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Water-proof and oxygen-permeable layer of metal air battery based on perfluorocarbon

A metal-air battery, waterproof and oxygen-permeable layer technology, applied in fuel cell half-cells and primary battery-type half-cells, etc., can solve problems affecting battery cycle performance, oxygen mass transfer polarization, metal negative electrode corrosion, etc. Achieve the effects of improving oxygen transmission capacity, preventing H2O and CO2 from entering, and simple operation

Inactive Publication Date: 2018-08-21
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

h 2 O will cause corrosion of the metal anode, while CO 2 It will react with the metal negative electrode to generate some by-products, which will affect the battery cycle performance
The current method is to add a waterproof membrane, which can suppress the H in the air 2 O and CO 2 etc. into the interior of the battery, but at the same time there is mass transfer polarization of oxygen

Method used

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  • Water-proof and oxygen-permeable layer of metal air battery based on perfluorocarbon
  • Water-proof and oxygen-permeable layer of metal air battery based on perfluorocarbon
  • Water-proof and oxygen-permeable layer of metal air battery based on perfluorocarbon

Examples

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Effect test

Embodiment 1

[0019] Take 60% PTFE solution, add absolute ethanol to dilute it into 5%-30% PTFE solution, and brush the diluted PTFE solution on one side of the nickel foam with a thickness of 0.5-1mm and a diameter of 8-20mm. Dry at ~80°C for 5-60 minutes, brush again, and repeat this many times. Then put the nickel foam into a tube furnace for sintering at 200-350°C for 0.5-2 hours. Finally, apply a layer of perfluorodecalin or perfluorooctane (10-200 μL) by spraying, dripping or other methods to obtain a waterproof and oxygen-permeable layer.

Embodiment 2

[0021] Put conductive carbon material (KB, Super P, acetylene black, etc.) and PTFE solution in a beaker at a ratio of 6:4 to 9:1, add absolute ethanol and isopropanol, and perform ultrasonic stirring for 1 to 10 hours until the formation of viscous. Then roll it into a film with a pair of rollers, with a thickness of 0.5-2 mm. Afterwards, the film is put into a tube furnace for sintering at 200-350°C for 0.5-2 hours. Finally, apply a layer of perfluorodecalin or perfluorooctane (10-200 μL) by spraying, dripping or other methods to obtain a waterproof and oxygen-permeable layer.

Embodiment 3

[0023] Assemble lithium-air batteries in a glove box filled with argon, and the electrolyte is 0.5-2M lithium bistrifluoromethanesulfonimide (LiTFSI), or lithium trifluoromethanesulfonate (LiTf), or LiNO 3 , or LiClO 4 Soluble in solvents such as ethylene glycol dimethyl ether (DME), tetraethylene glycol dimethyl ether (TEGDME) or dimethyl sulfoxide (DMSO). The air electrode is a conductive carbon material (KB, SuperP, acetylene black, etc.) and an oxygen electrode catalyst (metal oxide, carbide, noble metal, etc.). The diaphragm is glass fiber filter paper, and the negative electrode material is lithium sheet with a diameter of 8-12 mm. The specific operation steps are: put the waterproof and oxygen-permeable layer into the positive electrode shell, then put the air electrode and diaphragm, add the electrolyte dropwise, then put the lithium sheet, gasket, shrapnel in sequence, and finally put the negative electrode shell.

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Abstract

The invention relates to a water-proof and oxygen-permeable layer of a metal air battery based on perfluorocarbon. The water-proof and oxygen-permeable layer mainly comprises a substrate, a binding agent and perfluorocarbon. Perfluorocarbon can be perfluorooctane, perfluorodecalin and the like. A preparation method of the layer is simple to operate; compared with the traditional water-proof membrane, since perfluorocarbon is added, impurities such as H2O and CO2 in air can be prevented from entering the battery; the oxygen transfer capacity of an oxygen electrode can also be increased; the layer achieves water-proof and oxygen-permeable functions; and therefore, the electrochemical performance of the metal air battery is improved.

Description

(1) Technical field [0001] The invention relates to a waterproof and oxygen-permeable layer of a metal-air battery, in particular to a waterproof and oxygen-permeable layer of a metal-air battery based on perfluorocarbons. (2) Background technology [0002] With the progress of the times and the development of the economy, the demand for energy is also increasing. Traditional fossil fuels can no longer meet human needs, so there is an urgent need for the emergence of renewable energy. Lithium-ion batteries, first commercialized in 1991, are widely used in portable electronic devices due to their high energy density and long life. However, due to the limitations of the internal reaction mechanism of the lithium-ion battery system, it is far from meeting the high specific energy requirements of new power vehicles. [0003] In contrast, the metal-air battery is a secondary battery in which the metal is used as the negative electrode, the air electrode is used as the positive e...

Claims

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Application Information

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IPC IPC(8): H01M12/06
CPCH01M12/06
Inventor 宋世栋孙建于利梅陈步天秦旭辉李婉君汪兵辉王亮平
Owner TIANJIN POLYTECHNIC UNIV
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