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Preparation method of lithium-sulfur battery cathode material

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, secondary battery manufacturing, etc., can solve the problems of unsuitable for large-scale production, low conductivity of carbon materials, unsuitable for conventional use, etc., to improve charging The effect of discharge performance, large specific surface area, and low price

Inactive Publication Date: 2021-03-16
陈兆佳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, precious metal materials are mainly used as electrode materials, but the price of precious metals is high, which is not suitable for large-scale production; the use of carbon materials as electrodes is cheap, but pure carbon materials have low conductivity and are not suitable for routine use.

Method used

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  • Preparation method of lithium-sulfur battery cathode material
  • Preparation method of lithium-sulfur battery cathode material
  • Preparation method of lithium-sulfur battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of cathode material of lithium-sulfur battery, its preparation method comprises the following steps:

[0028] S1: Add 1g of carbon nanotube CNT into 75ml of concentrated nitric acid, stir in a water bath at 80°C for 4h, then wash with ultrapure water and dry, grind the dried CNT into powder, and wash with absolute ethanol for 3 times , vacuum drying;

[0029] S2: Add 0.5g of the product of step S1 into a mixed solution of 25ml of methanol and 50ml of water, add 0.5g of melamine and stir until completely dissolved, then stir at 80°C until the solution is completely volatilized, then transfer the mixture to a tube furnace, and Nitrogen, calcined at 900°C for 1.5h, finally washed with ultrapure water and ethanol and dried;

[0030] S3: Mix 0.5g of the product of step S2 and 1.25g of sulfur powder into a mortar, grind for 30min, then transfer it to a vacuum glass tube, calcinate at 150°C for 20h, then heat up to 220°C for 3h;

[0031] S4: Add 0.5g of copper nitrate...

Embodiment 2

[0041] A kind of cathode material of lithium-sulfur battery, its preparation method comprises the following steps:

[0042] S1: Add 1g of carbon nanotube CNT to 50ml of concentrated nitric acid, stir in a water bath at 100°C for 3 hours, then wash with ultrapure water and dry, grind the dried CNT into powder, and wash with absolute ethanol for 3 times , vacuum drying;

[0043]S2: Add 0.5g of the product of step S1 into a mixed solution of 30ml of methanol and 60ml of water, add 0.5g of melamine and stir until it is completely dissolved, then stir at 80°C until the solution is completely volatilized, then transfer the mixture to a tube furnace and pass it into Nitrogen, calcined at 800°C for 2h, finally washed with ultrapure water and ethanol and dried;

[0044] S3: Mix 0.5g of the product of step S2 and 1g of sulfur powder into a mortar, grind for 30min, then transfer it to a vacuum glass tube, calcinate at 150°C for 16h, then heat up to 220°C for 4h;

[0045] S4: Add 0.5g o...

Embodiment 3

[0048] A kind of cathode material of lithium-sulfur battery, its preparation method comprises the following steps:

[0049] S1: Add 1g of carbon nanotube CNT to 100ml of concentrated nitric acid, stir in a water bath at 60°C for 5h, then wash with ultrapure water and dry, grind the dried CNT into powder, and wash with absolute ethanol for 3 times , vacuum drying;

[0050] S2: Add 0.5g of the product of step S1 into a mixed solution of 20ml of methanol and 40ml of water, add 0.5g of melamine and stir until it is completely dissolved, then stir at 80°C until the solution is completely volatilized, then transfer the mixture to a tube furnace and pass it into Nitrogen, calcined at 1000°C for 1h, finally washed with ultrapure water and ethanol and dried;

[0051] S3: Mix 0.5g of the product of step S2 and 1.5g of sulfur powder into a mortar, grind for 30min, then transfer it to a vacuum glass tube, calcinate at 150°C for 24h, then heat up to 220°C for 2h;

[0052] S4: Add 0.5g of...

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Abstract

The invention discloses a preparation method of a lithium-sulfur battery positive electrode material. The lithium-sulfur battery positive electrode material comprises the following raw materials: carbon nanotubes (CNT), melamine, sulfur powder, copper nitrate, cobalt nitrate and dimethylimidazole, and the preparation method comprises the following steps: modifying the carbon nanotubes with nitricacid, mixing and stirring with melamine, and calcining; and calcining and vulcanizing by using S powder, and synthesizing CuCo-MOF / S-N-CNT by using a hydrothermal method. The composite material prepared by the invention is used as a positive electrode material of a lithium-sulfur battery and has good charging and discharging performance and stability.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode material, in particular to a CuCo-MOF / S-N-CNT cathode material. Background technique [0002] As the cornerstone of the development of modern society, energy issues have become a hot topic of widespread concern. In addition, energy is also the internal driving force of today's technological innovation and social progress. With the continuous advancement of the industrial revolution, non-renewable energy represented by coal and oil has been excessively exploited and used. At the same time, the irrational use of a large number of fossil energy has also caused serious environmental pollution problems. At the same time, fossil energy such as coal and oil are non-renewable energy sources with limited resource reserves. As time goes by, the total amount of exploitable resources is gradually exhausted. Therefore, the development of new clean energy sources has become inevitable. Lithium-ion batteries...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/052H01M10/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/38H01M4/625H01M10/0427H01M10/052H01M2004/021H01M2004/028Y02E60/10Y02P70/50
Inventor 陈兆佳李伟翔
Owner 陈兆佳
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