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Fiber meshed modified lithium sulfur battery diaphragm and preparation method and application thereof

A lithium-sulfur battery, fiber mesh technology, applied in the field of lithium-sulfur battery modified diaphragm and its preparation, can solve the problems of poor electrolyte wettability, fast battery capacity decay, high electrochemical impedance, etc., and achieve excellent electrochemical performance , Inhibit capacity attenuation, increase wettability

Active Publication Date: 2019-04-16
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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  • Fiber meshed modified lithium sulfur battery diaphragm and preparation method and application thereof
  • Fiber meshed modified lithium sulfur battery diaphragm and preparation method and application thereof
  • Fiber meshed modified lithium sulfur battery diaphragm and preparation method and application thereof

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), and stir magnetically for 2 h to 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 speed...

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 lithium sulfur battery diaphragms, in particular to a fiber meshed modified lithium sulfur battery diaphragm and a preparation method thereof. The fibermeshed modified lithium sulfur battery diaphragm is obtained by arranging a Nafion / polyacrylic acid fiber layer on a commercial diaphragm and carrying out heat treatment and lithium treatment sequentially. The fiber meshed modified lithium sulfur battery diaphragm prepared in the invention has good electrolyte wettability, small impedance and the ability of fast lithium ion conduction, and can prevent the shuttle of polysulfides. Therefore, excellent electrochemical performance is achieved in the application to lithium-sulfur batteries, the capacity attenuation of lithium-sulfur batteries isinhibited, and the service life of batteries is prolonged. In addition, the electro-spinning technology used in the preparation process is simple, the degree of automation and the production efficiency are high, and the diaphragm is easy to scale up and produce.

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 Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525D04H1/4382D04H1/728D06B3/10D06B15/00H01M50/403H01M50/44H01M50/454H01M50/457H01M50/497
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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