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Gas diffusion layer, preparation method and metal-air battery

A technology of gas diffusion layer and hydrophobic layer, which is applied to battery electrodes, fuel cell half-cells, primary battery half-cells, circuits, etc. It can solve problems such as poor conductivity, large cathode resistance, and affecting battery performance. The effect of high electrical conductivity and high flexural strength

Active Publication Date: 2015-11-25
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, both of the above two structures use carbon materials as conductive support materials, and the conductivity of carbon materials is poor, and the conductivity is generally less than 2S / cm, which leads to the use of carbon materials. Performance in the case of high current discharge; in addition, the strength of the gas diffusion layer with carbon materials as the skeleton is limited, and bending deformation often occurs when preparing large-area air cathodes

Method used

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  • Gas diffusion layer, preparation method and metal-air battery
  • Gas diffusion layer, preparation method and metal-air battery
  • Gas diffusion layer, preparation method and metal-air battery

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preparation example Construction

[0060] The present invention also provides a method for preparing a gas diffusion layer, comprising the following steps:

[0061] Coating the hydrophobic material on the surface of the porous support material and the inner wall of the channel according to a certain proportion, drying and roasting to obtain the gas diffusion layer, the porous support material is one or more of metal-based ceramics, conductive ceramics and other ceramics, It can also be a composite support body of ceramics and carbon felt or graphite felt.

[0062] In the present invention, the electronically conductive porous support material is prepared according to the following method:

[0063] A1) Sintering the perovskite-type conductive ceramic green body to obtain a conductive porous support body;

[0064] or

[0065] A2) After sintering the formed composite material powder, undergo a reduction reaction to obtain a conductive porous support body, and the composite material powder is a mixture of metal o...

Embodiment 1

[0112] Example 1 Porous La 0.75 Sr 0.25 MnO 3 Metal Air Batteries with Gas Diffusion Layer Fabricated on Conductive Ceramic Porous Supports

[0113] Take 200 grams of La 0.75 Sr 0.25 MnO 3 The powder is used as a raw material, and the powder is kept under pressure at 20 MPa at room temperature for 5 minutes to obtain a green body sample pressed to a certain thickness, and the sample is fired at 1100° C. for 4 hours to obtain a conductive porous support with a thickness of 1 mm.

[0114] The prepared conductive porous support was detected by scanning electron microscope, the results are shown in figure 1 . Depend on figure 1 It is the scanning electron micrograph of the conductive porous support prepared in Example 1. Depend on figure 1 It can be seen that the conductive support prepared in Example 1 has a porous structure.

[0115] The electrical conductivity of the above-mentioned conductive porous support was 10 S / cm by four-electrode test, the porosity was 33% by ...

Embodiment 2

[0121] Example 2 Porous Ni-3YSZ metal-ceramic porous support prepares a metal-air battery with a gas diffusion layer

[0122] Using 10 grams of NiO and 3YSZ powders with a mass ratio of 1:1 as raw materials, the powders were configured into a cast slurry, and cast into a green body sample of a certain thickness, and the sample was fired at 1300 ° C for 4 hours to obtain a thickness of 0.4 mm composite ceramic support body, the porous Ni-3YSZ metal-ceramic conductive support body was obtained by reducing the support body at 500 °C for 10 hours in a pure hydrogen atmosphere.

[0123] The prepared metal-ceramic conductive support body is subjected to electron scanning microscope detection, and the results are shown in image 3 . Depend on image 3 The scanning electron microscope image of the metal-ceramic conductive support prepared in Example 2. Depend on image 3 It can be seen that it exhibits uniform porosity.

[0124] The electrical conductivity of the metal-ceramic co...

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Abstract

The invention provides a gas diffusion layer, which comprises a conductive porous support body and a hydrophobic layer, wherein the hydrophobic layer coats the surface of the conductive porous support body and a pore inner wall of the conductive porous support body; and the material of the conductive porous support body is selected from conductive ceramic. With the conductive ceramic as the material of the conductive porous support body of the gas diffusion layer, the gas diffusion layer has relatively high electrical conductivity and relatively high bending strength; and the gas diffusion layer obtained from the material of the conductive porous support body can be used for preparing a high-performance metal-air battery.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a gas diffusion layer, a preparation method thereof and a metal-air battery. Background technique [0002] Metal-air batteries are generally composed of a metal anode, an electrolyte, and an air cathode. The performance of the cathode is the core of the battery performance, and the structure of the air cathode is generally a three-layer structure. From the inside to the outside: the catalyst layer in direct contact with the electrolyte , the gas diffusion layer that provides the reactant oxygen for the catalyst layer, and the third layer is the current-collecting conductive layer; the gas diffusion layer is the key to the cathode, which prevents the electrolyte from flooding the reactant gas transport channel, and even the electrolyte The risk of leakage of the battery, while also taking into account the function of effective diffusion of gas to the catalyst layer,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M12/06
CPCH01M4/8605H01M4/8807H01M12/06
Inventor 薛业建刘兆平苗鹤孙珊珊王勤李世华
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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