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Preparation method of modified carbon nanofiber lithium-sulfur battery positive electrode material

A lithium-sulfur battery and nanofiber technology, applied in the field of material chemistry, can solve the problems of obvious shuttle effect, low sulfur loading, poor cycle stability, etc., and achieve the effects of good uniformity, high porosity, and enhanced conductivity.

Active Publication Date: 2020-04-24
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of a lithium-sulfur battery positive electrode material for the problems of low sulfur loading, obvious shuttle effect, and poor cycle stability in the existing lithium-sulfur battery positive electrode materials

Method used

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  • Preparation method of modified carbon nanofiber lithium-sulfur battery positive electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first step is to prepare the sheet-like structure composite precursor material:

[0026] 1.5 g of polyacrylonitrile and 3 g of cobalt acetate were placed in 15 mL of N,N-dimethylformamide, stirred for 12 hours, and composite nanofibers were prepared by electrospinning. After being torn off from the tin foil for electrospinning, it was first placed in a muffle furnace, and the temperature was raised to 300°C at a heating rate of 2°C / min, and kept for 2h. After cooling with the furnace, it was transferred to a tube furnace, and the temperature was raised to 700 °C under an argon atmosphere at a heating rate of 2 °C / min. After the heating was completed, it was kept for 2 hours, and naturally cooled to obtain a sheet-like structure composite precursor material.

[0027] The second step prepares cobalt nitride-cobalt tetroxide-carbon nanofiber composite material:

[0028] Put 0.3 g of the sheet-like composite precursor material prepared in the first step in a tube furna...

Embodiment 2

[0032] The first step is to prepare the sheet-like structure composite precursor material:

[0033] Take 2g of polyacrylonitrile and 5g of cobalt acetate in 20mL of N,N-dimethylformamide, stir for 24 hours and then prepare composite nanofibers by electrospinning. After being torn off from the tin foil for electrospinning, it was first placed in a muffle furnace, and the temperature was raised to 400°C at a heating rate of 5°C / min, and kept for 2h. Then cool with the furnace, transfer it to a tube furnace, raise the temperature to 800 °C in an argon atmosphere, the heating rate is 5 °C / min, keep warm for 2 h after the heating is completed, and then naturally cool to obtain a composite precursor material with a sheet structure.

[0034] The second step prepares cobalt nitride-cobalt tetroxide-carbon nanofiber composite material:

[0035] Put 0.3 g of the sheet-like composite precursor material prepared in the first step into a tube furnace, and raise the temperature to 600 °C u...

Embodiment 3

[0039] The first step is to prepare the sheet-like structure composite precursor material:

[0040]1 g of polyacrylonitrile and 1 g of cobalt acetate were placed in 10 mL of N,N-dimethylformamide, stirred for 12 hours, and composite nanofibers were prepared by electrospinning. After being torn off from the tin foil for electrospinning, it was first placed in a muffle furnace, and the temperature was raised to 200°C at a heating rate of 1°C / min, and kept for 1h. With the furnace cooling, it was transferred to a tube furnace, and the temperature was raised to 600 °C in an argon atmosphere at a heating rate of 1 °C / min. After the heating was completed, it was kept for 1 h, and then naturally cooled to obtain a composite precursor material with a sheet structure.

[0041] The second step prepares cobalt nitride-cobalt tetroxide-carbon nanofiber composite material:

[0042] Put 1 g of the sheet-like composite precursor material prepared in the first step in a tube furnace, and rai...

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Abstract

The invention relates to a preparation method of a modified carbon nanofiber lithium-sulfur battery positive electrode material. The preparation method comprises the steps of preparing cobaltosic oxide-polyacrylonitrile composite nanofibers, and nitriding to obtain a cobalt nitride-cobaltosic oxide composite material as the lithium-sulfur battery positive electrode material. According to the invention, an electrostatic spinning method is adopted in the preparation process; the fine structure of the fiber can be effectively regulated and controlled; polyacrylonitrile is adopted as a raw material, which facilitates rapid transfer of electrons in the charging and discharging process;and the electrochemical performance of the material is enhanced.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium-sulfur battery, in particular to a method of first preparing cobalt tetraoxide-polyacrylonitrile composite nanofibers and then nitriding them to obtain cobalt nitride-cobalt tetraoxide, which belongs to the field of material chemistry. Background technique [0002] Chemical battery, also known as chemical power supply, is a device that directly converts the energy generated by chemical reactions into low-voltage DC power. With the advancement of science and technology and the rapid development of society, people's demand for chemical power is increasing day by day. Compared with traditional secondary batteries, such as lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries, lithium-ion batteries have higher capacity and energy density, and are currently the most widely used chemical power sources. However, the transition metal layered...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/052D01F9/22D01F1/10C01G51/04C01B21/06B82Y30/00
CPCB82Y30/00C01B21/0615C01G51/04D01F1/10D01F9/22H01M4/38H01M4/624H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 钊妍王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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