Diaphragm of lithium-sulfur battery

A lithium-sulfur battery and diaphragm technology, applied in the field of composite membranes for lithium-sulfur batteries, can solve the problems of low conductivity and strength of the gel electrolyte diaphragm, reduced electrolyte conductivity, loss of positive active materials, etc., and achieve the suppression of the "shuttle" effect , Improve battery efficiency and stability, and high storage capacity

Active Publication Date: 2014-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Despite the above advantages, lithium-sulfur batteries are still far from being practical. The current main problems include: (1) The lithium metal in the negative electrode reacts with the sulfur dissolved in the electrolyte, and the elemental sulfur gradually shrinks in the positive electrode area and forms Polysulfide, polysulfide strips from the positive electrode and enters the electrolyte, and then reacts with metal lithium, the positive electrode active material is lost and eroded, and finally causes the positive electrode area to collapse; (2) During the discharge process of the lithium-sulfur battery, the formed polysulfide After the sulfides enter the electrolyte, t

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Examples

Experimental program
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Example Embodiment

[0024] Example 1:

[0025] Dissolve 0.25 g of sulfonated polyether ether ketone, 0.5 g of polyvinylidene fluoride, and 0.1 g of lithium chloride in 6 ml of N,N-dimethylformamide. The resulting solution is allowed to stand for deaeration and then cast at 30°C. Scrape on the platform, the thickness of the liquid film is 500 microns; after 30 minutes, transfer the liquid film together with the bottom plate into a room temperature water bath for 30 minutes to complete the phase transition, then separate the membrane from the bottom plate, and repeatedly soak and rinse with deionized water , In order to completely remove the solvent inside the membrane; then treated with a 0.5M lithium hydroxide aqueous solution (25°C, 12 hours) to form the lithium sulfonic acid group in the membrane; repeatedly washed with deionized water at 70°C Vacuum drying for 24 hours.

[0026] The composite membrane obtained above was used to assemble a lithium-sulfur button battery. The positive electrode was a...

Example Embodiment

[0028] Example 2:

[0029] Dissolve 0.4 g of sulfonated polyether ether ketone, 0.6 g of polyvinylidene fluoride, and 0.2 g of lithium chloride in 8 ml of N,N-dimethylformamide, and the resulting solution was allowed to stand and degassed and then cast at 40°C. Scrape on the platform, the thickness of the liquid film is 280 microns; after 20 minutes, transfer the liquid film together with the bottom plate to a room temperature water bath for 30 minutes to complete the phase transition, then separate the membrane from the bottom plate, and repeatedly soak and rinse with deionized water , In order to completely remove the solvent inside the membrane; then treated with a 0.5M lithium hydroxide aqueous solution (25°C, 12 hours) to form the lithium sulfonic acid group in the membrane; repeatedly washed with deionized water at 70°C Vacuum drying for 24 hours.

[0030] The composite membrane obtained above was used to assemble a lithium-sulfur button battery. The positive electrode was a...

Example Embodiment

[0031] Example 3:

[0032] Add 0.504 g of polyvinylidene fluoride to 12 ml of Nafion’s N,N-dimethylformamide solution, and then add 0.2 g of lithium chloride, dissolve it completely after stirring, and let it stand for deaeration and then cast it on a film platform at 60℃ The thickness of the liquid film is 280 microns; after 100 minutes, the liquid film and the bottom plate are transferred to a room temperature water bath to soak for 30 minutes to complete the phase transition, and then the membrane and the bottom plate are separated, soaked and rinsed repeatedly with deionized water. Thoroughly remove the solvent inside the membrane; then treat it with a 0.5M lithium hydroxide aqueous solution (25°C, 12 hours) to form the lithium sulfonic acid group in the membrane; repeatedly wash with deionized water and then vacuum dry at 70°C 24 hours.

[0033] The composite membrane obtained above was used to assemble a lithium-sulfur button battery. The positive electrode was a carbon-sulf...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries and in particular relates to a composite membrane of a lithium-sulfur battery. The composite membrane is a negative ion type composite multi-stage porous diaphragm and comprises a mixture of a negative charge ionization polymer and a lithium ion conduction polymer, wherein the composite multi-stage porous diaphragm has a macropore channel structure of 50 nanometers to 2 microns; micropores of 1-50 nanometers are formed in the side walls of macropore channels; the porosity is 50%-80%; macro pores account for 40%-70% of all pores and the rest pores are micropores. The composite multi-stage porous diaphragm provided by the invention has the characteristics and the beneficial effects that the macro pores of the composite membrane are good in electrolyte solution absorption and storage capacity, and the micropores are connected with the macro pores, so that the conduction of lithium ions can be facilitated; polysulfide negative ions can be excluded under the charge effect of the composite membrane material to a certain extent, so that the shuttle effect is inhibited, the loss of active substances is reduced, and the battery efficiency and stability are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a composite membrane for lithium-sulfur batteries. Background technique [0002] With the continuous development of economy and society, energy and environmental problems are becoming more and more serious. Energy conservation and emission reduction, development and utilization of new energy and renewable energy, and development of efficient and clean energy conversion and storage technologies are important issues and challenges for today's society, science and technology, and industry. In recent years, lithium batteries with metallic lithium as the negative electrode, including lithium-air batteries and lithium-sulfur batteries, have received great attention because metallic lithium has the lowest density, the most negative electrode potential, the best electronic conductivity and The highest electrochemical equivalent, its electrochemical capacity ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/411H01M50/491
CPCH01M10/052H01M50/411Y02E60/10
Inventor 张华民张凤祥曲超
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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