A kind of carbon-sulfur material with high sulfur content and preparation method thereof

A content, carbon-sulfur technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of insufficient capacity, sulfur agglomeration, etc., to improve cycle performance and rate performance, enrich specific surface area, easy to achieve. Effect

Active Publication Date: 2020-05-22
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also many reports using chemical methods to synthesize carbon-sulfur composites with high sulfur content, but such composites often cause the agglomeration of sulfur, resulting in insufficient capacity.

Method used

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  • A kind of carbon-sulfur material with high sulfur content and preparation method thereof
  • A kind of carbon-sulfur material with high sulfur content and preparation method thereof
  • A kind of carbon-sulfur material with high sulfur content and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the first step, 1.8 g of sodium sulfate, 1.5 g of glucose and 15 g of deionized water were mixed to obtain a mixed solution.

[0023] In the second step, the melamine foam is immersed in the mixed solution, and after being squeezed and infiltrated repeatedly, it is freeze-dried at -50°C for 12 hours to obtain a precursor.

[0024] The third step is to put the precursor in a nitrogen-protected tube furnace, heat treatment reaction at 900°C, the heating rate is 5°C / min, and the holding time is 2 hours. After natural cooling, the intermediate product is obtained.

[0025] In the fourth step, the intermediate product was added into 60ml / 8g ferric chloride solution, and reacted under stirring for 6 hours to obtain the initial reaction product.

[0026] In the fifth step, the initial reaction product is vacuum filtered, washed with water three times, and then dried in an oven at 60°C to obtain the final product, which is a carbon-sulfur material with high sulfur content. ...

Embodiment 2

[0031] The difference from Example 1 is that lithium sulfate is used as a template and a sulfur source: 1.8 g of lithium sulfate, 1.5 g of glucose and 15 g of deionized water are mixed to obtain a mixed solution, and melamine foam is immersed in the mixed solution, and repeatedly extruded and infiltrated Afterwards, freeze-dry for 12 hours to obtain the precursor. The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0033] The difference from Example 1 is that magnesium sulfate is used as a template and a sulfur source: 1.8 g of magnesium sulfate, 1.5 g of glucose and 15 g of deionized water are mixed to obtain a mixed solution, and the melamine foam is immersed in the mixed solution, and repeatedly extruded and infiltrated Afterwards, freeze-dry for 12 hours to obtain the precursor. The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries and particularly relates to a high-sulfur-content carbon-sulfur material and a preparation method thereof; the carbon-sulfur material has three-dimensional porous structure and has sulfur content up to 85%; the preparation method of the carbon-sulfur material comprises the steps of I, mixing well a water-soluble sulfate, a water-soluble carbon source and water in a preset proportion to obtain mixed solution; II, adsorbing the mixed solution with foam material, and lyophilizing to obtain a precursor; III, thermally treating the precursor at high temperature to obtain an intermediate product; IV, adding the intermediate product into the solution with trivalent iron ions, allowing full reaction to obtain an initial reaction product; V, filtering the initial reaction product, washing, and drying to obtain the high-sulfur-content carbon-sulfur material. Compared with the prior art, the high-sulfur-content carbon-sulfur material has high sulfur content and good structural stability and may be used in lithium-sulfur battery cathodes to provide significant improvement in the cycle performance and rate performance of batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a carbon-sulfur material with high sulfur content used for the positive electrode of lithium-sulfur batteries and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries are considered as next-generation novel energy storage devices due to their high theoretical energy density and low energy consumption. However, studies have found that the dissolution and shuttling effect of lithium polysulfide (Li2Sn, 3≤n≤8), the reaction intermediate product in lithium-sulfur batteries, will lead to the loss of active materials, resulting in problems such as capacity fading and poor cycle life. In addition, sulfur and its discharge products (Li2S2 and Li2S) are basically non-conductive, which also restricts the improvement of the performance of lithium-sulfur batteries. The above problems seriously restrict the advantages of high energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/364H01M4/38H01M4/625H01M10/052H01M2004/021Y02E60/10
Inventor 吕伟罗冲杨全红康飞宇游丛辉
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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