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Sulfur/carbon composite material and preparation method thereof

A technology of carbon composite materials and carbon materials, applied in the field of electrochemistry, can solve the problems of low sulfur content in composite materials, difficult to control, and low sulfur loading capacity, and achieve the effects of small particle size, low cost, and low impurity content

Active Publication Date: 2015-04-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particles of the sulfur / carbon composite prepared by this method are very tightly bound, but the sulfur loading is low
[0005] China Patent Network CN 101891930A discloses a method for preparing carbon nanotube sulfur-based composite positive electrode materials by a gas phase method. This method is beneficial to the dispersion of carbon nanotubes and the uniform distribution of sulfur, but the sulfur content in the composite material is low and difficult to control
This method is simple to operate, but there is still sulfur attached to the surface of the carbon, and most sulfur-dissolving organic solvents are toxic

Method used

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  • Sulfur/carbon composite material and preparation method thereof
  • Sulfur/carbon composite material and preparation method thereof
  • Sulfur/carbon composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] At room temperature, add 3.2 g of sublimed sulfur to 17 g of ammonium sulfide aqueous solution with a mass concentration of 20% to generate an ammonium polysulfide solution; then add 0.08 g of surfactant polyethylene glycol octyl phenyl to the ammonium polysulfide solution in turn ether and 0.8 g of activated carbon, stirred for 2 hours, and after stirring evenly, the mixture was placed in an ultrasonic cleaner for 1 hour at a power of 150W for ultrasonic oscillation, and then placed in a magnetic stirrer to stir at a certain speed, heated to 95 ° C, so that more The sulfur generated by the thermal decomposition of ammonium sulfide is deposited in-situ into the pores of the activated carbon material, and then separated by filtration to obtain a sulfur / carbon composite material and a filtrate; the obtained sulfur / carbon composite material is washed with distilled water until neutral, and then heated at 80 °C. Vacuum drying to obtain a sulfur / carbon composite material with...

Embodiment 2

[0055] At room temperature, add 3.2g of sublimed sulfur to 17g of ammonium sulfide solution with a mass concentration of 20% to generate ammonium polysulfide solution; then add 0.32g of surfactant polyethylene glycol and 3.2g of activated carbon to the ammonium polysulfide solution in turn , stir for 1h, and after stirring evenly, the mixture is placed in an ultrasonic cleaner with a power of 100W for ultrasonic oscillation for 1h, and placed in a magnetic stirrer to stir at a certain speed, and heated to 95 ℃, so that ammonium polysulfide is heated and decomposed to form The sulfur in situ was deposited into the pores of the carbon material, and then centrifuged to obtain the sulfur / carbon composite material and filtrate; the obtained sulfur / carbon composite material was washed with ethanol to neutrality, and then vacuum-dried at 70 °C to obtain the sulfur / carbon composite material. / carbon composites.

Embodiment 3

[0057] At room temperature, add 3.2g of sedimentary sulfur to 6.8g of ammonium sulfide solution with a mass concentration of 20% to generate ammonium polysulfide solution; then add 0.21g of surfactant polyethylene glycol and 1.37g of ammonium polysulfide solution to the solution in turn Carbon black, stirred for 1 hour, and after stirring evenly, the mixture was placed in an ultrasonic cleaner with a power of 60W for ultrasonic oscillation for 1 hour, and placed in a magnetic stirrer to stir at a certain speed, and heated to 120 ° C to heat the ammonium polysulfide. The decomposed sulfur is deposited in-situ into the pores of the carbon material, filtered and separated to obtain a sulfur / carbon composite material and a filtrate; the obtained sulfur / carbon composite material is washed with distilled water until neutral, and then vacuum-dried at 80 °C to obtain the sulfur / carbon composite material. / carbon composites.

[0058] Electrochemical performance testing of sulfur / carbon...

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Abstract

The invention discloses a sulfur / carbon composite material and a preparation method thereof. Nanometer sulfur is uniformly filled in a pore path of a carbon material in the sulfur / carbon composite material to form the nanometer sulfur particle / carbon composite material. The preparation method comprises the following steps of: (1) reacting an aluminum sulfide solution with a sulfur source to generate an aluminum polysulfide solution; (2) adding a surface active agent and the carbon material into the aluminum polysulfide solution, uniformly stirring the resulting product, placing the uniformly stirred solution in an ultrasonic cleaner to carry out ultrasonic oscillation, and heating the resulting product to cause the sulfur generated by decomposition to in situ deposit to the pore path of the carbon material to obtain the sulfur / carbon composite material. According to the sulfur / carbon composite material, a sulfur particle and a carbon particle are tightly bound, the application of the sulfur / carbon composite material as the positive material of a lithium sulfur battery facilitates the reduction of solution loss of an active substance and the inhibition of shuttle effect, aluminum sulfide is generated from the ammonia gas and the hydrogen sulfide, which are generated by the decomposition of the aluminum polysulfide, through a condenser to be recycled, the technical process causes little pollution, the preparation method is simple in technology, low in cost and short in time, sulfur content is high, controllable, and strong in repeatability, and the sulfur / carbon composite material is easy for mass production.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a sulfur / carbon composite material and a preparation method thereof. Background technique [0002] With the popularization of portable electronic products, the rapid development of energy storage technology and electric vehicles, the requirements for the energy density and power density of lithium-ion batteries are getting higher and higher. It is predicted that in the future, 4G mobile communication requires the energy density of the battery to reach more than 500Wh / Kg. Lithium-sulfur batteries have the characteristics of high specific capacity (1675mAh / g) and high energy density (2600Wh / kg), and the raw material elemental sulfur resources are abundant, cheap and environmentally friendly; therefore, lithium-sulfur batteries have great development potential and application prospects. of high energy density secondary batteries. However, it has the disadvantage of poor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/13H01M4/139B82Y30/00
CPCY02E60/10
Inventor 张治安李劼蒋绍峰赖延清张凯刘晋贾明
Owner CENT SOUTH UNIV
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