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Polymer blocked layer material for lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery and polymer technology, applied in the field of electrochemical energy storage, can solve the problems of complicated operation and expensive raw materials, and achieve the effects of simple operation, cheap raw materials, and excellent anti-self-discharge capability.

Active Publication Date: 2019-02-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the "shuttle effect" of lithium polysulfide and the contradiction between high sulfur loading and cycle life in the prior art, complicated operation and expensive raw materials, etc.

Method used

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  • Polymer blocked layer material for lithium-sulfur battery and preparation method thereof
  • Polymer blocked layer material for lithium-sulfur battery and preparation method thereof
  • Polymer blocked layer material for lithium-sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Carbon nanofiber film adopts electrospinning technology to make, prepares the N,N-dimethylformamide solution of 3mg / ml polyacrylonitrile, inhales it in the syringe and treats the electrospinning procedure as spinning solution; The wire equipment uses a voltage of 15kV, the distance between the injector and the collector is adjusted to 15cm, and the required polyacrylonitrile film precursor is prepared after 2 hours.

[0034] (2) Put the precursor film in a tube furnace, pretreat it in air atmosphere at 280°C for 3h, then replace it with nitrogen atmosphere at 800°C for 2h carbonization, you can get the required carbon nanofiber film, cut it into a diameter of A 1.4cm circular piece has a thickness of 25μm and a mass of 0.2772mg, so its surface mass is 0.18mg / cm 2 ,.

[0035] (3) Dissolve gum arabic in distilled water to prepare a 7 mg / ml solution.

[0036] (4) According to the mass ratio of the carbon nanofiber membrane and the gum arabic being 1:1, add 39.5 μl of...

Embodiment 2

[0039] (1) dissolving polyacrylonitrile in N, N-dimethylformyl solvent, configuring a solution of 2 mg / ml polyacrylonitrile, and preparing a polyacrylonitrile film precursor by electrospinning;

[0040] (2) Carbonize the precursor film in a nitrogen atmosphere at 900°C for 2.5 hours to obtain the desired carbon nanofiber film, which is cut into circular pieces with a diameter of 1.6 cm, a thickness of 19 μm, and a mass of 0.3 mg. Its surface quality is 0.15mg / cm 2 .

[0041] (3) Dissolve gum arabic in distilled water to prepare a 5 mg / ml solution.

[0042] (4) According to the mass ratio of carbon nanofiber membrane and gum arabic being 1.5:1, 40 μl of gum arabic solution is added dropwise on the carbon nanofiber membrane;

[0043] (5) Vacuum drying at 70°C for 20 hours, other conditions as in Example 1, the thickness of the prepared carbon nanofiber-gum arabic composite film is 19 μm, and the surface weight is 0.25 mg / cm2 .

Embodiment 3

[0045] (1) dissolving polyacrylonitrile in N,N-dimethylformyl solvent, configuring a solution of 1 mg / ml polyacrylonitrile, and preparing a polyacrylonitrile film precursor by electrospinning;

[0046] (2) Carbonize the precursor film in a nitrogen atmosphere at 1000°C for 3 hours to obtain the desired carbon nanofiber film, which is cut into circular pieces with a diameter of 1.5 cm, a thickness of 17 μm, and a mass of 0.21 mg. The mass is 0.12mg / cm 2 .

[0047] (3) Dissolve gum arabic in distilled water to prepare a 4 mg / ml solution.

[0048] (4) According to the mass ratio of carbon nanofiber membrane and gum arabic is 2:1, 28.7 μ l of gum arabic solution is added dropwise on the carbon nanofiber membrane;

[0049] (5) Vacuum drying at 80°C for 16 hours, other conditions as in Example 1, the thickness of the prepared carbon nanofiber-gum arabic composite film is 17 μm, and the surface weight is 0.18 mg / cm 2 .

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Abstract

The invention relates to a polymer blocked layer material for a lithium-sulfur battery and a preparation method thereof. The preparation method comprises the following steps: preparing 1-3mg / ml of N,N-dimethyl formamide of polyacrylonitrile, and preparing a nano-fiber precursor membrane by adopting an electrostatic spinning method; carbonizing the precursor membrane in nitrogen at 800-1000 DEG C to form a carbon nano-fiber membrane; dissolving natural polymer acacia gum in water to prepare a solution; directly dropwise adding the acacia gum onto the carbon nano-fiber membrane to form a carbonnano-fiber-acacia gum composite membrane; drying the composite membrane in vacuum at 60-80 DEG C for 16-24 hours to enable the composite membrane to have a thickness of 17-25mu m and mass of 0.18-0.36mg / cm<2>. By adopting the method, the excellent circulating performance that a lithium-sulfur battery has 94 percent volume after circulating for 250 times is realized, the 'shuttle effect' problem oflithium polysulfide can be relieved, and the battery shows excellent self-discharge resistance.

Description

technical field [0001] The invention relates to a lithium-sulfur battery polymer barrier layer material and a preparation method, belonging to the technical field of electrochemical energy storage. Background technique [0002] With the rapid development of electric vehicles, portable electronic devices, and smart grids, seeking energy storage systems with high energy density is the only way to meet market demand. Lithium-sulfur batteries have extremely high energy density (2600Wh / kg), and sulfur has the advantages of abundant reserves on the earth, low price and environmental friendliness, so it has received extensive attention from researchers. However, several serious problems in lithium-sulfur batteries hinder its practical application: 1. Both sulfur and its final discharge product, lithium sulfide, are poor conductors of electrons, which on the one hand result in low utilization of positive active materials and poor rate performance On the other hand, the sulfur conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M50/403H01M50/446H01M50/489
CPCH01M10/052H01M50/403H01M50/461H01M50/46Y02E60/10
Inventor 涂水彬赵鑫鑫程明仁许运华
Owner TIANJIN UNIV
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