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

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...

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