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Composite membrane for lithium-air battery

A lithium-air battery and composite membrane technology, which is applied to battery components, circuits, fuel cell-type half-cells and primary battery-type half-cells, etc. problems, to achieve excellent mechanical properties, improve cycle stability, reduce corrosion effects

Inactive Publication Date: 2014-03-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The third is how to prevent CO when used in the air 2 And water vapor enters the battery, causing the electrolyte to deteriorate and generate Li 2 CO 3 (It does not have electrochemical reversibility, which reduces the cycle performance of the battery)
Despite the efforts of developers, the problem remains serious

Method used

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  • Composite membrane for lithium-air battery
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  • Composite membrane for lithium-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1 g of polyethylene glycol (molecular weight 50,000) was dissolved in 25 ml of acetonitrile, 0.32 g of lithium bis(trifluoromethylsulfonyl)imide, 0.05 g of silica nanoparticles (particle size 20 nm) and 0.35 gram of methylbutylpiperidine bis(trifluoromethylsulfonyl)imide salt ionic liquid, stirred at room temperature for 12 hours, and sonicated for 10 minutes to obtain a uniform slurry; next, a polypropylene film (thickness 120 μm, porosity 80%) immersed in the above slurry, take it out after 8 hours, and dry it under vacuum at 50°C for 24 hours.

[0041] use Figure 1a The shown setup tests the oxygen permeation properties of the above composite membranes and common polypropylene separators. The device is a closed container, which is divided into three interconnected cavities (A, B and C respectively). The two diaphragms to be compared are placed between the cavities A, B and B, C respectively. Cavities A, B, B, and C are separated by two diaphragms, and under the pro...

Embodiment 2

[0044] 1 g of vinylidene fluoride-hexafluoropropylene copolymer was dissolved in 30 ml of tetrahydrofuran, and 0.3 g of lithium bis(trifluoromethylsulfonyl)imide, 0.02 g of zirconia nanoparticles (particle size 20 nm) and 0.35 gram of methylbutylpiperidine bis(trifluoromethylsulfonyl)imide salt ionic liquid, stirred at room temperature for 12 hours, and ultrasonically treated for 10 minutes to obtain a uniform slurry; next, a piece of polytetrafluoroethylene porous membrane ( Thickness of 120 microns, porosity of 80%) was immersed in the above slurry, taken out after 12 hours, and vacuum dried at 40°C for 24 hours to obtain a composite separator.

[0045] use Figure 1a The oxygen permeation rate of the membrane is tested by the method, and its value is 52% of that of ordinary polypropylene separator.

[0046] The lithium-air battery assembled with this film can run for 3 cycles, and the battery test conditions are the same as in Example 1

Embodiment 3

[0048] 0.5 g of methyl methacrylate was dissolved in 20 ml of tetrahydrofuran, to which 0.3 g of lithium hexafluorophosphate, 0.02 g of manganese dioxide nanoparticles (particle size 10 nm) and 0.35 g of methylbutylpyrrolidine bis(trifluoromethylsulfonium) were added Acyl) imide salt ionic liquid, stirred at room temperature for 15 hours, and ultrasonically treated for 10 minutes to obtain a uniform slurry; The above slurry was taken out after 12 hours, and dried under vacuum at 40° C. for 24 hours.

[0049] The lithium-air battery assembled with the obtained composite film can run for 2 cycles, and the battery test conditions are the same as in Example 1

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Abstract

The invention relates to a composite membrane for a lithium-air battery. The composite membrane comprises a polymer porous supporting body, a lithium ion conductive polymer, inorganic nano-particles and hydrophobic ion liquid. The membrane has a function of conducting lithium ions, and can effectively inhibit oxygen dissolved in electrolyte from permeating through the membrane, so that corrosion of oxygen to a cathode lithium chip can be prevented, and the circulating stability of a battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-air batteries, and in particular relates to a composite membrane for lithium-air 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 reache...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/446H01M50/489H01M50/491H01M50/497
CPCH01M12/06H01M50/409Y02E60/10
Inventor 张华民张凤祥张益宁
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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