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Consolidation preparation method of waterproof breathable layer material used for magnesium metal air battery

A technology of waterproof breathable layer and air battery, applied in battery electrodes, fuel cell half-cells and primary battery-type half-cells, fuel cell-type half-cells and secondary battery-type half-cells, etc., can solve waterproof The air-permeable layer has a small air permeability, blocks the oxygen diffusion channel, and the process is complex, etc., to achieve the effect of improving the air permeability, reducing production costs, and simplifying the preparation process.

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

[0005] The invention provides a method for preparing a waterproof and air-permeable layer material for a magnesium metal-air battery. Leakage, the problem of blocking oxygen diffusion channels

Method used

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  • Consolidation preparation method of waterproof breathable layer material used for magnesium metal air battery
  • Consolidation preparation method of waterproof breathable layer material used for magnesium metal air battery
  • Consolidation preparation method of waterproof breathable layer material used for magnesium metal air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1: Select conductive material and binder colloid material, wherein the conductive material is layered graphite and activated carbon, the ratio of the two is 3:2, and the combined composition is 70%; the binder colloid is PTFE (polyethylene Tetrafluoroethylene), accounting for 30% of the components;

[0034] S2: Sieve layered graphite and activated carbon through a 300-mesh sieve to remove large particle powder, add it to water, and stir for 60 minutes at a stirring speed of 1000 rpm;

[0035] S3: Add the binder colloid, stir while adding, the stirring speed is 1000 rpm, after adding, stir for another 6 hours;

[0036] S4: Scrape the mixture of the stirred conductive material and the adhesive colloid on the surface of the nickel foam, control the thickness to 0.5mm, and dry it in an air atmosphere at 100°C for 2 hours to obtain a composite material;

[0037] S5: Place the composite material at the head of a heat press that can be heated and pressurized, and heat and pr...

Embodiment 2

[0040] S1: Select conductive materials and binder colloid materials, wherein the conductive materials are spherical graphite, activated carbon and acetylene black, the ratio is 5:4:1, and the three components together account for 20%; the binder colloid is PTFE (polytetrafluoroethylene) and SBR emulsion (styrene-butadiene rubber), the ratio is 8:2, accounting for 80% of the components;

[0041] S2: Spherical graphite, activated carbon and acetylene black are sieved through a 300-mesh sieve to remove large particle powder, and then added to water, stirred for 10 minutes, and the stirring speed is 120 rpm;

[0042] S3: Add the binder colloid, stir while adding, the stirring speed is 120 rpm, and stir for 1 hour after adding;

[0043] S4: Scrape the stirred conductive material and adhesive colloid mixture on the surface of the copper mesh, the thickness is controlled at 0.1mm, and dry at 60°C for 0.5h in an air atmosphere to obtain a composite material;

[0044] S5: Place the co...

Embodiment 3

[0047]S1: Select conductive materials and binder colloidal materials, among which the conductive materials are layered graphite, activated carbon, carbon black and carbon nanotubes, the ratio is 2:5:2:1, and the four together account for 50% of the composition ; The binder colloid is PVDF (polyvinylidene fluoride), CMC (carboxymethyl cellulose) and PAA (polyacrylic acid), the ratio is 8:1:1, and the combined components are 50%;

[0048] S2: Sieve layered graphite, activated carbon, carbon black and carbon nanotubes through a 300-mesh sieve to remove large particle powder, add it to water, stir for 30 minutes, and the stirring speed is 500 rpm;

[0049] S3: Add the binder colloid, stir while adding, the stirring speed is 500 rpm, after adding, stir for another 3 hours;

[0050] S4: Scrape the mixture of the stirred conductive material and the adhesive colloid on the surface of the copper mesh, the thickness is controlled at 2mm, and dry at 80°C for 1 hour in an air atmosphere t...

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Abstract

The invention provides a consolidation preparation method of a waterproof breathable layer material used for a magnesium metal air battery. The consolidation preparation method comprises the following steps: selecting a conductive material and a binder colloid material; conducting sieving, adding the sieved conductive material into a solvent, and carrying out stirring; adding the selected binder colloid material while stirring; coating the surface of a current collector skeleton of an electrode with the stirred mixture of the conductive material and the binder colloid material, and conducting drying to obtain a composite material; and simultaneously heating and pressurizing the composite material for curing, releasing the pressure, and conducting cooling at normal temperature to obtain the waterproof breathable layer material. According to the preparation method, the process of bonding between a waterproof breathable layer and a current collector is simplified, the hydrophobic and breathable effects of the waterproof breathable layer are improved, the preparation process of a waterproof breathable electrode of the air battery is simplified, the preparation method is suitable for large-scale batch production, and production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of development and application of new energy battery materials, in particular to a method for preparing a waterproof and air-permeable layer material for a magnesium metal-air battery. Background technique [0002] A metal-air battery uses an active metal material as the negative electrode and a catalyst as the positive electrode. The electrochemical reaction between the two is used to convert chemical energy into electrical energy. The positive electrode of the air battery is generally composed of a catalyst and a waterproof and breathable layer. The catalyst The active material in the catalyst reacts with the metal negative electrode to release electric energy, while the oxygen in the air reaches the gas-solid-liquid three-phase interface in the catalyst through the waterproof and breathable layer to maintain the continuous progress of the electrochemical reaction. If the diffusion channel of oxygen in the...

Claims

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Application Information

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