Negative electrode for metal air battery and preparation method thereof
A metal-air battery, cathode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low catalyst utilization efficiency, difficult to optimize electrode structure, large polarization, etc., achieve simple preparation method, improve electrode performance, reduce The effect of leakage
Inactive Publication Date: 2013-06-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
The traditional metal-air battery cathode preparation method is to press the multilayer composite structure by mechanical means (generally, carbon paper loaded with catalyst-nickel mesh-carbon paper loaded with catalyst-polytetrafluoroethylene microporous membrane is pressurized and composited. ), the electrode structure prepared by this method is difficult to optimize, the catalyst utilization efficiency is low, and the polarization is large, resulting in poor performance
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[0035] The metal-air battery electrode area is 32cm 2 , the anode is AZ-61 magnesium alloy; the electrolyte is 10% NaCl aqueous solution; the catalyst in the cathode catalytic layer is 40% MnO 2 / C, catalyst loading 5mg·cm -2 , the hydrophobic diffusion layer is carbon fiber felt impregnated with 60% PTFE, the thickness of carbon fiber felt is 3cm, PTFE accounts for 70% of the mass of the hydrophobic diffusion layer, the collector layer is foamed nickel, and the surface density of foamed nickel is 320g m -2 The hydrophobic diffusion layer loaded with the catalytic layer and the nickel foam were pressed together at 15MPa and 200°C for 2min to obtain the metal-air battery cathode.
[0036] The battery assembled above was discharged under constant current condition, the test condition was 30mA·cm -2 and 40mA·cm -2 . It can be seen from the test results that the performance of the battery is relatively good during the constant current discharge process with the above current d...
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Abstract
Provided is a negative electrode for a metal air battery and a preparation method thereof. The negative electrode for the metal air battery comprises a catalyst layer which is successively overlapped, a hydrophobic diffusion layer and an afflux layer; wherein the catalyst layer regards carbon loading manganese oxide as catalyst, and regards poly tetra fluoro ethylene (PTFE) as water repellent; the hydrophobic diffusion layer is a graphitized carbon fiber felt which is processed by PTFE emulsion in a hydrophobisation manner; and the afflux layer is made of nickel foam. The preparation method of the negative electrode for the metal air battery comprises the following steps: (1), preparing the hydrophobic diffusion layer; (2) preparing the catalyst layer; and (3), preparing the nickel foam and a negative electrode which is compressed based on the hydrophobic diffusion layer. Compared with the prior art, the negative electrode for the metal air battery for the metal / air battery has the advantages that a specific area of an air battery is large, leakage of electrolyte is small, electrode performance is optimum and the like. The preparation method of the negative electrode for the metal air battery has the advantages of being simple in process. Large scale quantity production is easy to start.
Description
technical field [0001] The invention relates to a metal / air battery air electrode structure, in particular to an air electrode structure and preparation process for metal / air batteries such as magnesium, aluminum and zinc. Background technique [0002] A metal / air battery is an electrochemical reaction device in which a metal (such as magnesium, aluminum, zinc, etc.) is used as the anode fuel, oxygen in the air is used as the oxidant, and lye or neutral brine is used as the electrolyte solution. my country's magnesium, aluminum, zinc and other metals are rich in reserves and low in price. Therefore, metal / air batteries have broad application prospects in many fields of mobile power sources such as electric vehicles, communication power supplies, field emergency power supplies, lighting power supplies, and reserve power supplies. The air electrode is one of the important components that affect the performance of metal / air batteries. The air electrode structure and preparatio...
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Login to View More IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 孙公权王二东舒朝著
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI