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최현아 ( Hyun A Choi ),고보경 ( Bo Kyung Ko ),심상은 ( Sang Eun Shim ),백성현 ( Sung Hyeon Baeck ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.4
Three different carbon blacks (Vulcan, Ketjen Black, and 1:1 mixture of the two) are used as cathode catalysts for a lithium/air secondary battery, and their electrochemical properties are investigated. The surface morphology change after discharge is examined using scanning electron microscopy (SEM), and the discharge products are analyzed using Fourier transform-infrared spectroscopy (FT-IR). In order to measure the electrochemical properties, the charge and discharge measurements are conducted at a constant current density of 0.2 mA/cm2, which monitors the voltage change. Electrochemical impedance spectroscopy (EIS) analyses are also performed in order to examine the change in the charge transfer resistance during the charge-discharge process. Compared with both the Ketjen black and Vulcan, the 1:1 mixture of the two carbon blacks exhibits the best performance as a cathode for the Li/air secondary battery, which results from a synergistic effect that exploits-both carbon blacks.