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Air electrode and manufacturing method thereof

A technology of air electrode and manufacturing method, which is applied in the direction of fuel cell half-cells and primary battery-type half-cells, etc., and can solve the problems of unstable gas-liquid-solid three-phase interface, reduced reaction site, and large internal resistance of air electrodes, etc. problems, achieve the effect of maintaining the balance of the gas-liquid-solid three-phase interface, stabilizing the reaction site, and high performance

Inactive Publication Date: 2018-05-18
莱尔(深圳)新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a simple structure will lead to large internal resistance of the air electrode, the oxygen transmission rate and adsorption rate cannot be guaranteed, and the electrode cannot perform as it should.
More importantly, the gas-liquid-solid three-phase interface in the air electrode is unstable, and the balance is easily broken. The liquid gradually penetrates and submerges the solid phase area, and the reaction site is greatly reduced. Eventually, the liquid penetrates the entire electrode and the electrode is scrapped.
A series of problems caused by this make the metal-air battery unable to work stably for a long time, and the fuel replacement mode cannot be truly realized.

Method used

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  • Air electrode and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Mix 30g of activated carbon, 30g of manganese dioxide, and 30g of graphite with 10g of polytetrafluoroethylene emulsion (solid content: 30%) and roll to make catalytic layer 1 for later use;

[0041] (2) Select 30g of activated carbon, 20g of manganese dioxide, and 30g of graphite to mix with 20g of polytetrafluoroethylene emulsion (solid content: 30%) and roll to form the reflection layer 2 for later use;

[0042] (3) Mix 10g of activated carbon with 40g of carbon black, then add 50g of polyvinylidene fluoride emulsion (solid content: 60%), mix and roll to form a hydrophobic layer 3 for later use;

[0043] (4) Select 70g of carbon black and 30g of polyvinylidene fluoride emulsion (solid content: 60%) to mix and roll to form a breathable protective layer 5 for later use;

[0044] (5) The catalytic layer 1, the reaction layer 2, and the hydrophobic layer 3 are sequentially arranged on the upper side of the current collector 4, and the breathable protective layer 5 is...

Embodiment 2

[0046] (1) Select 50g of activated carbon, 30g of carbon-supported platinum and 10g of graphite and mix them with 10g of polyvinylidene fluoride emulsion (solid content: 40%) to mix and roll to form catalytic layer 1 for later use;

[0047] (2) Mix 50g of activated carbon, 30g of carbon-supported platinum, and 20g of graphite, and then mix with 10g of polyvinylidene fluoride emulsion (solid content: 50%) to form a reflection layer 2 for later use;

[0048] (3) Select 10g of activated carbon and 40g of carbon black to mix, then add 50g of polytetrafluoroethylene emulsion (solid content: 60%) and mix and roll to form a hydrophobic layer 3 for later use;

[0049] (4) Select 70g of carbon black and 30g of polytetrafluoroethylene emulsion (solid content is 40%) mixed and rolled to make breathable protective layer 5 for later use;

[0050] (5) The catalytic layer 1, the reaction layer 2, and the hydrophobic layer 3 are sequentially arranged on the upper side of the current collector...

Embodiment 3

[0052] (1) Mix 20g of activated carbon, 35g of platinum on carbon, and 25g of graphite with 20g of polytetrafluoroethylene emulsion (solid content: 30%) and roll to make catalytic layer 1 for later use;

[0053] (2) Select 40g of activated carbon, 20g of carbon-supported platinum, and 20g of graphite to mix and then mix with 20g of polytetrafluoroethylene emulsion (solid content: 30%) and roll to form the reflection layer 2 for later use;

[0054](3) Select 20g of activated carbon and 50g of carbon black to mix, then add 30g of polytetrafluoroethylene emulsion (solid content is 40%), mix and roll to form a hydrophobic layer 3 for later use;

[0055] (4) Select 75g of carbon black and 25g of polytetrafluoroethylene emulsion (solid content is 35%) mixed and rolled to make breathable protective layer 5 for later use;

[0056] (5) The catalytic layer 1, the reaction layer 2, and the hydrophobic layer 3 are sequentially arranged on the upper side of the current collector 4, and the...

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Abstract

The invention relates to an air electrode and a manufacturing method thereof. The air electrode comprises a current collector; a ventilating protection layer is arranged at the lower end of the current collector; and a hydrophobic layer, a reaction layer and a catalysis layer are arranged at the upper end of the current collector from the bottom up in sequence. According to the air electrode disclosed in the invention, the formed A surface is high in hydrophily and weak in hydrophobicity, and a liquid can permeate into the air electrode through the hole channels in the medium to form B surfacepermeation in a fingering manner; along with prolonging of the permeation distance, the medium hydrophobicity is gradually improved, and the holes are smaller and smaller; as a result, the permeationflow resistance is improved, and liquid permeation speed is lower and lower, and finally, the liquid stops permeation in a certain position in the middle of the A and B surfaces to form a stable air,liquid and solid three-phase interface; and by virtue of the interface, a large number of occasions can be provided for the positive electrode reaction, submerging of the electrode by the liquid canbe prevented, and finally, the air electrode can satisfy the standards of high performance and long service life.

Description

technical field [0001] The invention relates to an air electrode, in particular to an air electrode and a manufacturing method thereof. Background technique [0002] The air electrode is the positive electrode of the metal-air battery, providing a reaction site for oxygen while maintaining a gas-liquid-solid three-phase interface. The existing air electrode structure is relatively simple, and usually only has a single-layer structure, which is just to combine a layer of membrane and a current-collecting net, or to press a mixed material and a current-collecting net together. Such a simple structure will lead to large internal resistance of the air electrode, the oxygen transmission rate and adsorption rate cannot be guaranteed, and the electrode cannot perform as it should. More importantly, the gas-liquid-solid three-phase interface in the air electrode is unstable, and the balance is easily broken. The liquid gradually penetrates and submerges the solid phase area, and th...

Claims

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Application Information

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IPC IPC(8): H01M12/06
CPCH01M12/06
Inventor 王乾
Owner 莱尔(深圳)新能源有限公司
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