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Aluminum - air batteries use aluminum alloy anode and electrolyte additives

Author: LuLingBin
Tutor: TangYouGen
School: Central South University
Course: Applied Chemistry
Keywords: Aluminum - air battery Aluminum electrodes Al-In alloy Additive
CLC: TM911.41
Type: Master's thesis
Year: 2002
Downloads: 257
Quote: 2
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Abstract


Aluminum is the world's richest, the most widely used non-ferrous metals, electrochemical performance, is ideal for the development of chemical power and sacrificial anode electrode material. Aluminum - air battery is a great development prospects of high-energy battery, has the advantages of high-energy, non-toxic, inexpensive. This article briefly describes the course of development of aluminum - air batteries and aluminum sacrificial anodes and its problems, and summarizes the possible ways to improve the aluminum - air electrochemical performance. The molten produced Al-In, Al-In-Zn, Al-In-Bi, Al-In-Pb, Al-In-Zn-Bi, Al-In-Zn-Bi-Pb-series alloys such as research electrodes, their surface morphology was analyzed by testing their SEM and EDAX. -1 NaOH solution, In, Zn, Bi, Pb and other alloying addition to aluminum anode by anodic polarization curves, cyclic voltammetry curves, curves of hydrogen evolution electrode potential performance testing of 4mol L the impact is studied. The results showed that the activation of indium on the aluminum anode, so that the corrosion potential of the aluminum negative shift occurs, but will also increase the speed of the hydrogen evolution reaction; zinc added to promote the indium alloy, and reduce the formation of indium-rich segregation phase, but also can greatly reduce the rate of hydrogen evolution reaction of the aluminum anode, so that passivation; bismuth introduced help of the activation of the aluminum anode, but at the same time will lead to the improvement of the rate of hydrogen evolution; presence of lead to the aluminum anode passivation to effectively suppress the hydrogen evolution reaction, but increased the anodic polarization. After these several metal elements to form a multi-aluminum alloy, the complementary roles of the different elements of the aluminum electrode performance further improve. Experimental results show: several metal elements on the performance of the aluminum alloy anode through dissolution - redeposition play a role in the mechanism. Selected neutral electrolyte ZnCl 2 and SnCl 2 two additives in alkaline solution selected Ca 3 ( C 6 H 5 O 7 ) 2 ยท 4H 2 O CaSnO 3 the of Na 2 SnO 3 K the MnO of 2 4 three additives studied. Through a variety of electrochemical experiments testing various additives in neutral and alkaline electrolyte within the anode polarization curve of the Al-In electrode, the hydrogen evolution curve, the anode utilization, the electrode potential, since the corrosion potential and its effect a comprehensive analysis. The results show that the five kinds of additives introduced could improve the electrochemical properties of Al-In anode, the corrosion potential shifted negatively suppress the occurrence of the hydrogen evolution reaction, improving anode utilization. Especially K 2 MnO 4 role is particularly evident anode utilization reached 81.0%, the electrode potential up-1.78V. Their mechanism of action to follow \

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell > Metal - air battery
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