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A kind of carbon fiber material with deposited sulfur element and its preparation method and application

A carbon fiber material and carbon fiber technology, applied in the field of battery materials, can solve the problems of inability to meet the application requirements of lithium-sulfur batteries, high cost, cumbersome steps, etc., and achieve the effects of improving charge-discharge cycle performance, improving cycle life, and simple preparation methods

Active Publication Date: 2021-03-26
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation methods of the above-mentioned materials are often complicated, the steps are cumbersome, and the cost is high, which cannot meet the actual application requirements of lithium-sulfur batteries.

Method used

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  • A kind of carbon fiber material with deposited sulfur element and its preparation method and application
  • A kind of carbon fiber material with deposited sulfur element and its preparation method and application
  • A kind of carbon fiber material with deposited sulfur element and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Cobalt oxide modified cotton-based carbon fiber preparation:

[0034] Weigh 5.0g of cotton fiber cloth, soak it in the cobalt chloride solution with a concentration of 1M for 10min, take it out and rinse it with deionized water. The cotton fiber cloth adsorbed with cobalt chloride was immersed in the sodium sulfide solution with a concentration of 1M for 10 minutes, then taken out and rinsed with deionized water. Repeat this process 5 times to obtain cobalt sulfide-modified cotton fiber cloth. Cobalt sulfide-modified cotton fiber cloth was dried in an oven at 80 °C for 10 h, and then placed in a tube furnace for carbonization treatment. The carbonization treatment temperature was 900 °C, the heating rate was 5 °C / min, and the atmosphere was argon. After the carbonization is completed, the cobalt oxide-modified cotton-based carbon fiber is obtained after naturally cooling to room temperature. figure 1 It can be seen that the prepared cobalt oxide-modified cotton-based ...

Embodiment 2

[0039] Weighed 0.4 g of the prepared cobalt oxide-modified cotton-based carbon fiber and placed it in a closed quartz tube, added 0.6 g of sulfur powder, and treated it at 155° C. for 5 hours to obtain the positive electrode material. Other conditions were the same as in Example 1.

[0040] The positive electrode material prepared above, separator and lithium sheet were assembled into a lithium-sulfur button battery, and the charge-discharge cycle performance test was carried out. When charging and discharging at a constant current of 0.2C (335.0mA / g), the specific capacity of the first discharge of the positive electrode reached 1100mAh / g , the capacity remained at 805mAh / g after 100 cycles.

Embodiment 3

[0042] Weighed 0.2 g of the prepared cobalt oxide-modified cotton-based carbon fiber and placed it in a closed quartz tube, added 0.8 g of sulfur powder, and treated it at 155° C. for 5 hours to obtain the positive electrode material. Other conditions were the same as in Example 1.

[0043] The positive electrode material prepared above, separator and lithium sheet were assembled into a lithium-sulfur button battery, and the charge-discharge cycle performance test was carried out. When charging and discharging at a constant current of 0.2C (335.0mA / g), the specific capacity of the first discharge of the positive electrode reached 790mAh / g , the capacity remained at 621mAh / g after 100 cycles.

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Abstract

The invention relates to a carbon fiber material with deposited elemental sulfur, a preparation method and application thereof, belonging to the field of battery materials. In the carbon fiber material with deposited elemental sulfur, the material consists of the carbon fibers modified with intertwined or / and interlaced cobalt oxide and the elemental sulfur deposited on the carbon fibers. The carbon fiber material with deposited sulfur element disclosed by the invention can be used as a lithium sulfur cathode material; the carbon fiber material with deposited sulfur element uses the three-dimensional carbon fibers modified by intertwined or interlaced cobalt oxide as a sulfur bundling material, and the three-dimensional carbon fiber network provides continuous electron transport channels;therefore, the carbon fiber material with deposited elemental sulfur has the characteristics of reducing the internal resistance of the battery and facilitating the electrochemical reaction, and can effectively improve the energy density and the cycle life of the battery; moreover, the cobalt oxide modification object has the binding ability to lithium persulfide, which can effectively reduce theloss of lithium polysulfide, thereby improving the energy density of the battery and improving the charge and discharge cycle performance; and the preparation method of the carbon fiber material withdeposited elemental sulfur is simple and the raw materials are cheap and easy to obtain.

Description

technical field [0001] The invention relates to a carbon fiber material for depositing elemental sulfur, a preparation method and application thereof, and belongs to the field of battery materials. Background technique [0002] With the development of human science and technology, the power and usage time of electrical appliances such as electric vehicles and portable electronic products continue to increase, but the energy density of current commercial lithium-ion batteries can no longer meet the requirements. Therefore, people are eager to find a new type of battery with high energy density, green, safe, and low cost to replace the currently used secondary battery. The theoretical specific capacity of elemental sulfur in lithium-sulfur batteries is as high as 1675mAh / g, and the theoretical specific energy is as high as 2600Wh / kg, and its energy density is 6 times the theoretical value of current lithium-ion batteries. In addition, elemental sulfur is a common by-product i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/62H01M4/625H01M10/052Y02E60/10
Inventor 唐炳涛任文臣张淑芬
Owner DALIAN UNIV OF TECH
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