Sulfur-nitrogen doped carbon nanofiber-MXene composite material for lithium-sulfur battery and preparation method thereof

A nanofiber, nitrogen-doped carbon technology, applied in the field of materials, can solve problems such as hindering the discharge reaction between electrolyte and electrode active material, increasing electrode polarization resistance, reducing battery cycle life, etc., to improve cycle stability and pore size. Small, the effect of facilitating the transmission of electrons

Active Publication Date: 2019-03-08
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the dissolution and diffusion of a large amount of polylithium sulfide in the electrolyte will lead to the loss of positive active materials and reduce the cycle life of the battery; in addition, the discharge product lithium sulfide Li 2 S 2 and Li 2 S will precipitate from the organic electrolyte and cover the surface of the sulfur cathode, forming an insulating lithium sulfide film, which hinders the discharge reaction between the electrolyte and the electrode active material.
(3) The chemical properties of metal lithium are very active, and it is easy to react with the electrolyte solution, and an SEI film is formed on the surface of the electrode material, resulting in an increase in the polarizat

Method used

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  • Sulfur-nitrogen doped carbon nanofiber-MXene composite material for lithium-sulfur battery and preparation method thereof
  • Sulfur-nitrogen doped carbon nanofiber-MXene composite material for lithium-sulfur battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of MXene:

[0028] Dip the ground MAX phase ceramic powder into a 40% HF solution with a mass fraction of 40%. The mass ratio of the ceramic powder to the HF solution is 1:20. The temperature is raised to 60°C and magnetically stirred for 18 hours. The product is obtained by centrifugation and deionized. Wash with water to neutral, place in an oven at 70°C and dry for 18 hours to obtain MXene. The MAX phase ceramic is Ti 3 AlC 2 , Get MXene material as Ti 3 C 2 .

[0029] (2) Preparation of nitrogen-doped carbon nanofiber-MXene composite material:

[0030] Take 1.5g polyacrylonitrile, 1.5g Ti prepared in step (1) 3 C 2 , Placed in 15 mL of N,N-dimethylformamide, stirred for 18 hours and then took a homogeneous solution to prepare MXene-doped polyacrylonitrile nanofibers by electrostatic spinning. Subsequently, the prepared MXene-doped polyacrylonitrile nanofibers were placed in a tube furnace and calcined at 800°C for 3 hours in an argon atmosphere, and then ...

Embodiment 2

[0036] (1) Preparation of MXene:

[0037] Dip the ground MAX phase ceramic powder into a 30% HF solution with a mass fraction of 30%. The mass ratio of the ceramic powder to the HF solution is 1:30. The temperature is raised to 50°C and magnetically stirred for 12 hours. The product is obtained by centrifugation and deionized. Wash with water to neutral, place in an oven at 60°C and dry for 12 hours to obtain MXene. The MAX phase ceramic can be Ti 3 AlC 2 , Get MXene material as Ti 3 C 2 .

[0038] (2) Preparation of nitrogen-doped carbon nanofiber-MXene composite material:

[0039] Take 1g of polyacrylonitrile and 1g of MXene prepared in step (1), put them in 10mL of N,N-dimethylformamide, stir for 12 hours, take a homogeneous solution and electrospin to prepare MXene doped polyacrylonitrile nano fiber. Subsequently, the prepared MXene-doped polyacrylonitrile nanofibers were placed in a tube furnace and calcined at 500° C. for 2 hours in an argon atmosphere, and then cooled in th...

Embodiment 3

[0043] (1) Preparation of MXene:

[0044] Dip the ground MAX phase ceramic powder into a 50% HF solution with a mass ratio of 1:10. The temperature is raised to 90°C and magnetically stirred for 24 hours. The product is obtained by centrifugation and deionized. Wash with water to neutral, place in an oven at 80°C and dry for 24 hours to obtain MXene. The MAX phase ceramic is Ti 3 AlC 2 , Get MXene material as Ti 3 C 2 .

[0045] (2) Preparation of nitrogen-doped carbon nanofiber-MXene composite material:

[0046] Take 2g of polyacrylonitrile and 2g of MXene prepared in step (1), put them in 20mL of N,N-dimethylformamide, stir for 24 hours, take a homogeneous solution and electrospin to prepare MXene doped polyacrylonitrile nano fiber. Subsequently, the prepared MXene-doped polyacrylonitrile nanofibers were placed in a tube furnace, and calcined at 1000° C. for 5 hours in an argon atmosphere, and then cooled in the furnace to obtain a nitrogen-doped carbon nanofiber-MXene composite...

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Abstract

The invention relates to a sulfur-nitrogen doped carbon nanofiber-MXene composite material for a lithium-sulfur battery and a preparation method thereof. Mxene doped polyacrylonitrile nanofiber is prepared by an electrospinning technology, a nitrogen-doped carbon nanofiber-MXene composite material is obtained by high-temperature carbonization, and the sulfur-nitrogen doped carbon nanofiber-MXene composite material is prepared through sulfur doping by a ball-milling and hot melting method. When the composite material obtained by preparation is used as the positive electrode material applied toa lithium-sulfur battery, lithium polysulfide can be effectively absorbed, and the beneficial effects of suppressing a shuttle effect and reducing volume expansion during the charge-discharge processare achieved.

Description

Technical field [0001] The technical scheme of the present invention relates to a method for preparing a lithium-sulfur battery positive electrode material with a high specific capacity, in particular to a method for preparing MXene-doped polyacrylonitrile nanofibers by an electrostatic spinning method, and then performing high-temperature calcination to obtain nitrogen doping The method of carbon nanofiber-MXene composite lithium-sulfur battery cathode material belongs to the field of material chemistry. Background technique [0002] With the successful commercial use of graphite anodes, lithium-ion batteries have been widely used in portable electronic devices such as smart phones, laptops, and so on. After more than 20 years of development, the existing lithium-ion batteries based on lithium-intercalation compound cathodes are close to their theoretical capacity, but they still cannot meet the requirements of the fast-developing electronics industry and emerging electric vehic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/052C01B32/907C01B32/15
CPCC01B32/15C01B32/907H01M4/362H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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