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Lithium-sulfur battery self-supporting cathode material and electro-spinning preparation method thereof

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, positive electrodes, etc., can solve the uncontrollable influence of electrode material flexibility factors, affect the electrochemical performance of lithium-sulfur batteries, and the poor conductivity of active material sulfur, etc. It can improve the electrochemical performance, alleviate the shuttle effect, and improve the chemical adsorption force.

Inactive Publication Date: 2019-11-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But lithium-sulfur batteries still have many challenging problems to be solved
The conductivity of the active substance sulfur is poor, the volume of the electrode material expands during the charge and discharge process, and the discharge intermediate product lithium polysulfide is easily soluble in the electrolyte, resulting in the loss of the active material and the shuttle effect, which eventually leads to a decrease in battery capacity and a shortened life. Bottlenecks in the commercial development of sulfur batteries
[0003] The prior art of lithium-sulfur battery cathode materials is disclosed. CN107633959A discloses a preparation method of lithium-sulfur cathode materials. An in-situ nitrogen-doped carbon fiber / magnesium oxide composite material is obtained by electrospinning. In-situ nitrogen-doped nanoporous carbon fiber electrode material is obtained by acid treatment and corrosion. The electrode material is obtained by grinding, slurrying and coating film. The preparation process is cumbersome, and conductive agents, binders, etc. need to be added. The introduction of these inactive electrode materials affects the electrochemical performance of lithium-sulfur batteries.

Method used

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  • Lithium-sulfur battery self-supporting cathode material and electro-spinning preparation method thereof
  • Lithium-sulfur battery self-supporting cathode material and electro-spinning preparation method thereof
  • Lithium-sulfur battery self-supporting cathode material and electro-spinning preparation method thereof

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preparation example Construction

[0028] A kind of electrospinning preparation method of lithium-sulfur battery self-supporting cathode material of the present invention, comprises the following steps:

[0029] (1) Dissolve polymethyl methacrylate (PMMA) directly in N,N-dimethylformamide, heat and stir evenly, then add polyacrylonitrile (PAN), heat and stir evenly, and obtain the precursor of electrospinning liquid.

[0030] (2) An electrospun fiber film containing polyacrylonitrile and polymethyl methacrylate was prepared by electrospinning and collected by a rotating shaft receiver.

[0031] (3) Pre-oxidizing and carbonizing the material obtained in step (2) to obtain an in-situ nitrogen-doped porous carbon fiber film.

[0032] (4) The in-situ nitrogen-doped porous carbon fiber film obtained in step (3) is immersed in a certain concentration of sulfur in a carbon disulfide solution, and after drying, heat treatment is carried out under an argon atmosphere to obtain a self-supporting lithium-sulfur battery p...

Embodiment 1

[0040] Step 1: Dissolve 0.2g polymethyl methacrylate (PMMA) in 10mL N,N-dimethylformamide, stir until dissolved evenly, then add 0.6g polyacrylonitrile (PAN), stir magnetically at 60°C , and stirred until the solution was bright yellow to obtain a spinning precursor.

[0041] Step 2: Set the parameters of electrospinning: the voltage is 14kV, the rotational speed of the rotating shaft receiver is 300r / min, the receiving distance is 15cm, and the advancing speed of the syringe is 2mm / h. After 8 hours of electrospinning, the electrospun fiber film can be obtained.

[0042] Step 3: Pre-oxidize the obtained electrospun fiber film at 220° C. for 1 hour in an air atmosphere in a tube furnace with a heating rate of 1° C. / min.

[0043] Step 4: Carbonize the pre-oxidized film at 600° C. for 2 hours under an argon atmosphere, with a heating rate of 5° C. / min. The in-situ nitrogen-doped porous carbon fiber film can be obtained.

[0044] Step 5: Prepare a sulfur-carbon disulfide soluti...

Embodiment 2

[0046] Step 1: Dissolve 0.2g polymethyl methacrylate (PMMA) in 10mL N,N-dimethylformamide, stir until dissolved evenly, then add 0.7g polyacrylonitrile (PAN), stir magnetically at 70°C , and stirred until the solution was bright yellow to obtain a spinning precursor.

[0047] Step 2: Set the parameters of electrospinning: the voltage is 15kV, the rotational speed of the rotating shaft receiver is 400r / min, the receiving distance is 16cm, and the advancing speed of the syringe is 3mm / h. After 8 hours of electrospinning, the electrospun fiber film can be obtained.

[0048]Step 3: Pre-oxidize the obtained electrospun fiber film at 280° C. for 1.5 h in an air atmosphere in a tube furnace with a heating rate of 1° C. / min.

[0049] Step 4: Carbonize the pre-oxidized film at 800° C. for 1.5 h under an argon atmosphere, with a heating rate of 5° C. / min. The in-situ nitrogen-doped porous carbon fiber film can be obtained.

[0050] Step 5: Prepare a sulfur-carbon disulfide solution w...

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Abstract

The invention provides a lithium-sulfur battery self-supporting cathode material and an electro-spinning preparation method thereof. Polyacrylonitrile and polymethyl methacrylate serve as precursors of electrostatic spinning yarns, composite nano-fiber membranes are prepared by an electro-spinning method, pre-oxidation and carbonization heat treatment of the electrostatic spinning fiber membranesare implemented to form a self-supporting in-situ nitrogen doped porous carbon nano-fiber structure, self-supporting in-situ nitrogen doped porous carbon nano-fiber membranes are soaked in carbon disulfide solution of sulfur, drying and heat treatment in the argon atmosphere are implemented to obtain the self-supporting lithium-sulfur cathode material. According to the material, the polymethyl methacrylate serves as a template agent, self-supporting in-situ nitrogen doped carbon nano-fibers with porous structures are formed in a heat treatment and pyrolysis manner, the loading capacity of thesulfur is improved, dissolution of polysulfide is restrained, and the nano-fibers can directly serve as electrode materials.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a lithium-sulfur battery self-supporting positive electrode material and an electrospinning preparation method thereof. Background technique [0002] With the development of electric vehicles and rechargeable portable devices, there are higher requirements for electrochemical energy storage systems. Due to its high theoretical specific capacity, high energy density, low cost, and environmental friendliness, lithium-sulfur batteries have attracted widespread attention and have great potential to become the next generation of energy storage systems. However, there are still many challenging problems to be solved in lithium-sulfur batteries. The conductivity of the active substance sulfur is poor, the volume of the electrode material expands during the charge and discharge process, and the discharge intermediate product lithium polysulfide is easily soluble ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/52D01F9/22D01F9/21H01M4/36H01M4/38H01M4/62H01M10/052D06M101/40
CPCD06M11/52D01F9/22D01F9/21H01M4/362H01M4/38H01M4/625H01M4/628H01M10/052D06M2101/40H01M2004/021H01M2004/028Y02E60/10
Inventor 欧阳海波黄启高李翠艳畅丽媛黄剑锋费杰许钊董继杰
Owner SHAANXI UNIV OF SCI & TECH
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