Preparation method and application of heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material

A technology of metal sulfide and carbon nanotubes, applied in electrical components, battery electrodes, electrochemical generators, etc., to achieve improved cycle performance, good industrialization prospects, and reduced polarization

Active Publication Date: 2019-05-28
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 heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material
  • Preparation method and application of heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material
  • Preparation method and application of heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material

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Embodiment 1

[0022] A method for preparing a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material, comprising the following steps:

[0023] 1) Prepare 100 mL of a mixed solution of absolute ethanol and water, the volume ratio of water and ethanol is 9:1;

[0024] 2) Disperse 3g of cyanoamine in the above mixed solution. After ultrasonic dissolution is complete, add 0.3g of ferric sulfate. After ultrasonication for 20 minutes, add 0.3g of fructose to ultrasonically dissolve completely, remove the solvent by rotary evaporation, and then Precursor powder is prepared by vacuum drying;

[0025] 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 materia...

Embodiment 2

[0029] A method for preparing a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material, comprising the following steps:

[0030] 1) Prepare 200 mL of a mixed solution of absolute ethanol and water, and the ratio of water to ethanol is 19:1;

[0031] 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 to dissolve completely by ultrasonic, remove the solvent by rotary evaporation, and then Precursor powder is prepared by vacuum drying;

[0032] 3) Put the above precursor powder into the tube furnace, raise the temperature to 600°C at a rate of 2°C / min under argon, keep it 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

[0036] A method for preparing a heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode material, comprising the following steps:

[0037] 1) Prepare 200 mL of a mixed solution of absolute ethanol and water, and the ratio of water to ethanol is 15:1.

[0038] 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 to dissolve completely by ultrasonic, remove the solvent by rotary evaporation, and then Precursor powder is prepared by vacuum drying;

[0039] 3) Put the above precursor powder into the tube furnace, raise the temperature to 600°C at a rate of 2°C / min under argon, keep it for two hours, and then increase 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 nanop...

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Abstract

The invention discloses a preparation method and application of a heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material. The heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material can be obtained by dispersing transition metal salts, fructose, cyanamide and the like in a solvent, uniformly mixing, carrying outrotary evaporation treatment, fully drying the obtained powder, carrying out high-temperature sintering in an inert atmosphere, and carrying out hydrothermal vulcanization treatment on the powder subjected to heat treatment by using thioacetamide. According to a composite electrode prepared from the heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material, according to the characteristics in the charge-discharge cycle of the negative electrode material of the sodium-ion battery, the uniform carbon layer is packaged and coated outside the active substance, and the one-dimensional structure of the carbon nano tube is beneficial to improving electron conduction, so that the electrochemical performance of the electrode material is effectively improvedand improved. The preparation method is simple in operation process, high in yield, excellent in charge-discharge performance of the material and convenient for industrial production.

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, ...

Claims

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Application Information

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Patent Type & Authority Applications(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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