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Synthesis and Characterizations of Mn1+XCo2-XO4 Solid Solution Catalysts for Highly Efficient Li/Air Secondary Battery

고효율의 리튬/공기 이차전지 공기전극용 Mn1+XCo2-XO4 고용체 촉매 합성 및 분석

Park, Inyeong;Jang, Jaeyong;Lim, Dongwook;Kim, Taewoo;Shim, Sang Eun;Park, Seok Hoon;Baeck, Sung-Hyeon
박인영;장재용;임동욱;김태우;심상은;박석훈;백성현

  • Received : 2015.06.20
  • Accepted : 2015.08.28
  • Published : 2015.11.30

Abstract

$Mn_{1+X}Co_{2-X}O_4$ solid solutions with various Mn/Co ratios were synthesized by a combustion method, and used as cathode catalysts for lithium/air secondary battery. Their electrochemical and physicochemical properties were investigated. The morphology was examined by transmission electron microscopy (TEM), and the crystallinity was confirmed by X-ray diffraction (XRD) analyses. For the measurement of electrochemical properties, charge and discharge measurements were carried out at a constant current density of $0.2mA/cm^2$, monitoring the voltage change. Electrochemical impedance spectroscopy (EIS) analyses were also employed to examine the change in charge transfer resistance during charge-discharge process. $Mn_{1+X}Co_{2-X}O_4$ solid solutions showed enhanced cycleability as a cathode of Li/air secondary battery, and the performance was found to be strongly dependent on Mn/Co ratio. Among synthesized catalysts, $Mn_{1.5}Co_{1.5}O_4$ exhibited the best performance and cycleability, due to high charge transfer rate.

Keywords

Li/Air battery;$Mn_{1+X}Co_{2-X}O_4$ solid solution;Air Electrode

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Acknowledgement

Supported by : 한국연구재단