Preparation method and application of a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material

A metal sulfide and carbon nanotube technology, applied in electrical components, battery electrodes, electrochemical generators, etc., to achieve good large-scale application potential, simple operation process, and excellent charge-discharge performance.

Active Publication Date: 2022-02-01
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the technology of encapsulating transition metal sulfides inside carbon nanotubes has rarely been reported at home and abroad.

Method used

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  • Preparation method and application of a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material
  • Preparation method and application of a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material
  • Preparation method and application of a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material

Examples

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Effect test

Embodiment 1

[0021] A method for preparing a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material, comprising the following steps:

[0022] 1) Prepare 100mL of a mixed solution of absolute ethanol and water, the volume ratio of water and ethanol is 9:1;

[0023] 2) Disperse 3 g of cyanoamine in the above mixed solution. After ultrasonic dissolution is complete, add 0.3 g of ferric sulfate. After ultrasonication for 20 minutes, add 0.3 g of fructose to ultrasonically dissolve completely, remove the solvent by rotary evaporation, and then Precursor powder is prepared by vacuum drying;

[0024] 3) Transfer the precursor powder into a tube furnace, raise the temperature to 600°C at a rate of 2°C / min under argon, keep it for two hours, then raise it to 800°C at a rate of 2°C / min, and keep it After cooling down to room temperature for two hours, a black powder is obtained, which is the carbon nanotube-encapsulated iron nanoparticle composite mater...

Embodiment 2

[0028] A method for preparing a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material, comprising the following steps:

[0029] 1) Prepare 200mL of a mixed solution of absolute ethanol and water, the ratio of water to ethanol is 19:1;

[0030] 2) Disperse 3 g of cyanoamine in the above mixed solution. After ultrasonic dissolution is complete, add 0.6 g of ferric sulfate. After ultrasonication for 20 minutes, add 0.3 g of fructose and ultrasonically dissolve completely, remove the solvent by rotary evaporation, and then Precursor powder is prepared by vacuum drying;

[0031] 3) Put the above precursor powder into a tube furnace, raise the temperature to 600°C at a rate of 2°C / min under argon, keep it warm for two hours, and then raise the temperature to 800°C at a rate of 2°C / min, After two hours of heat preservation, it was lowered to room temperature to obtain a black powder, which is a carbon nanotube-encapsulated iron nanopart...

Embodiment 3

[0035] A method for preparing a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material, comprising the following steps:

[0036] 1) Prepare 200mL of a mixed solution of absolute ethanol and water, and the ratio of water to ethanol is 15:1.

[0037] 2) Disperse 3 g of cyanoamine in the above mixed solution. After ultrasonic dissolution is complete, add 0.1 g of ferric sulfate. After ultrasonication for 20 minutes, add 0.3 g of fructose and ultrasonically dissolve completely, remove the solvent by rotary evaporation, and then Precursor powder is prepared by vacuum drying;

[0038] 3) Put the above precursor powder into a tube furnace, raise the temperature to 600°C at a rate of 2°C / min under argon, keep it warm for two hours, and then raise the temperature to 800°C at a rate of 2°C / min, After two hours of heat preservation, it was lowered to room temperature to obtain a black powder, which is a carbon nanotube-encapsulated iron nano...

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Abstract

The invention discloses a preparation method and application of a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material. Disperse transition metal salts, fructose, cyanoamine, etc. in a solvent and mix them uniformly, then undergo rotary evaporation treatment, fully dry the obtained powder, and sinter at high temperature in an inert atmosphere, and heat-treated powder. Thioacetamide hydrothermal vulcanization treatment can obtain heteroelement-doped carbon nanotube-encapsulated metal sulfide materials. The composite electrode prepared by encapsulating metal sulfide materials with heteroelement-doped carbon nanotubes, according to the characteristics of the negative electrode materials of sodium ion batteries in the charge-discharge cycle, encapsulates and coats a uniform carbon layer on the outside of the active material, and the carbon nanotubes The one-dimensional structure is conducive to improving electron conduction, thereby effectively improving and enhancing the electrochemical performance of electrode materials. The preparation and operation process of the invention is simple, the yield is high, the charge and discharge performance of the material is excellent, and the industrial production is convenient.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for sodium ion batteries, in particular to a preparation method and application of heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode materials. Background technique [0002] The working principle of sodium-ion batteries is similar to that of lithium-ion batteries, using the intercalation process of sodium ions between the positive and negative electrodes to achieve charge and discharge. Compared with lithium-ion batteries, sodium-ion batteries have the following advantages: (1) Na-salt raw materials are rich in reserves and low in price. Compared with lithium-ion battery ternary cathode materials, the cost of raw materials is reduced by half by using iron-manganese-nickel-based cathode materials; 2) Due to the characteristics of sodium salt, it is allowed to use low-concentration electrolyte (with the same concentration electrolyte, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M10/054
CPCY02E60/10
Inventor 岳鹿张文惠顾大国浦旭清茅思佳戴鑫关荣锋
Owner YANCHENG INST OF TECH
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