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Kim, Youngsik
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Research Interests
  • Ionic conducting ceramic electrolyte membranes, energy conversion and storage materials and devices

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Effects of aqueous electrolytes on the voltage behaviors of rechargeable Li-air batteries

Cited 22 times inthomson ciCited 16 times inthomson ci
Title
Effects of aqueous electrolytes on the voltage behaviors of rechargeable Li-air batteries
Author
He, HuiNiu, WeiAsl, Nina MahootcheianSalim, JasonChen, RongrongKim, Youngsik
Keywords
Air electrode; Alkaline aqueous electrolyte; Aqueous Li-air battery; Discharge-charge voltage efficiency
Issue Date
2012-04
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.67, no., pp.87 - 94
Abstract
Aqueous Li-air batteries have attracted a great deal of attention due to their high theoretical energy capacities. However, while still in the early stages of research, the reported energy capacities of Li-air batteries are far from what has been theoretically predicted. In this research, we have designed a Li-air battery that has a Li organic liquid electrolyte Li +- conducting glass ceramic plate (LiGC plate) aqueous electrolyte Pt air electrode structure and studied the impacts of the compositions of the aqueous electrolyte on the battery performance. With lower concentrations of alkali aqueous electrolytes (≤0.05 M LiOH), a discharge voltage of approximately 3.5 V (at 0.05 mA cm -2) and a voltage efficiency up to 84% were observed. The addition of LiClO 4 into the aqueous solution slightly lowered the discharge voltage to 3.3 V but dramatically decreased the internal resistance of the battery to 35.4 Ω cm -2. With a charge voltage plateau observed at 3.90 V at a current of 0.05 mA cm -2, the Li organic liquid electrolyte LiGC 1 M LiClO 4 Pt air battery showed an 85% voltage efficiency at room temperature. Adding LiClO 4 into the aqueous electrolytes resulted in an impedance reduction and slowed the pH increase of the alkaline-based electrolyte due to the fast or long-term discharge of the air electrode in the Li-air battery. The discharge and charge voltage behaviors of the battery and the changes to the pH values of the aqueous electrolyte at different current rates were also recorded and are presented in this paper.
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DOI
10.1016/j.electacta.2012.02.001
ISSN
0013-4686
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ECHE_Journal Papers
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