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Magnesium metal air battery positive electrode catalyst and continuous coating preparation method thereof

An air battery, magnesium metal technology, applied in battery electrodes, fuel cell type half cells and secondary battery type half cells, fuel cell type half cells and primary cell type half cells, etc., can solve the discharge performance. Poor stability, poor catalyst distribution uniformity, catalyst distribution uniformity, large difference in thickness and structure consistency, 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

However, this spraying method has great differences in catalyst distribution uniformity and thickness structure consistency, resulting in unstable electrochemical performance of catalysts.
[0004] Although the above-mentioned preparation method can obtain a positive electrode catalyst and has certain catalytic performance, it can only be prepared in a single piece, the catalyst distribution uniformity is poor, and there are technical problems of poor discharge performance stability.

Method used

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  • Magnesium metal air battery positive electrode catalyst and continuous coating preparation method thereof
  • Magnesium metal air battery positive electrode catalyst and continuous coating preparation method thereof
  • Magnesium metal air battery positive electrode catalyst and continuous coating preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] S1: The conductive material in the selected catalyst is: dense spherical graphite with a powder particle size of 1 μm, porous activated carbon with a particle size of 100 μm, the purity is 99%, and the active material is: powdered manganese-based oxide (MnO2), particle size 1μm, the purity is 99%, the binder is: polytetrafluoroethylene emulsion (PTFE), the solvent is distilled water; the conductive material powder, active material powder, and binder are weighed in proportion, and the proportion is: conductive material spherical Graphite 35%, porous activated carbon 35%, active material MnO 2 20%, binder PTFE10%, the above materials are mixed evenly in a three-dimensional mixer, and the mixing time is 30min to obtain the mixed material.

[0047] S2: add solvent water to described mixed material in proportion, the addition of water accounts for 50% of catalytic slurry, after adding water, stir into uniform slurry in dispersion mixer, stirring speed is at 200 rev / min, stir...

Embodiment 2

[0053] S1: Select the conductive material in the catalyst to be: dense flake graphite with a powder particle size of 100 μm, carbon black with a particle size of 1 μm, the purity is above 99%, and the active material is: powdered manganese-based oxide (MnO2) with a particle size of 100 μm , the purity is 99%, the binder is: polyvinylidene fluoride (PVDF), the solvent is distilled water; the conductive material powder, active material powder, and binder are weighed in proportion, and the proportion is: conductive material flake graphite 10 %, carbon black 10%, active material (MnO 2 )75%, binder 5%, the above materials are mixed uniformly in the three-dimensional mixer, and the mixing time is 120min to obtain the mixed material

[0054] S2: Add solvent water in proportion to the mixed material, the addition of water accounts for 80% of the catalytic slurry, after adding water, stir into a uniform slurry in a dispersing mixer, the stirring speed is at 3000 rpm, The stirring tim...

Embodiment 3

[0059] S1: The conductive material in the catalyst is selected as follows: dense spherical graphite with a particle size of 10 μm, acetylene black with a particle size of 10 μm, activated carbon with a particle size of 80 μm, and a purity of 99.5%. The active material is: perovskite compound, 20 μm, a purity At 99%, the binder is: polytetrafluoroethylene emulsion (PTFE) and carboxymethyl cellulose (CMC), and the solvent is distilled water; the conductive material powder, the active material powder, and the binder are weighed in proportion and prepared The ratio is: spherical graphite 10%, acetylene black 10%, activated carbon 10%; perovskite compound 20%, binder 50%, mix the above materials evenly in a three-dimensional mixer, and the mixing time is 60min to obtain the mixed material

[0060] S2: Add solvent water in proportion to the mixed material, the amount of water added accounts for 60% of the catalytic slurry, after adding water, stir into a uniform slurry in a dispersin...

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Abstract

The invention relates to the technical field of development and application of new energy battery materials, and particularly relates to a magnesium metal air battery positive electrode catalyst and a continuous coating preparation method thereof. The positive electrode catalyst comprises a catalytic slurry and a current collector material, the catalytic slurry is composed of 20-50% by mass of a catalytic material and 50-80% by mass of solvent water, and the catalytic material is composed of the following raw materials in percentage by mass: 20-70% of a conductive material, 20-75% of an active substance and 5-50% of a binder. The catalytic slurry with specific viscosity is obtained by stirring and slurrying and then is coated to the current collector material by a continuous coating method, the catalytic activity and conductivity of the positive electrode catalyst obtained by drying, heat treatment curing and rolling are obviously improved, the formability and uniform dispersity of the slurry are ensured, the preparation process is simple, the production efficiency is improved, and the catalyst and the method are suitable for large-scale continuous production.

Description

technical field [0001] The invention relates to the technical field of development and application of new energy battery materials, in particular to a cathode catalyst material for a magnesium metal-air battery and a continuous coating preparation method thereof. Background technique [0002] The positive electrode catalyst of the magnesium metal-air battery is the key material to ensure the electrochemical reaction. The catalyst needs the joint action of oxygen and water participating in the electrochemical reaction to ensure the continuous progress of the battery discharge process. This requires the catalyst material itself to ensure the electrochemical reaction. Under the active performance, it has good air permeability and hydrophobicity. At the same time, the catalyst needs to be uniformly distributed on the current collector material and have an appropriate thickness. The function and structural characteristics of the catalyst must be consistent in order to have a good ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M12/06H01M12/08
CPCH01M12/08H01M12/06H01M4/86H01M4/88
Inventor 刘慧余琨余鹏宋觉敏
Owner CHANGSHA XUNYANG NEW MATERIAL TECH CO LTD
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