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Positive electrode material of magnesium metal air battery and continuous coating preparation method thereof

A positive electrode material and air battery technology, applied in the direction of battery electrodes, fuel cell half cells and primary battery half cells, fuel cell half cells and secondary battery half cells, etc., can solve the problem of metal air Poor performance uniformity of battery cathode materials, unstable discharge performance, unsuitable for mass production, etc.

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

The process of producing air battery electrodes by these methods is complicated, and the most important thing is the sheet method of production, which cannot realize continuous large-scale production, which seriously restricts the industrialization process of metal-air battery positive electrodes.
[0004] It can be seen that using the existing preparation methods to obtain metal-air battery cathode materials has poor performance uniformity, unstable discharge performance, and is not suitable for mass production, which limits the application of magnesium metal-air batteries.

Method used

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  • Positive electrode material of magnesium metal air battery and continuous coating preparation method thereof
  • Positive electrode material of magnesium metal air battery and continuous coating preparation method thereof
  • Positive electrode material of magnesium metal air battery and continuous coating preparation method thereof

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Effect test

Embodiment 1

[0043] Select conductive material as graphite and activated carbon, graphite is flake, average particle size is 1 μm, activated carbon is porous structure, average particle size is 1 μm, purity is above 99%, catalyst is manganese dioxide (α-MnO2 type), particle size α-MnO2 is granular, with a purity of over 99%, the binder is polytetrafluoroethylene emulsion (PTFE) and styrene-butadiene rubber emulsion (SBR), and the conductive material and catalyst are mixed evenly in a three-dimensional mixer , the mixing time is 30min, and the proportioning of catalytic materials is: graphite and activated carbon 20%, manganese dioxide 75%, polytetrafluoroethylene emulsion (PTFE) and styrene-butadiene rubber emulsion (SBR) 5%, add the catalyst layer slurry A total of 40% distilled water is mixed and stirred into a uniform slurry in a pulper, the stirring speed is 200 rpm, the stirring time is 30min, and the viscosity of the slurry is controlled at 5000mPa·s; then transferred to a planetary m...

Embodiment 2

[0051] Select conductive materials as graphite and activated carbon, graphite is granular, activated carbon is porous structure, average particle size is 100 μm, purity is above 99%, catalyst is manganese dioxide (α-MnO2 type), particle size is 100 μm, α-MnO2 It is granular, with a purity of more than 99%. The binder is polytetrafluoroethylene emulsion (PTFE), styrene-butadiene rubber emulsion (SBR) and hydroxypropyl methylcellulose (HPMC). Mix evenly in the mixer, the mixing time is 120min, the catalyst material ratio graphite and activated carbon 70%, manganese dioxide 20%, polytetrafluoroethylene emulsion (PTFE), styrene-butadiene rubber emulsion (SBR) and hydroxypropyl methyl Base cellulose (HPMC) binder 10%, add distilled water accounting for 80% of the total amount of the slurry of the catalytic layer, mix and stir into a uniform slurry in a pulper, the stirring speed is at 3000 rpm, and the stirring time is 300min , the viscosity of the slurry is controlled at 20000mPa ...

Embodiment 3

[0058] The conductive material is 45 μm granular graphite, 10 μm activated carbon, and 10 μm acetylene black, with a purity of more than 99%. The catalyst is manganese dioxide (δ-MnO2 type) with a particle size of 10 μm and a purity of 99%. For polytetrafluoroethylene emulsion (PTFE), acrylonitrile multi-polymer dispersion (LA133), polyvinyl alcohol (PVA), the conductive material and catalyst were mixed uniformly in a three-dimensional mixer, and the mixing time was 60 minutes. The ratio is: graphite, activated carbon and acetylene black 30%; catalytic material δ-MnO 250%; binder polytetrafluoroethylene emulsion (PTFE), acrylonitrile multi-polymer dispersion (LA133), polyvinyl alcohol (PVA) 20%, then add distilled water accounting for 50% of the total amount of the slurry in the catalytic layer, mix and stir into a uniform slurry in a pulper, the stirring speed is at 1000 rpm, the stirring time is 120min, and the viscosity of the slurry is controlled at 10000mPa s; then transf...

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Abstract

The invention relates to metal fuel cell materials in the fields of new energy and new materials and to the technical field of processing, in particular to a positive electrode material of a magnesium metal air battery and a continuous coating preparation method thereof. The positive electrode material comprises a current collector, a catalytic layer, a waterproof breathable layer and a sizing material layer, wherein the catalytic layer and the waterproof breathable layer respectively coat two sides of the current collector, and the sizing material layer coats the waterproof breathable layer. The positive electrode material can improve the waterproof effect of the waterproof breathable layer, slow down the permeation of water in the battery electrolyte, ensure that enough gas enters the catalyst layer to participate in the reaction, and effectively prolong positive electrode discharge time.

Description

technical field [0001] The invention relates to the field of metal fuel cell materials and processing technology in the field of new energy and new materials, in particular to a magnesium metal-air battery cathode material and a continuous coating preparation method thereof. Background technique [0002] Magnesium and magnesium alloys are very active metal materials. They are abundant in reserves, low in price, and the electrochemical reaction products will not pollute the environment. They are ideal negative electrode materials for metal-air batteries. The positive electrode materials for metal-air batteries are generally composed of catalysts for electrochemical reactions Composed of conductive agent and air permeable membrane, the catalytic properties of the positive electrode material and the active metal of the negative electrode are used together to ensure the stability of the battery's electrical properties such as voltage, current, and power. [0003] At present, the...

Claims

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Application Information

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