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Lithium-sulfur battery based on functional carbon fiber cloth as positive electrode barrier layer

A carbon fiber cloth and lithium-sulfur battery technology, applied in the field of electrochemical batteries, can solve the problems of inconvenient large-scale production, defects in preparation and operation, complex preparation, etc., achieve significant value, good application prospects, and increase the effect of specific capacity

Active Publication Date: 2016-05-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above measures can reduce the impact of defects such as the shuttle effect on battery performance to a certain extent, but the preparation of the materials used is complicated, the process is complicated, and the cost is high, which cannot fundamentally solve the problem of polysulfide dissolution and shuttling. Handling defects, inconvenient for mass production

Method used

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  • Lithium-sulfur battery based on functional carbon fiber cloth as positive electrode barrier layer
  • Lithium-sulfur battery based on functional carbon fiber cloth as positive electrode barrier layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation method of sulfur-containing positive electrode:

[0029] Sulfur powder is a sulfur-containing active material, conductive carbon black (Super-P) is a conductive agent, and PVDF (5%) NMP solution is a binder, and are mixed at a mass ratio of 4:5:1. After the materials were mixed, they were placed on a magnetic stirrer and stirred at a medium speed for 12 h. After the stirring is completed, the obtained viscous slurry is coated on the aluminum foil of the current collector, and then dried in a vacuum oven at 60° C. for 12 hours, and weighed for later use.

[0030] Pretreatment of carbon fiber cloth:

[0031] The carbon fiber cloth was ultrasonically soaked and washed with 10% dilute nitric acid, deionized water and ethanol for 20 min, respectively. It was then dried in a vacuum oven at 50°C for 12 hours. Finally, the carbon fiber cloth was cleaned with a plasma cleaning machine. During the cleaning process, the working voltage was set to 700V, and the oxyge...

Embodiment 2

[0039] The pretreatment of the carbon fiber cloth barrier layer and the preparation method of the sulfur-containing positive electrode are the same as in Example 1.

[0040] Preparation of functional carbon fiber cloth barrier layer:

[0041] According to titanium hydroxide (Ti(OH) 4 ) and carbon fiber cloth at a mass ratio of 1:8 to weigh titanium hydroxide, mix titanium hydroxide and PVDF (5%) NMP solution at a mass ratio of 4:1, and stir for 5 hours at a medium speed. After the slurry reaches an appropriate viscosity, it is coated on carbon fiber cloth and dried in a vacuum oven at 40°C for 24 hours to obtain a functional carbon fiber cloth. Then the functional carbon fiber cloth was cut into 12mm discs, weighed and vacuum dried again.

[0042] When the battery is assembled, the battery without the functional carbon fiber cloth barrier layer without the sulfur-containing positive electrode and the battery without the functional carbon fiber cloth barrier layer with the su...

Embodiment 3

[0045] The pretreatment of the carbon fiber cloth barrier layer is consistent with Example 1.

[0046] Preparation method of sulfur-containing positive electrode:

[0047] Sulfur powder is a sulfur-containing active material, acetylene black is a conductive agent, and PVDF (5%) NMP solution is a binder, mixed at a mass ratio of 7:2:1. After the materials were mixed, they were placed on a magnetic stirrer and stirred at a medium speed for 12 h. After the stirring is completed, the obtained viscous slurry is coated on the aluminum foil of the current collector, and then dried in a vacuum oven at 60° C. for 12 hours, and weighed for later use.

[0048] Preparation of functional carbon fiber cloth barrier layer:

[0049] Cobalt tetroxide (Co 3 o 4 ) was ultrasonically dispersed in ethanol to obtain a suspension. And under vacuum filtration, compound tricobalt tetroxide and carbon fiber cloth at a mass ratio of 1:5, and dry in a vacuum oven at 60°C for 16 hours to obtain funct...

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Abstract

The invention relates to a lithium-sulfur battery based on a functional carbon fiber cloth as a positive electrode barrier layer, and belongs to the field of electrochemical batteries. The lithium-sulfur battery based on a functional carbon fiber cloth as a positive electrode barrier layer comprises a sulfur-containing active material positive electrode, a diaphragm, an electrolyte, a metal lithium negative electrode and a foam nickel current collector, and a barrier layer is arranged between the sulfur-containing active material positive electrode and the diaphragm; and the barrier layer is obtained through compounding one or more of metal oxide, metal, metal alloy or metal hydroxide on the surface of the carbon fiber cloth. The above functional substance having catalysis activity and adsorption ability or capable of improving the electrochemical functions of the battery is introduced with the help of the good conductive performance and the three dimensional structure of the carbon fiber cloth, so polysulfide can be effectively intercepted and adsorbed, a shuttle effect is inhibited, and the practical specific capacity and the cycle performances of the lithium-sulfur battery are substantially improved.

Description

technical field [0001] The invention relates to a lithium-sulfur battery based on functional carbon fiber cloth as a positive barrier layer, belonging to the field of electrochemical batteries. Background technique [0002] At present, the social economy is booming, the informatization process is deepening, and the mobile appliances, transportation, and chemical industries are constantly being updated and developed. The requirements for energy are increasing day by day. People's demand for efficient, stable, and high-energy clean energy is becoming more and more urgent. At present, lithium-sulfur batteries are valued by countries all over the world because of their large capacity, light weight, clean and environmentally friendly, and cheap and easy-to-obtain characteristics of the sulfur cathode. It provides a theoretical specific capacity of up to 1675mAh / g and a theoretical specific energy of up to 2600Wh / kg. An environmentally friendly and high-energy clean energy that wi...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/052H01M50/431H01M50/44H01M50/46
CPCH01M10/052H01M50/431H01M50/44H01M50/449Y02E60/10
Inventor 孙旺欧先国孙克宁王振华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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