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Preparation method of hierarchical porous air electrode

An air electrode, hierarchical porous technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of high price, short cycle life, side reactions, etc., and achieve the effect of simple method, high cost efficiency and improved performance

Active Publication Date: 2016-01-06
SUZHOU UNIV
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Problems solved by technology

[0003] At present, due to the slow kinetics of oxygen reduction (ORR) and oxygen evolution reaction (OER) at the cathode, metal-air batteries have problems such as high charge-discharge overpotential, low cycle efficiency, poor rate performance, and short cycle life, which limit their wide application. practical application
Although commercial noble metal catalysts such as Pt / C have good catalytic performance, their scarcity, high price, and poor long-term cycle stability also restrict the further application of air batteries.
In addition, the existing air electrode preparation process needs to add carbon conductive agents and binders such as PVDF, etc., which are vulnerable to superoxide radicals during the battery cycle and cause side reactions, which further affect the metal-air battery. performance

Method used

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preparation example Construction

[0018] The preparation method of the hierarchical porous air electrode of the present invention comprises the following steps: (a) self-assembling a hard template on any surface of the current collector; (b) depositing and growing a metal oxide catalyst precursor on the hard template; ( c) Calcining the device obtained in step (b) to remove the hard template. The method is simple, efficient and low-cost, and the formed air electrode structure also has the following advantages: it can provide more catalytic active sites, and the open pore system provides freedom for reactant molecules to reach and leave the active sites of the catalyst. Restricted channels, discharge products are mainly deposited on the surface of the catalyst with a porous structure, etc., thereby improving the performance of the air electrode.

[0019] In the step (a), the surface of the current collector is treated (acid washing can be used, such as nitric acid solution with a mass concentration of 68%, for ...

Embodiment 1

[0024] This embodiment provides a method for preparing a hierarchical porous air electrode, such as figure 1 As shown, it includes the following steps:

[0025] (a) Select carbon paper as the current collector, ultrasonically clean it successively in acetone, isopropanol, ethanol and water, dry it in an oven for later use; place the carbon paper in a nitric acid solution with a mass concentration of 68% for 30 minutes, Its surface is negatively charged. After taking it out, clean it with deionized water and ethanol, and dry it in an oven; 2 In the ethanol dispersion of spherical hard template (the concentration of spherical hard template is 25mg / ml) for 2-5 minutes, make SiO 2 The balls are self-assembled on the surface of the current collector, then dried and dried, and repeated 3 to 5 times to ensure the formation of multiple hard template layers on the surface of the current collector to obtain a fluid / hard template substrate.

[0026] (b) Immerse the fluid / hard template ...

Embodiment 2

[0030] This example provides a method for preparing a hierarchical porous air electrode. The general steps are the same as those in Example 1, except that the hard template used is polystyrene balls; in the end, it does not need to be soaked in NaOH, but directly calcined That's it.

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Abstract

The invention relates to a preparation method of a hierarchical porous air electrode. The method is characterized by comprising the following steps: (a) self-assembling a hard template on any surface of a current collector; (b) depositing and growing a metal oxide catalyst on the hard template; and (c) carrying out burning on a device obtained in the step (b) to remove the hard template. According to the preparation method of the hierarchical porous air electrode, firstly, the hard template is self-assembled on the surface of the current collector; secondly, a deposition is carried out to form the metal oxide catalyst with a corresponding structure employing the hard template as a template; and finally the hard template is removed by burning. The method is simple, efficient and low in cost; the formed air electrode structure also has a plurality of advantages that relative multiple catalytic active sites and an opening system can be provided to provide a free unlimited channel for reactant molecules for reaching or departing from catalyst active sites; and discharge products are mainly deposited on a porous structure catalyst surface and the like, so that the properties of the air electrode are improved.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a method for preparing an electrode, in particular to a method for preparing a hierarchical porous air electrode. Background technique [0002] The metal-air battery uses the air electrode loaded with catalyst as the cathode and the metal as the anode. It has the characteristics of high capacity and environmental friendliness. Its theoretical energy density is as high as 11680Wh / kg, which is much higher than that of traditional lithium-ion batteries. Comparable to the energy density of gasoline (13000Wh / kg). Such a high energy density can be used as a new power source to replace gasoline, to develop projects such as hybrid electric vehicles, or even pure electric vehicles, so as to solve the problems of energy shortage and environmental pollution caused by transportation. great interest and attention. [0003] At present, due to the slow kinetics of oxygen reduction (ORR) and o...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCH01M4/8807H01M4/8853H01M4/8885Y02E60/50
Inventor 田景华王金杨瑞枝
Owner SUZHOU UNIV
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