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A kind of graphene-coated microporous silkworm excrement sulfur composite cathode material and preparation method thereof

A composite cathode material, graphene coating technology, applied in the field of material chemistry and electrochemistry, can solve the problems of poor cycle performance, uneven sulfur loading, weak adsorption force of composite materials, achieve high rate performance, avoid pore blockage linearity , Improve the effect of adsorption

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 poor cycle performance of the composite material caused by uneven sulfur loading and weak adsorption of the existing porous materials, the present invention provides a graphene-coated microporous silkworm excrement sulfur composite positive electrode material and its preparation method, which utilizes gas-phase steam adsorption- In the process of chemical solution deposition, the sulfur component is loaded in the pores of microporous silkworm excrement with nanometer particle size, and then the graphene oxide sheet is coated by the solution method, and then the graphene oxide sheet is reduced to graphene by the microwave radiation method to obtain a long long-life carbon-sulfur composite cathode materials

Method used

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  • A kind of graphene-coated microporous silkworm excrement sulfur composite cathode material and preparation method thereof
  • A kind of graphene-coated microporous silkworm excrement sulfur composite cathode material and preparation method thereof
  • A kind of graphene-coated microporous silkworm excrement sulfur composite cathode material and preparation method thereof

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Effect test

Embodiment 1

[0038] A preparation method of a graphene-coated microporous silkworm excrement sulfur composite positive electrode material, comprising the following steps,

[0039] (1) Preparation of microporous silkworm excrement

[0040] in N 2In the atmosphere, 10.0g of raw silkworm excrement and 10.0g of KOH powder were raised to 800°C at a heating rate of 2°C / min, kept at 800°C for 0.5h, and then cooled to room temperature to obtain microporous silkworm excrement, which was designated as SPCM.

[0041] (2) Vacuum-steam method to load sulfur on microporous silkworm excrement

[0042] Spread 0.3g of SPCM powder in the ark first, and slowly push the ark into the middle of the quartz tube. Pour 1g of sulfur powder into the quartz tube without direct contact with the carbonized SPCM; vacuumize (vacuum degree ≤ 100Pa), seal it and put it into a programmable temperature-controlled drying oven, according to the temperature of 0.5 ℃ / min The heating rate was raised to 120°C, kept at a const...

Embodiment 2

[0047] A preparation method of a graphene-coated microporous silkworm excrement sulfur composite positive electrode material, comprising the following steps,

[0048] (1) Preparation of microporous silkworm excrement

[0049] in N 2 In the atmosphere, 10.0g of raw silkworm excrement and 30.0g of KOH powder were raised to 700°C at a heating rate of 5°C / min, kept at 700°C for 1.0h and then cooled to room temperature to obtain microporous silkworm excrement, which was designated as SPCM.

[0050] (2) Vacuum-steam method to load sulfur on microporous silkworm excrement

[0051] Spread 1.0g microporous silkworm excrement SPCM powder in the ark, and slowly push the ark into the middle of the quartz tube. Pour 2g of sulfur powder into the quartz tube without direct contact with microporous silkworm excrement SPCM; vacuumize (vacuum degree ≤ 100Pa), seal it and put it into a programmable temperature-controlled drying box, according to the temperature of 1.0 The heating rate of °C / m...

Embodiment 3

[0056] A preparation method of a graphene-coated microporous silkworm excrement sulfur composite positive electrode material, comprising the following steps,

[0057] (1) Preparation of microporous silkworm excrement

[0058] in N 2 In the atmosphere, 10.0g of raw silkworm excrement and 40.0g of KOH powder were raised to 600°C at a heating rate of 3°C / min, kept at 600°C for 2.0h, and then cooled to room temperature to obtain microporous silkworm excrement, which was designated as SPCM.

[0059] (2) Vacuum-steam method to load sulfur on microporous silkworm excrement

[0060] Spread 2.0g microporous silkworm excrement SPCM powder in the ark, and slowly push the ark into the middle of the quartz tube. Pour a certain amount of sulfur powder into the quartz tube, without direct contact with the microporous silkworm excrement SPCM; vacuumize (vacuum degree ≤ 100Pa), seal it and put it into a programmable temperature-controlled drying box, according to the following The temperatu...

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Abstract

The invention discloses a graphene clad micro-pore silkworm excrement and sulfur composite positive electrode material and a preparation method. The preparation method comprises the following steps: mixing silkworm excrement and KOH and putting the mixture into a high-temperature tubular furnace; heating and reacting under protective gas to obtain micro-pore silkworm excrement SPCM; then pouring sulfur powder, without direct contact with the SPCM; vacuumizing and sealing, and then putting into a drying box; after raising the temperature to react, taking out the product to obtain an SPCM / Sl composite material; then standing in a sodium thiosulfate solution and dropwise adding a hydrochloric acid solution to carry out a chemical deposition secondary sulfur-bearing reaction for 2h to 5h; after centrifuging and filtering, drying to obtain an SPCM / S composite material; and cladding the SPCM / S composite material with graphene oxide and reducing through microwave radiation to obtain a G-SPCM / S composite sulfur positive electrode. By adopting a vacuum-steam method and a chemical solution deposition method to load the sulfur, the adsorption acting force and the uniform dispersion degree of the sulfur on a carrier can be remarkably improved; and after the material is clad with graphene, the cycle life of the battery can also be prolonged.

Description

technical field [0001] The invention belongs to the technical field of material chemistry and electrochemistry, and specifically relates to a porous carbon material, a lithium-sulfur battery material and a preparation method 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 ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/625H01M10/0525Y02E60/10
Inventor 赵祯霞武阳周凯彬赵钟兴
Owner GUANGXI UNIV
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