Sulfur composite cathode material and preparation method thereof

A composite positive electrode material and positive electrode material technology, applied in the field of sulfur composite positive electrode material and its preparation, can solve problems that are not conducive to battery performance and single structure, and achieve the effects of inhibiting the shuttle effect, preventing agglomeration, and improving cycle performance

Active Publication Date: 2013-03-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the carbon materials or conductive polymers currently published and reported as active material carriers for lithium-sulfur batteries are mostly single structures, such as carbon tubes with a one-dimensi

Method used

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  • Sulfur composite cathode material and preparation method thereof
  • Sulfur composite cathode material and preparation method thereof
  • Sulfur composite cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A preparation method of sulfur composite cathode material, said method comprising the following steps:

[0044] (1) Mix 4g of high-purity S powder (purity 99.5%, 325 mesh) with 1g of multi-walled carbon nanotubes, ball mill for 3 hours, place in a sealed polytetrafluoroethylene container filled with argon protection, and heat at 155°C Under heating for 24 hours, the sulfur-carbon nanotube composite material was obtained.

[0045] (2) Take 1 g of the sulfur-carbon nanotube composite material and ultrasonically disperse it in the alcohol / water liquid phase system for 1 hour to obtain a uniform black solution; the alcohol / water liquid phase system is ethanol / water (volume ratio 1:1), The total volume is 100ml;

[0046] (3) Add 50ml of graphene oxide solution with a concentration of 3mg / ml to the obtained solution, stir magnetically for 30min, and disperse in 150W ultrasonic for 1h to obtain a mixture;

[0047] (4) Put the mixture in an open container, stir and heat in an...

Embodiment 2

[0051] A preparation method of sulfur composite cathode material, said method comprising the following steps:

[0052] (1) Mix 4g of high-purity S powder (purity: 99.5%, 325 mesh) with 1g of multi-walled carbon nanotubes, ball mill for 3 hours, and place in a sealed polytetrafluoroethylene container filled with nitrogen protection, at 120°C Heated for 12 hours to obtain a sulfur-carbon nanotube composite material.

[0053] (2) Take 1 g of the sulfur-carbon nanotube composite material and ultrasonically disperse it in the alcohol / water liquid phase system for 1 hour to obtain a uniform black solution; the alcohol / water liquid phase system is methanol / water (volume ratio 1:2), The total volume is 100ml;

[0054] (3) Add 50ml of graphene oxide solution with a concentration of 1mg / ml to the obtained solution, stir magnetically for 30min, and disperse in 300W ultrasonic for 0.5h to obtain a mixture;

[0055] (4) Put the mixture in an open container, stir and heat in an oil bath, ...

Embodiment 3

[0060] (1) Mix 3g of high-purity S powder (purity 99.5%, 325 mesh) with 1g of single-walled carbon nanotubes, ball mill for 3 hours, and place in a sealed polytetrafluoroethylene container filled with nitrogen protection, at 155°C After heating for 24 hours, the sulfur-carbon nanotube composite material was obtained.

[0061] (2) Take 1g of sulfur-carbon nanotube composite material and ultrasonically disperse it in an alcohol / water liquid phase system for 1 hour to obtain a uniform black solution; the alcohol / water liquid phase system is propanol / water (volume ratio 2:1) , with a total volume of 100ml;

[0062] (3) Add 50ml of graphene oxide solution with a concentration of 3mg / ml to the obtained solution, stir it magnetically for 2 hours, and disperse it in 50W ultrasonic for 2 hours to obtain a mixture;

[0063] (4) Put the mixture in an open container, stir and heat in an oven, the heating temperature is 60°C, and the heating time is 72h, during which the water volatilized...

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Abstract

The invention relates to a sulfur composite cathode material and a preparation method thereof, which belongs to the field of chemical energy storage batteries. The sulfur composite cathode material is composed of graphene, elemental sulfur and a carbon nanotube. The invention also provides a preparation method of the sulfur composite cathode material, which comprises the following steps: after carrying out mixed ball-milling on the sulfur and the carbon nanotube, heating the obtained object under the protection of inert gas so as to obtain a sulfur-carbon nanotube composite material; then, carrying out ultrasonic dispersion on the sulfur-carbon nanotube composite material in an alcohol/water liquid phase system, and adding an oxidized graphene solution; and carrying out stirring, ultrasonic dispersing, stirred heating, filtering and drying on the obtained product so as to obtain the sulfur composite cathode material disclosed by the invention. The cathode material is good in cycle performance and discharge capacity, effectively improves the electrochemical electrical conductivity of sulfur, and improves the cycle performance of lithium sulfur batteries.

Description

technical field [0001] The invention relates to a sulfur composite cathode material and a preparation method thereof, belonging to the field of chemical energy storage batteries. Background technique [0002] 80Wh kg from Ni-MH battery (Ni / MH) -1 150Wh kg to lithium ion battery (LIB) -1 , and then to the current lithium-ion polymer battery (LPB) 180Wh·kg -1 In recent years, people have continuously refreshed the record of battery energy density. However, the current level of energy density of secondary batteries still cannot meet the needs of various electronic products that are developing rapidly. [0003] Sulfur has the electrochemical ability of multi-electron reduction reaction (e=2vs.Li 2 S), and the relative atomic mass of sulfur is small (32g / mol), so elemental sulfur has a power of up to 1675mAh·g -1 The theoretical specific capacity, corresponding to the theoretical battery energy density of lithium-sulfur batteries can reach 2600W kg -1 , far larger than the ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 陈人杰赵腾吴锋李丽陈君政叶玉胜陈实
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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