mA / cm 2 Plating under the conditions of 10min, and then remove the film and rinse with deionized water.

[0043] Weigh sublimated sulfur, acetylene black and sodium carboxymethylcellulose respectively according to the mass ratio of 8:1:1, and obtain uniformly dispersed powder by stirring, and adjust the solid content of the slurry by adding deionized water (solid content control within 30%), then the slurry is coated with the surface of the copper-plated graphene film, and placed in a 65°C oven to bake for 12h to finally obtain a composite sulfur positive electrode of sulfur carbon / copper sulfide / copper-graphene film .

[0044] The obta...

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Abstract

The invention belongs to the technical field of novel batteries and in particular relates to a flexible sulfur electrode, a preparation method thereof and the application thereof in a metal (lithium/magnesium) sulfur battery. The invention provides a flexible sulfur electrode comprising elementary sulfur, conductive carbon black, copper sulfide CuSx (1/2<=x<=1) and a copper-carbon flexible film, wherein the elementary sulfur and the conductive carbon black are applied to the copper-carbon flexible film, and CuSx is generated in situ during a baking process. The preparation method of the flexible composite sulfur positive electrode of the invention is simple in process and easy to implement, provides a new idea for the preparation of a lightweight and highly-flexible metal (lithium/magnesium) sulfur battery, and is expected to be applied to a flexible metal (lithium/magnesium) sulfur battery in a large scale.

Description

technical field [0001] The invention belongs to the technical field of novel batteries, and in particular relates to a flexible sulfur positive electrode, a preparation method thereof and its application in metal (lithium / magnesium) sulfur batteries. Background technique [0002] With the rapid development of science and technology, the technical requirements for batteries in the fields of energy storage, aerospace and electric vehicles are getting higher and higher, and there is an urgent need for new chemical energy storage systems with high energy density, long cycle life, low cost and high safety. . The current commonly used lithium-ion batteries (limited by the capacity of the positive and negative electrode materials) can no longer meet the needs of the market. Therefore, it is of great significance to develop a battery system with high energy density, long cycle life, no pollution to the environment, and high safety. . In addition, with the continuous emergence of f...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/36H01M4/38H01M4/62H01M4/13H01M4/139H01M10/052H01M10/054
CPCY02E60/10
Inventor 李永张亚莉俞梦裴海娟刘雯郭瑞解晶莹王勇杨丞
Owner SHANGHAI INST OF SPACE POWER SOURCES
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