Characteristics of Aluminum-air Battery

• Main Authors: Wang, Chih-Min, 王智民
• Other Authors: Hsueh, Kan-Lin
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/16381406462223327932

碩士 === 國立聯合大學 === 化學工程學系碩士班 === 100 === Aluminum is abundant in the earth with the advantages of light weight, inexpensive, and high energy density as a fuel for metal-air battery. The anode of the aluminum-air battery is the aluminum metal, and the cathode is used the carbon material coated catalyst on its surface. The major voltage loss of the aluminum-air battery is due to the formation of aluminum oxide layer. In this study, different concentrations of acidic solution, neutral solution, and alkaline solution are used to study the effects of the electrode in these solutions. The corrosion potential, corrosion current, and the impedance of the electrode surface were measured by linear scanning voltammetry and electrochemical impedance analysis, respectively. A single cell performance was measured over different electrolyte. The experiment results show that in the neutral solution, the ohmic resistance and Tafel slope are significantly different to the other solutions. This is because of the aluminum oxide cannot be dissolved in neutral solution. Lower impedance of aluminum surface in concentrated acid or concentrated alkalis is observed as the consequence of oxide is dissolved in these solutions. The energy density of aluminum-air battery has the best performance in alkalis than those in acid or neutral solutions. As the alkaline concentration increased, the battery discharge current is significantly reduced and hydrogen bubble generation is enhanced.