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Waterproof breathable film of magnesium metal air battery and continuous coating preparation method thereof

A technology of waterproof breathable membrane and air battery, which is applied in battery electrodes, fuel cell half-cells, primary battery half-cells, fuel cell half-cells and secondary battery-type half-cells, etc., and can solve many problems It is difficult to realize the waterproof and breathable electrode materials, the uneven waterproof and breathable effect of the film layer, and the uneven distribution of waterproof and breathable materials, so as to ensure the uniformity and consistency of performance, uniform thickness and uniform distribution.

Inactive Publication Date: 2021-04-20
CHANGSHA XUNYANG NEW MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned waterproof and breathable membrane produced by the sheet method is likely to cause uneven distribution of waterproof and breathable materials on the surface of the current collector of the electrode, which cannot be continuously produced. The waterproof and breathable effect of the film layer is uneven, and it is difficult to realize the two key characteristics of waterproof and breathable electrode materials. the unity of

Method used

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  • Waterproof breathable film of magnesium metal air battery and continuous coating preparation method thereof
  • Waterproof breathable film of magnesium metal air battery and continuous coating preparation method thereof
  • Waterproof breathable film of magnesium metal air battery and continuous coating preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] S1: Choose the carbon-based material of the waterproof and breathable membrane: 1 μm spherical dense graphite, 100 μm porous activated carbon, with a purity of 99%; choose the bonding agent in the waterproof and breathable membrane: polytetrafluoroethylene emulsion (PTFE) and carboxymethyl fiber (CMC) mixing; the carbon-based material powder is weighed in proportion, spherical graphite 50%, porous activated carbon 50%, mix uniformly in a three-dimensional mixer, and the mixing time is 30min, and the carbon-based solid phase powder after mixing Mixed with the binder, the ratio is: 30% of carbon-based solid phase powder, 70% of binder, to obtain a mixed material.

[0041] S2: Add distilled water to the mixed material, the addition of water accounts for 50% of the total slurry, mix and stir to obtain a uniform slurry, the stirring speed is 200 rpm, the stirring time is 30min, and the viscosity of the mixed slurry is controlled at 5000mPa ·s.

[0042] S3: The slurry is put...

Embodiment 2

[0046] S1: Select the carbon-based material of the waterproof and breathable membrane: 100μm flake graphite, 1μm carbon black, with a purity of 99%; choose the bonding agent in the waterproof and breathable membrane: polyvinylidene fluoride (PVDF) and styrene-butadiene rubber emulsion (SBR) Mixing: Weigh the carbon-based material powder in proportion, 70% of flake graphite and 30% of carbon black, and mix them evenly in a three-dimensional mixer. The mixing time is 120min, and the mixed carbon-based solid phase powder and bonding Auxiliaries are mixed, and the ratio is: 90% of carbon-based solid-phase powder and 10% of binder to obtain a mixed material.

[0047] S2: Add distilled water to the mixed material, the addition of water accounts for 80% of the total slurry, mix and stir to obtain a uniform slurry, the stirring speed is at 3000 rpm, the stirring time is at 300min, and the viscosity of the mixed slurry is controlled at 20000mPa. s.

[0048] S3: Put the slurry into a p...

Embodiment 3

[0052] S1: Choose the carbon-based material of the waterproof and breathable membrane: 20μm dense granular graphite, 1μm carbon black, 10μm porous activated carbon, with a purity of more than 99%; choose the bonding aid in the waterproof and breathable membrane: polytetrafluoroethylene emulsion (PTFE), hydroxypropyl methylcellulose (HPMC) and polyvinyl alcohol (PVA); weigh the carbon-based material powder in proportion, graphite 50%, carbon black 30%, activated carbon 20%, in three-dimensional mixing Mix uniformly in the machine, and the mixing time is 90 minutes. Mix the mixed carbon-based solid-phase powder and the bonding agent in a ratio of 60% carbon-based solid-phase powder and 40% binder to obtain a mixed material.

[0053] S2: Add distilled water to the mixed material, the amount of water added accounts for 40% of the total slurry, mix and stir to obtain a uniform slurry, the stirring speed is at 2000 rpm, and the stirring time is at 200min to control the viscosity of t...

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Abstract

The invention relates to the new energy field of metal fuel batteries, in particular to a waterproof breathable film of a magnesium metal air battery and a continuous coating preparation method of the waterproof breathable film. The waterproof breathable film of the magnesium metal air battery comprises waterproof breathable film slurry and a carrier material, wherein the waterproof breathable film slurry is composed of, by mass, 20-50% of a waterproof breathable material and 50-80% of solvent water, and the waterproof breathable material is composed of, by mass, 30-90% of a carbon-based material and 10-30% of a binder The preparation method comprises the following steps: conducting stirring and pulping to obtain the waterproof breathable film slurry with specific viscosity, coating the carrier material with the waterproof breathable film slurry through a continuous coating method, and successively conducting drying, vacuum heat treatment and rolling to obtain the waterproof breathable film of the magnesium metal air battery. According to the invention, the air permeability, waterproofness and conductivity of the waterproof breathable film can be effectively regulated and controlled, the use requirement of the metal-air battery is met, a production process is simplified, production efficiency is improved, and the method is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the field of new energy sources of metal fuel cells, in particular to a waterproof and breathable membrane of a magnesium metal-air battery and a continuous coating preparation method thereof. Background technique [0002] Metal-air batteries have strong advantages such as no pollution, high energy, abundant raw materials, and reasonable prices, so they are called "green energy for the 21st century". Metal-air batteries use metal (zinc, magnesium, or aluminum, etc.) as the negative electrode active material, and the oxygen in the air continuously passes through the waterproof and breathable membrane of the positive electrode to reach the gas-solid-liquid three-phase interface and electrochemically reacts with the negative electrode metal to release For electric energy, the waterproof and breathable membrane is not only a channel for oxygen to enter the positive electrode to reach the gas-solid-liquid three-phase interface, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M12/06H01M12/08
Inventor 刘慧余琨余鹏宋觉敏
Owner CHANGSHA XUNYANG NEW MATERIAL TECH CO LTD
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