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Ultrafine sulfur/carbon composite material as well as preparation method and application thereof

A technology of carbon composite materials and ultra-fine sulfur, which is applied in nanotechnology for materials and surface science, electrode manufacturing, structural parts, etc., can solve the problem of low sulfur loading of sulfur/carbon composite materials, which is unfavorable for large-scale commercialization Promotion, active material sulfur loss and other issues, to achieve the effect of easy large-scale promotion and application, increase conductivity, and promote full mixing

Pending Publication Date: 2022-07-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the long-term high-temperature treatment of sulfur in the preparation process, this method easily leads to a large loss of active substance sulfur, resulting in low sulfur loading of sulfur / carbon composites.
The above methods for preparing sulfur-carbon composite materials generally have disadvantages such as high energy consumption, long time consumption, and easy environmental pollution, which is not conducive to large-scale commercialization in the future

Method used

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  • Ultrafine sulfur/carbon composite material as well as preparation method and application thereof
  • Ultrafine sulfur/carbon composite material as well as preparation method and application thereof
  • Ultrafine sulfur/carbon composite material as well as preparation method and application thereof

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preparation example Construction

[0049] see figure 1 , a preparation method of an ultra-fine sulfur / carbon composite material of the present invention, comprising the following steps:

[0050] S1. Weigh the carbon material and the sulfur powder respectively, and premix the two to obtain a premix;

[0051] The carbon materials are porous carbon, carbon nanotubes, graphene, three-dimensional carbon skeletons, and carbon materials that are element-doped or modified with metals and metal compounds, or a combination of the above-mentioned materials.

[0052] Porous carbon is porous activated carbon, porous conductive carbon, porous carbon spheres, porous hollow carbon, and various microporous carbon, mesoporous carbon, macroporous carbon, or a combination of the above materials.

[0053] The three-dimensional carbon skeleton is a three-dimensional graphene aerogel, a three-dimensional carbon nanofiber membrane, a three-dimensional carbon material with various pore morphologies, or a combination of the above mater...

Embodiment 1

[0063] (1) Weigh 40mg of sulfur powder and 20mg of CMK-3 mesoporous carbon, grind and mix with a mortar, and grind until the color no longer changes to obtain a powdery premix;

[0064] (2) The powdery premix in (1) is sealed in the sample chamber, and the vacuum degree of the environment in the sample chamber is 10Pa;

[0065] (3) The sealed sample cavity in (2) is placed in a microwave synthesizer, the power is set to 200W, and the time is set to 20s. Start the microwave synthesizer to prepare ultra-fine sulfur / carbon composites.

Embodiment 2

[0067] (1) Weigh 40mg sulfur powder and 20mg CMK-3 mesoporous carbon, grind and mix the two with a mortar, grind until the color no longer changes, and obtain a powdery premix;

[0068] (2) The powdery premix in (1) is sealed in the sample chamber, and the vacuum degree of the environment in the sample chamber is 10Pa;

[0069] (3) The sealed sample cavity in (2) was placed in a microwave synthesizer, the power was set to 300W, and the time was set to 20s. Start the microwave synthesizer to prepare ultra-fine sulfur / carbon composites.

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Abstract

The invention discloses an ultrafine sulfur / carbon composite material as well as a preparation method and application thereof. The characteristics that a carbon material can fully absorb microwave energy in a vacuum environment and convert the microwave energy into heat energy, and sulfur is easy to sublimate at an instantaneous high temperature are utilized. According to the method, sulfur powder and a carbon material are preliminarily mixed to prepare a premix, the premix is sealed in a sample cavity in a vacuum environment, and the sample cavity is placed in a microwave synthesizer for microwave treatment. The carbon material absorbs microwave energy and converts the microwave energy into heat energy, solid sulfur is heated and sublimated in a short time and is rapidly distributed in the carbon material in a gaseous form, the particle size of sulfur powder is obviously reduced after cooling, sulfur is uniformly distributed in the carbon material, and the ultra-fine sulfur / carbon composite material is prepared. The ionization phenomenon of gas molecules in the vacuum environment is less, the energy loss is less, and the energy conversion efficiency is high. Compared with a traditional solid-phase, liquid-phase and gas-phase mixing method, the method is short in time consumption, low in energy consumption, free of pollution, environmentally friendly and beneficial to large-scale production and commercial popularization.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and particularly relates to an ultra-fine sulfur / carbon composite material and a preparation method and application thereof. Background technique [0002] As a secondary lithium battery energy storage system, lithium-sulfur batteries have been favored in academia and industry in recent years due to their low cost and high energy density, and are expected to achieve large-scale practical applications. However, the poor conductivity of sulfur, the active material of lithium-sulfur batteries, the shuttle effect of discharge intermediates, the complex procedures and high energy consumption in the preparation of cathode materials limit the commercialization of lithium-sulfur batteries. [0003] In order to overcome the above problems, carbon materials are often used as matrix materials for the cathode of lithium-sulfur batteries in recent years. Carbon materials have the characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/38H01M4/62B82Y30/00B82Y40/00H01M10/052
CPCH01M4/0471H01M4/38H01M4/625B82Y30/00B82Y40/00H01M10/052H01M2004/028H01M2004/021
Inventor 韩晓刚成智丛智夏立南杨超赵斌卢亚飞
Owner XI AN JIAOTONG UNIV