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A kind of fibrous mesh lithium-sulfur battery modified diaphragm and its preparation method and application

A lithium-sulfur battery, fiber mesh technology, applied in the field of lithium-sulfur battery modified separator and its preparation, can solve the problems of poor electrolyte wettability, rapid battery capacity decay, loss of active material, etc., and achieve excellent electrochemical performance, The effect of suppressing capacity fading and high production efficiency

Active Publication Date: 2021-05-11
河南景创新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in the loss of active materials and the corrosion of lithium in the negative electrode, which is also the main reason for the fast decay of battery capacity and low cycle life.
In addition, these commercial separators are all non-polar materials, which have poor wettability to the electrolyte, resulting in high electrochemical impedance

Method used

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  • A kind of fibrous mesh lithium-sulfur battery modified diaphragm and its preparation method and application
  • A kind of fibrous mesh lithium-sulfur battery modified diaphragm and its preparation method and application
  • A kind of fibrous mesh lithium-sulfur battery modified diaphragm and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of the modified diaphragm of the fiber mesh lithium-sulfur battery, the specific steps are as follows:

[0035] 1) Dissolve 0.5 g of polyacrylic acid powder in a mixed solvent of 9.5 g of water and n-propanol, the mass ratio of solvent water and n-propanol is 5:1, stir magnetically for 2 h, mix well, and the solution is transparent and colorless;

[0036] 2) Add 10 g of the commercial Nafion solution with a mass fraction of 5% to the polyacrylic acid solution in 1), stir magnetically for 2 hours and mix evenly, and the solution is transparent and colorless. After stopping the stirring, let it stand for 10 h to remove the air bubbles in the solution.

[0037] 3) The Nafion / polyacrylic acid mixed solution obtained in 2) was injected into a 5 ml medical syringe, placed in an electrospinning device, and spun at an injection speed of 0.3 ml / h and a voltage of 7 kV. A layer of commercial polyethylene diaphragm was wound on the roller receiver, the roller spee...

Embodiment 2

[0045] The preparation of the modified diaphragm of the fiber mesh lithium-sulfur battery, the steps are as follows:

[0046] 1) Dissolve 0.6 g of polyacrylic acid powder in a mixed solvent of 6.9 g of water and n-propanol, the ratio of solvent water and n-propanol is 4:1, stir magnetically for 3 h, mix well, and the solution is transparent and colorless;

[0047] 2) Add 8 g of the commercial Nafion solution with a mass fraction of 10% to the polyacrylic acid solution in 1), stir magnetically for 3 h and mix evenly, the solution is transparent and colorless; after stopping the stirring, let stand for 12 h to remove the bubbles in the solution;

[0048] 3) The Nafion / polyacrylic acid mixed solution obtained in 2) was injected into a 5 ml medical syringe, placed in an electrospinning device, and spun at an injection speed of 0.5 ml / h and a voltage of 8 kV. A layer of commercial polyethylene diaphragm was wound on the roller receiver, the roller speed was 50 r / min, and the distan...

Embodiment 3

[0053] The preparation of the modified diaphragm of the fiber mesh lithium-sulfur battery, the steps are as follows:

[0054] 1) Dissolve 0.6 g of polyacrylic acid powder in a mixed solvent of 4.4 g of water and n-propanol, the ratio of solvent water and n-propanol is 1:1, stir for 4 h under magnetic force, mix well, and the solution is transparent and colorless;

[0055] 2) Add 5 g of the commercial Nafion solution with a mass fraction of 5% to the polyacrylic acid solution in 1), stir magnetically for 6 h and mix evenly, the solution is transparent and colorless; after stopping the stirring, let stand for 15 h to remove the bubbles in the solution;

[0056] 3) The Nafion / polyacrylic acid mixed solution obtained in 2) was injected into a 5 ml medical syringe, placed in an electrospinning device, and spun at an injection speed of 0.5 ml / h and a voltage of 10 kV. A layer of commercial polypropylene diaphragm was wound on the roller receiver, the roller speed was 50 r / min, and t...

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Abstract

The invention belongs to the technical field of diaphragms for lithium-sulfur batteries, and in particular relates to a fiber mesh-shaped modified diaphragm for lithium-sulfur batteries and a preparation method thereof. The diaphragm is obtained by disposing a Nafion / polyacrylic acid fiber layer on the commercial diaphragm, followed by heat treatment and lithiation treatment in sequence, to obtain the modified diaphragm of the fiber mesh lithium-sulfur battery. The fiber mesh modified diaphragm prepared by the present invention has good electrolyte wettability, small impedance, fast lithium ion conductivity, and can effectively prevent the shuttling of polysulfides, so it is used in lithium-sulfur batteries. In the application, the excellent electrochemical performance is achieved, the attenuation of the capacity of the lithium-sulfur battery is suppressed, and the service life of the battery is prolonged. In addition, the electrospinning technology used in the preparation process is simple, has a high degree of automation, high production efficiency, and is easy to scale up production.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery separators, and in particular relates to a fibrous mesh modified lithium-sulfur battery separator and a preparation method and application thereof. Background technique [0002] In recent years, the new energy industry has developed rapidly, new energy sources such as photovoltaics and wind power have maintained rapid growth, and the level of industrialization has gradually improved, resulting in a continuous decline in power generation costs. On the other hand, with the development of a new generation of electronic products and the electric vehicle industry, traditional energy storage systems can no longer meet people's needs. Therefore, the research and development of next-generation high-energy-density storage systems is imminent. With a series of advantages such as high theoretical energy density (2600 Wh / kg), low cost, and low pollution, lithium-sulfur batteries have the poten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/44H01M50/417H01M10/0525D04H1/4382D04H1/728D06B3/10D06B15/00H01M50/454H01M50/457H01M50/497
CPCH01M10/0525D04H1/4382D04H1/728D06B3/10D06B15/00H01M50/411H01M50/44H01M50/403Y02E60/10
Inventor 王景涛高森王俊晓刘咏高瑞霞
Owner 河南景创新能源科技有限公司
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