A kind of lithium-sulfur battery polymer barrier layer material and preparation method

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: 2020-09-22
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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  • A kind of lithium-sulfur battery polymer barrier layer material and preparation method
  • A kind of lithium-sulfur battery polymer barrier layer material and preparation method
  • A kind of lithium-sulfur battery polymer barrier layer material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) The carbon nanofiber membrane is made by electrospinning technology, prepare 3mg / ml polyacrylonitrile N,N-dimethylformamide solution, and suck it into the syringe as the spinning solution for electrospinning process; The silk equipment uses a voltage of 15kV, the distance between the syringe and the collector is adjusted to 15cm, and the required polyacrylonitrile membrane precursor is prepared after 2h.

[0034] (2) Put the polyacrylonitrile membrane precursor in a tube furnace, pretreat it in an air atmosphere at 280°C for 3h, then change it to a nitrogen atmosphere to carbonize it at 800°C for 2h to obtain the required carbon nanofiber membrane and cut it Into a round piece with a diameter of 1.4cm, its thickness is 25μm, and its mass is 0.2772mg, so its composite film mass is 0.18mg / cm 2 .

[0035] (3) Gum arabic was dissolved in distilled water to prepare a 7mg / ml solution.

[0036] (4) According to the mass ratio of carbon nanofiber membrane and gum arabic at 1:1, d...

Embodiment 2

[0039] (1) Dissolve polyacrylonitrile in N,N-dimethylformyl solvent, prepare a 2mg / ml polyacrylonitrile solution, and prepare polyacrylonitrile film precursors by electrospinning;

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

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

[0042] (4) According to the mass ratio of carbon nanofiber membrane to gum arabic at 1.5:1, drop 40 μl of gum arabic solution on the carbon nanofiber membrane;

[0043] (5) Vacuum drying at 70°C for 20 hours, other conditions are as in Example 1, the thickness of the carbon nanofiber-gum arabic composite film prepared is 19 μm, and the composite film mass is 0.25 mg / cm 2 .

Embodiment 3

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

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

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

[0048] (4) According to the mass ratio of carbon nanofiber membrane and gum arabic at 2:1, drop 28.7 μl of gum arabic solution on the carbon nanofiber membrane;

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

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Abstract

The invention relates to a lithium-sulfur battery polymer barrier layer material and a preparation method, preparing a N,N-dimethylformamide solution of 1-3mg / ml polyacrylonitrile, and preparing a carbon nanofiber precursor by electrospinning film; carbonize the precursor film at 800-1000°C in nitrogen to form a carbon nanofiber film; dissolve the natural polymer gum arabic in water to prepare a solution; directly drop the gum arabic solution on the carbon nanofiber film to form a carbon nanofiber film Fiber-gum arabic composite film; vacuum-dry the above-mentioned composite film at 60-80°C for 16-24h, its thickness is 17-25μm, and its mass is 0.18-0.36mg / cm 2 . The invention realizes the excellent cycle performance of maintaining 94% capacity after 250 cycles of the lithium-sulfur battery, alleviates the problem of "shuttle effect" of lithium polysulfide, and meanwhile the battery also exhibits excellent anti-self-discharge capability.

Description

Technical field [0001] The invention relates to a lithium-sulfur battery polymer barrier layer material and a preparation method, and belongs to the technical field of electrochemical energy storage. Background technique [0002] With the rapid development of electric vehicles, portable electronic devices, and smart grids, the search for 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, there are several serious problems in lithium-sulfur batteries that hinder its practical application: 1. The elemental sulfur and its final discharge product, lithium sulfide, are both poor conductors of electrons. On the one hand, the utilization rate of the positive electrode active material is low and the rate perfo...

Claims

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Application Information

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Patent Type & Authority Patents(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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