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A kind of silkworm excrement porous carbon/mils composite sulfur cathode material and preparation method thereof

A technology of sulfur cathode material and composite material, which is applied in the fields of material chemistry and electrochemistry, can solve the problems of uneven sulfur loading, poor cycle performance of composite materials, weak adsorption force, etc., so as to avoid pore blockage and linearity, and the preparation method is simple and easy to operate. , the effect of improving adhesion

Active Publication Date: 2018-10-16
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of uneven sulfur loading and weak adsorption of existing porous materials, which lead to poor cycle performance of composite materials, the present invention provides a silkworm excrement porous carbon / MILs composite sulfur cathode material and a preparation method thereof. The sulfur component is loaded in the porous channel of silkworm excrement with nanometer particle size, and the carbon-MILs sulfur composite material with high dispersion and strong adsorption is obtained

Method used

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  • A kind of silkworm excrement porous carbon/mils composite sulfur cathode material and preparation method thereof
  • A kind of silkworm excrement porous carbon/mils composite sulfur cathode material and preparation method thereof
  • A kind of silkworm excrement porous carbon/mils composite sulfur cathode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of preparation method of the preparation method of SPC-MILs / S cathode material, comprises the following steps,

[0038] (1) Preparation of silkworm excrement porous carbon

[0039] in N 2 In the atmosphere, 10.0g of original silkworm excrement and 10.0g of ZnCl 2 The powder was raised to 300°C at a heating rate of 2°C / min, kept at 300°C for 0.5h, and then cooled to room temperature to obtain silkworm excrement porous carbon, denoted as SPC.

[0040] (2) Preparation of silkworm excrement porous carbon / MILs composite carrier:

[0041] First, 1.0 g of silkworm excrement porous carbon, 0.5 g of chromium nitrate nonahydrate and 0.17 g of terephthalic acid were placed in 50 mL of aqueous solution, and reacted at 180 °C for 20 h; suction filtered and dried to obtain the silkworm excrement porous carbon / MILs composite material, namely is SPC-MIL(Cr);

[0042] (3) Sulfur loading on SPC-MIL(Cr) by vacuum-steam method

[0043]Spread 0.3g of SPC-MIL(Cr) powder in the ar...

Embodiment 2

[0047] A kind of preparation method of the preparation method of SPC-MILs / S cathode material, comprises the following steps,

[0048] (1) Preparation of silkworm excrement porous carbon

[0049] in N 2 In the atmosphere, 10.0g of original silkworm excrement and 30.0g of ZnCl 2 The powder was raised to 400°C at a heating rate of 5°C / min, kept at 400°C for 1.0 h, and then cooled to room temperature to obtain silkworm excrement porous carbon, denoted as SPC.

[0050] (2) Preparation of silkworm excrement porous carbon / MILs composite carrier:

[0051] First, 1.0 g of silkworm excrement porous carbon, 1.0 g of chromium nitrate nonahydrate and 0.2 g of terephthalic acid were placed in 50 mL of aqueous solution, and reacted at 190 ° C for 10 h; suction filtered and dried to obtain the silkworm excrement porous carbon / MILs composite material, namely is SPC-MIL(Cr);

[0052] (3) Sulfur loading on SPC-MIL(Cr) by vacuum-steam method

[0053] Spread 1.0g of SPC-MIL(Cr) powder in the ...

Embodiment 3

[0057] A kind of preparation method of the preparation method of SPC-MILs / S cathode material, comprises the following steps,

[0058] (1) Preparation of silkworm excrement porous carbon

[0059] in N 2 In the atmosphere, 10.0g of original silkworm excrement and 40.0g of ZnCl 2 The powder was raised to 500°C at a heating rate of 3°C / min, kept at 500°C for 2.0 h, and then cooled to room temperature to obtain silkworm excrement porous carbon, denoted as SPC.

[0060] (2) Preparation of silkworm excrement porous carbon / MILs composite carrier:

[0061] First, 1.0 g of silkworm excrement porous carbon, 2.0 g of ferric nitrate and 0.6 g of trimesic acid were placed in 50 mL of aqueous solution, and reacted at 200 ° C for 13 h; suction filtered and dried to obtain the silkworm excrement porous carbon / MILs composite material, namely SPC -MIL(Fe);

[0062] (3) Sulfur loading on SPC-MIL(Fe) by vacuum-steam method

[0063] Spread 2.0g of SPC-MIL(Fe) powder in the ark, and slowly push...

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Abstract

The invention discloses a silkworm excrement porous carbon / MILs (Metarial Sofistitute Lavoisierframeworks) composite sulfur positive electrode material and a preparation method thereof. The preparation method comprises the following steps: firstly, growing MILs on silkworm excrement porous carbon to obtain silkworm excrement porous carbon SPC-MILs with a high specific surface area; then, putting the silkworm excrement porous carbon SPC-MILs into a quartz tube, and pouring powdered sulfur into the quartz tube in a way that the powdered sulfur does not come into direct contact with the SPC-MILs; performing vacuum pumping and sealing, placing the quartz tube into a drying box, heating to 120-160 DEG C, keeping a constant temperature for 8-20 hours, taking the materials out, and naturally cooling to the room temperature to obtain an SPC-MILs / S<1> composite material; and placing the SPC-MILs / S<1> composite material into a sodium thiosulfate solution to perform standing, dropwise adding a hydrochloric acid solution to perform a chemical sedimentation secondary sulfur-carrying reaction for 2-5 hours, performing centrifugal filtration, and performing drying to obtain an SPC-MILs / S composite material. Sulfur is loaded by a vapor-liquid diffusion method, so that the sulfur can be loaded in an SPC-MILs pore canal at strong adsorption position; the adsorption acting force and uniform dispersity of the sulfur on a carrier can be enhanced remarkably; and the cycle life of a positive electrode of a battery is prolonged.

Description

technical field [0001] The invention belongs to the technical fields of material chemistry and electrochemistry, and in particular relates to porous materials, lithium-sulfur battery materials and preparation methods thereof. Background technique [0002] The over-exploitation and massive consumption of fossil energy have caused increasingly serious global energy crisis and environmental problems, which have seriously threatened the living environment of human beings and the sustainable development of social economy. Therefore, accelerating the development and utilization of new energy, especially clean and renewable energy, is the common primary task and severe challenge that human society faces in the new century. The recyclable secondary battery is an excellent energy storage device for various renewable energy sources (such as solar energy, wind energy, tidal energy, etc.), and is an indispensable and important component of future clean renewable energy, which has a majo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M10/052H01M2004/021Y02E60/10
Inventor 赵祯霞周凯彬武阳赵钟兴
Owner GUANGXI UNIV