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a ti 3 c 2 t x / Preparation method of sulfur-carbon composite material

A technology of sulfur-carbon composite materials and carbon materials, which is applied to structural parts, electrical components, battery electrodes, etc., can solve the problems of reducing the utilization rate of sulfur active substances, slow migration speed, and slow electrochemical reaction kinetics, etc., to achieve Prevent the movement of polysulfides, increase the lifespan, and reduce the effect of the shuttle effect

Active Publication Date: 2019-11-29
苏州飞泰精工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon, known as the shuttle effect, reduces the availability of sulfur active species
At the same time insoluble Li 2 S and Li 2 S 2 Deposited on the surface of the lithium negative electrode, which further deteriorates the performance of the lithium-sulfur battery; (3) the final product of the reaction, Li 2 S is also an electronic insulator and will be deposited on the sulfur electrode, while lithium ions migrate slowly in solid lithium sulfide, slowing down the electrochemical reaction kinetics; (4) sulfur and the final product Li 2 The density of S is different. When sulfur is lithiated, the volume expands by about 79%, which easily leads to Li 2 Pulverization of S, causing safety problems in lithium-sulfur batteries
The above deficiencies restrict the development of lithium-sulfur batteries, which is also a key issue that needs to be solved in current research on lithium-sulfur batteries.

Method used

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  • a ti <sub>3</sub> c <sub>2</sub> t <sub>x</sub> / Preparation method of sulfur-carbon composite material
  • a ti <sub>3</sub> c <sub>2</sub> t <sub>x</sub> / Preparation method of sulfur-carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add 1g of octaphenyloctasilsesquioxane to 50mL of 1,2-dichloroethane, mechanically stir at 50°C to dissolve, then add 0.05g of Ti 3 AlC 2 Ceramic powder, stirred to form a suspension;

[0021] (2) Add 0.05g of anhydrous aluminum chloride catalyst and 10g of carbon tetrachloride crosslinking agent to the suspension, stir for 5 hours for crosslinking reaction, after the reaction, add ethanol / water solution, ethanol / dilute hydrochloric acid solution for washing, Washing with water and drying in vacuum to obtain the precursor;

[0022] (3) Place the precursor in a muffle furnace protected by a nitrogen atmosphere, calcinate at 800 °C for 5 h, and heat up at a rate of 1 °C / min;

[0023] (4) The carbonized product was etched in 20% hydrofluoric acid for 24 hours. After the corrosion, the solution was added to deionized water for centrifugation, and then the precipitate was dried to obtain Ti 3 C 2 T x / Spherical porous carbon material;

[0024] (5) Add 0.1g Ti 3 C...

Embodiment 2

[0026] (1) Add 1g of octaphenyloctasilsesquioxane to 100mL of 1,2-dichloroethane, mechanically stir at 70°C to dissolve, then add 0.5gTi 3 AlC 2 Ceramic powder, stirred to form a suspension;

[0027] (2) Add 0.1g of anhydrous aluminum chloride catalyst and 40g of carbon tetrachloride cross-linking agent to the suspension, stir and cross-link for 10 hours, after the reaction, add ethanol / water solution, ethanol / dilute hydrochloric acid solution for washing, Washing with water and drying in vacuum to obtain the precursor;

[0028] (3) The precursor was placed in a muffle furnace protected by a nitrogen atmosphere, and calcined at 1200 °C for 1 h, with a heating rate of 5 °C / min;

[0029] (4) The carbonized product was etched in 50% hydrofluoric acid for 4 hours, the solution was added to deionized water for centrifugation after corrosion, and then the precipitate was dried to obtain Ti 3 C 2 T x / Spherical porous carbon material;

[0030] (5) Add 0.3g Ti 3 C 2 T x / Sph...

Embodiment 3

[0032] (1) Add 1g of octaphenyloctasilsesquioxane to 70mL of 1,2-dichloroethane, mechanically stir at 60°C to dissolve, then add 0.1g of Ti 3AlC 2 Ceramic powder, stirred to form a suspension;

[0033] (2) Add 0.08g of anhydrous aluminum chloride catalyst and 20g of carbon tetrachloride crosslinking agent to the suspension, stir for 8 hours for crosslinking reaction, after the reaction, add ethanol / water solution, ethanol / dilute hydrochloric acid solution for washing, Washing with water and drying in vacuum to obtain the precursor;

[0034] (3) The precursor was placed in a muffle furnace protected by a nitrogen atmosphere, and calcined at 1000 °C for 3 h, with a heating rate of 3 °C / min;

[0035] (4) The carbonized product was etched in 30% hydrofluoric acid for 16 hours, and the solution was added to deionized water for centrifugation after corrosion, and then the precipitate was dried to obtain Ti 3 C 2 T x / Spherical porous carbon material;

[0036] (5) Add 0.2g Ti ...

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Abstract

The invention provides a method for preparing a Ti3C2Tx / sulfur carbon compound material. The compound material is prepared from a spherical carbon material having a porous structure, Ti3C2Tx and elemental sulfur dispersed in the porous structural carbon material, wherein the mass ratio of Ti3C2Tx to carbon to sulfur is (0.1-0.3):(0.1-0.3):1. According to the compound material, the T in Ti3C2Tx is -F radical or -OH radical, is a strong polar radical with oxygen on the surface of graphene oxide and can form intense chemical adsorption for polysulfide formed in charging and discharging processes, and micropores of the porous carbon material can perform physical adsorption for the polysulfide, and the compound material with both physical and chemical adsorption capability can be used for effectively stopping polysulfide motion, reducing occurrence of shuttle effect and prolonging service life of a lithium-sulfur battery.

Description

technical field [0001] The invention relates to the synthesis of nanometer materials, in particular to a preparation method of a cathode material of a lithium-sulfur battery. Background technique [0002] A lithium-sulfur battery is a battery system in which metallic lithium is used as the negative electrode and elemental sulfur is used as the positive electrode. Lithium-sulfur batteries have two discharge platforms (about 2.4 V and 2.1 V), but their electrochemical reaction mechanism is relatively complicated. Lithium-sulfur batteries have the advantages of high specific energy (2600 Wh / kg), high specific capacity (1675 mAh / g), and low cost, and are considered to be a promising new generation of batteries. However, at present, there are problems such as low utilization of active materials, low cycle life and poor safety, which seriously restrict the development of lithium-sulfur batteries. The main reasons for the above problems are as follows: (1) elemental sulfur is an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/628H01M10/052Y02E60/10
Inventor 钟玲珑
Owner 苏州飞泰精工科技有限公司