A preparation method of sulfur-carbon composite powder material, powder material and application

A powder material, sulfur-carbon composite technology, applied in structural parts, electrical components, battery electrodes, etc., can solve environmental pollution, toxicity and other problems, and achieve the effects of environmental friendliness, controllable composition, simple process and operation

Active Publication Date: 2018-10-30
中科派思储能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the organic solvents used in the sulfur dissolution method are toxic and pollute the environment

Method used

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  • A preparation method of sulfur-carbon composite powder material, powder material and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: At room temperature, add 30kg of refined sulfur to the liquid sulfur supply system of the synthesis equipment, feed nitrogen, heat the sulfur to liquid at 115°C, and store it in a liquid storage tank at a constant temperature of 115°C;

[0038] Step 2: Mix 30kg particle size D 50 About 2.6m graphene powder is added to the fluidized bed;

[0039] Step 3: Start the gas compressor, the compressed nitrogen gas enters from the bottom of the fluidized bed, adjust the gas flow rate to about 0.5m / s, so that the graphene powder is in a fluidized state, and the temperature of the nitrogen gas is -30°C; Step 4: Put the storage liquid The liquid sulfur in the tank is delivered to the atomization chamber and nitrogen gas is introduced. The mass ratio of sulfur to nitrogen is 1:1. The atomization pressure of the nitrogen gas flow is 0.2MPa. into the fluidized bed; the distance from the atomizer nozzle to the fluidized bed is 10m, and the heating temperature of the heating de...

Embodiment 2

[0042] Step 1: At normal temperature, add 1kg of settled sulfur into the liquid sulfur supply system of the synthesis equipment. Introduce nitrogen, heat the sulfur to liquid at 200°C, and store it in a liquid storage tank at a constant temperature of 200°C;

[0043] Step 2: Dilute 9kg of particle size D 50 About 0.01m, carbon black powder with mesoporous structure is added into the fluidized bed;

[0044] Step 3: Start the gas compressor, compressed nitrogen enters from the bottom of the fluidized bed, adjust the gas flow rate to about 100m / s, so that the carbon powder is in a fluidized state, and the temperature of nitrogen is 100°C;

[0045]Step 4: Transport the liquid sulfur in the liquid storage tank to the atomization chamber and inject nitrogen. The mass ratio of sulfur to nitrogen is 1:10. The atomization pressure of the nitrogen gas flow is 10MPa. About 120m / s, the distance from the atomizer nozzle to the fluidized bed is 2m; the heating temperature of the heating d...

Embodiment 3

[0048] Step 1: Add 81kg of sublimated sulfur into the liquid sulfur supply system of the synthesis equipment at normal temperature. Introduce argon gas, heat-melt sulfur to liquid state at 440°C, and store it in a liquid storage tank at a constant temperature of 440°C;

[0049] Step 2: Dilute 9kg of particle size D 50 About 0.5m carbon nanotubes are added to the fluidized bed of the synthesis equipment;

[0050] Step 3: Start the gas compressor, compress the argon gas to enter from the bottom of the fluidized bed, adjust the gas flow rate to about 0.1m / s, make the carbon nanotube powder in a fluidized state, and the temperature of the argon gas is -10°C;

[0051] Step 4: Transport the liquid sulfur in the liquid storage tank to the atomization chamber and introduce argon, the mass ratio of sulfur to argon is 8:2, the atomization pressure of the argon gas flow is 0.1MPa, and the atomized liquid sulfur Sulfur is sprayed into the fluidized bed at a flow rate of about 0.8m / s, th...

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Abstract

The invention provides a preparation method of a high-performance sulfur-carbon composite powder material. The method concretely comprises the following steps: 1, placing a carbon powder material in a fluidized bed, continuously introducing a gas from the bottom of the fluidized bed, and adjusting the flow velocity of the gas to make the carbon powder be in a fluidized state; and 2, processing elemental sulfur to prepare liquid sulfur, keeping the temperature of the liquid sulfur in a range of 113-440DEG C, atomizing the liquid sulfur, spraying the atomized liquid sulfur into the fluidized bed to make the atomized liquid sulfur be in contact with the fluidized carbon powder material, and cooling the contact mixture to prepare the sulfur-carbon composite powder material. The sulfur-carbon composite powder material prepared in the invention has the following advantages: the sulfur / carbon ratio and the particle size are adjustable and controllable, carbon and sulfur are uniformly distributed in the composite material, and the particle size of the material is uniform; sulfur and carbon are compactly combined in the composite material, and the electricity conductivity is high; carbon coated outside sulfur can effectively inhibit dissolving loss and shuttle effect of polysulfide; and the composite powder material has a spherical or spheroidic morphology and high tap density, and the processing performance of the material is improved.

Description

technical field [0001] The invention belongs to the field of chemical power sources, and relates to a preparation method of a lithium-sulfur battery cathode material, in particular to a preparation method of a high-performance sulfur-carbon composite powder material. Background technique [0002] Social development has an increasing demand for energy storage technology. Lithium-sulfur batteries have the advantages of high theoretical energy density of 2600Wh / kg, abundant reserves of battery raw materials, and low cost. They have broad application potential and become a research hotspot for high specific energy secondary batteries. [0003] But lithium-sulfur batteries have some problems. Firstly, the ionic conductivity and electronic conductivity of elemental sulfur are extremely low; secondly, polysulfides, the intermediate products of the discharge process, are easily dissolved in organic solvents, and a "shuttle effect" occurs, resulting in the loss of sulfur and the cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/052
CPCY02E60/10
Inventor 陈剑刘颖佳郭德才
Owner 中科派思储能技术有限公司
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