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Cathode material of metal-air battery, preparation method of cathode material and metal-air battery

A metal-air battery and cathode material technology, which is applied in battery electrodes, fuel cell-type half-cells and primary cell-type half-cells, circuits, etc. performance, improved power density and stability of use, and the effect of efficient current collection

Active Publication Date: 2015-12-16
宁波烯铝新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Because the existing air battery cathode components are difficult to efficiently transmit oxygen and collect current at the same time, the air battery assembled from the existing air battery cathode components has low power density and poor stability in use

Method used

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preparation example Construction

[0070] The present invention provides a method for preparing a metal-air battery cathode material described in the above technical solution, comprising the following steps:

[0071] a), the bottom layer and the core layer are pressed together, and the catalyst slurry is used to form a film on the surface of the core layer before or after the pressing, so as to obtain the metal-air battery cathode material;

[0072] The bottom layer comprises metal foam and a hydrophobic material;

[0073] The core layer includes metal foam and a hydrophobic material;

[0074] The core layer has a greater porosity and / or pore size than the bottom layer;

[0075] The catalyst slurry includes a porous carbon material, a hydrophobic material, a catalyst and a solvent.

[0076] In the preparation method of the metal-air battery cathode material provided by the present invention, the bottom layer and the core layer are pressed together, and the catalyst slurry is used to form a film on the surface...

Embodiment 1

[0112] 1) Preparation of bottom layer:

[0113] Select foamed nickel with a thickness of 1.5 mm, a pore size of 300 μm, a porosity of 70%, and a mass of 0.46 g, and impregnate it in 20 wt % polytetrafluoroethylene emulsion (Shanghai 3F Company). The metal foam impregnated with polytetrafluoroethylene was taken out, dried at 80°C for 5 hours, and then sintered at 350°C for 1 hour to obtain the bottom layer.

[0114] SEM observations were carried out on the non-impregnated nickel foam and the prepared core layer respectively, the results are as follows figure 1 with figure 2 shown. figure 1 The scanning electron micrograph of the nickel foam provided by the embodiment of the present invention 1; figure 2 The scanning electron microscope image of the bottom layer provided by Example 1 of the present invention. pass figure 1 and figure 2 It can be seen from the comparison that the polytetrafluoroethylene in the bottom layer provided by this embodiment has been compounded ...

Embodiment 2

[0126] 1) Preparation of bottom layer:

[0127] Select foamed nickel with a thickness of 1.5 mm, a pore size of 300 μm, a porosity of 70%, and a mass of 0.46 g, and impregnate it in 40 wt % polytetrafluoroethylene emulsion (Shanghai 3F Company). The metal foam impregnated with polytetrafluoroethylene was taken out, dried at 80°C for 5 hours, and then sintered at 350°C for 1 hour to obtain the bottom layer.

[0128] The porosity and pore diameter of the bottom layer prepared above were measured, and the results showed that the porosity was 30% and the pore diameter was 120 μm.

[0129] 2) Preparation of the core layer:

[0130] Select 0.35g nickel foam with a thickness of 1.5mm, an average pore diameter of 500μm, and a porosity of 97%, and impregnate it in 20wt% polytetrafluoroethylene emulsion (Shanghai 3F Company). The metal foam impregnated with polytetrafluoroethylene was taken out, dried at 80° C. for 5 hours, and then sintered at 350° C. for 1 hour to obtain the core la...

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Abstract

The application belongs to the field of a battery, in particular relates to a cathode material of a metal-air battery, a preparation method of the cathode material and the metal-air battery. The metal-air battery provided by the application comprises a bottom layer, a core layer and a catalytic layer which are in sequential contact, wherein the bottom layer comprises metal foam and polytetrafluoroethylene; the core layer comprises metal foam and polytetrafluoroethylene; the catalytic layer comprises a porous carbon material, polytetrafluoroethylene and a catalyst; and the porosity and / or the aperture of the core layer is greater than that of the bottom layer. According to the application, the porosities and / or the apertures of the core layer and the bottom layer are designed gradiently, thus, the cathode material provided by the invention is ensured to high-efficiently delivery oxygen and also high-efficiently collect current, the power density, the application stability and the like of the metal-air battery assembled from the cathode material are obviously improved.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a metal-air battery cathode material, a preparation method thereof, and a metal-air battery. Background technique [0002] Energy is an important material basis for developing the national economy and improving people's living standards, and it is also an important factor that directly affects economic development. Since entering the 21st century, human beings are faced with the major challenge of achieving sustainable economic and social development. How to maintain high-speed economic development under the dual constraints of limited resources and strict environmental protection requirements has become a global hot issue. However, problems such as resource shortage, environmental pollution, and greenhouse effect brought about by traditional energy utilization methods will become more prominent. Therefore, traditional energy structures and their utilization methods are incre...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M12/06H01M4/86
CPCH01M4/8605H01M4/8875H01M12/06
Inventor 苗鹤刘兆平薛业建王勤孙珊珊李世华
Owner 宁波烯铝新能源有限公司
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