Preparation method of waterproof gas-permeable film for lithium-air battery

A technology of waterproof breathable film and film former, which is applied in the direction of battery pack components, fuel cell half-cells and secondary battery-type half-cells, circuits, etc., which can solve the problem of affecting battery discharge capacity, service life and safety , can not fully represent the application of lithium-air batteries, the increase of battery impedance and other problems, to achieve the effect of good waterproof and breathable performance, moderate strength, and satisfying the amount of oxygen

Pending Publication Date: 2020-12-11
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Since the lithium-air battery works in an open environment, the usual organic electrolyte is easy to volatilize through the air electrode, which directly leads to a rapid increase in battery impedance, and the lithium salt is also easy to decompose by moisture absorption, which affects the discharge capacity, service life and safety
Therefore, the current lithium-air batteries reported in the literature are usually charged and discharged in dry pure oxygen. Strictly speaking, this battery should be called a lithium-oxygen battery because it avoids the H 2 O.CO 2 Difficulty of intrusion, not fully representative of practical Li-air battery applications

Method used

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  • Preparation method of waterproof gas-permeable film for lithium-air battery

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Experimental program
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Effect test

Embodiment 1

[0035] Weigh 40g of white oil and 5g of high-density polyethylene, put them into a beaker, put the beaker into an oil bath preheated at 150°C, and stir magnetically until the high-density polyethylene is melted to obtain a film-forming slurry. Pour the film-forming slurry into the film-forming device, and obtain an oil-containing film after cooling. Put the oil-containing film into the dichloromethane extractant, and extract the white oil in it after repeated extractions. The extracted film is placed in a drying oven at a temperature of 30°C, and the extractant on the surface and inside of the film is volatilized and removed to obtain a waterproof and breathable film.

Embodiment 2

[0037] Weigh 40g of white oil and 5g of linear low-density polyethylene, put them into a beaker, put the beaker into an oil bath preheated at 130°C, and stir magnetically until the linear low-density polyethylene melts to obtain a film-forming slurry. Pour the film-forming slurry into the film-forming device, and obtain an oil-containing film after cooling. Put the oil-containing film into the dichloromethane extractant, and extract the white oil in it after repeated extractions. The extracted film is placed in a drying oven at a temperature of 30°C, and the extractant on the surface and inside of the film is volatilized and removed to obtain a waterproof and breathable film.

Embodiment 3

[0039] Weigh 40g of white oil and 5g of amorphous α-olefin copolymer, put them into a beaker, put the beaker into an oil bath preheated at 170°C, and stir magnetically until the amorphous α-olefin copolymer melts to obtain Film-forming slurry. Pour the film-forming slurry into the film-forming device, and obtain an oil-containing film after cooling. Put the oil-containing film into the dichloromethane extractant, and extract the white oil in it after repeated extractions. The extracted film is placed in a drying oven at a temperature of 30°C, and the extractant on the surface and inside of the film is volatilized and removed to obtain a waterproof and breathable film.

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Abstract

The invention relates to a preparation method of a waterproof gas-permeable film for a lithium-air battery. The method comprises the following steps: melting polyolefin in white oil, forming a film, extracting, and drying to obtain the waterproof gas-permeable film. According to the invention, the compact waterproof gas-permeable film with adjustable thickness is prepared by controlling the concentration of polyolefin, the temperature in the film forming process and other conditions; and the button lithium air battery prepared from the waterproof gas-permeable film has strong environmental adaptability, is suitable for working in the air, and can continuously discharge for more than 1200 hours in the air environment under the current density of 0.1 mA/cm<2>.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-air batteries, and in particular relates to a preparation method of a waterproof and breathable membrane for lithium-air batteries. Background technique [0002] With the increasing shortage of fossil resources such as oil and coal and the increasing environmental pollution, the development and utilization of new green energy has become an urgent task for the development of human society. It is imperative to vigorously develop energy systems and materials with high power density and energy density. Lithium-air batteries use metal lithium with the highest electrochemical equivalent (3860mAh / g) and the most negative potential (standard potential of -3.05V) and oxygen in the air around the battery as active materials, with a theoretical specific energy of 5.21kWh / kg (including Oxygen) or 11.14k Wh / kg (excluding oxygen), 1 to 2 orders of magnitude higher than the existing lithium-ion battery sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J5/18H01M2/02H01M12/08C08L23/06C08L23/08C08L23/02
CPCC08J5/18C08J9/28C08J2323/02C08J2323/06C08J2323/08H01M12/08
Inventor 谢晓华石斌王畅张建夏保佳
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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