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15.07.2011




Ceramics International
Volume 37, Issue 7, September 2011, Pages 2215-2220





Electrochemical properties of LiCoyMn2−yO4 synthesized using a combustion method in a voltage range of 3.5–5.0 V


Myoung Youp Songa, Corresponding Author Contact Information, E-mail The Corresponding Author, Ik Hyun Kwonb, Hye Ryoung Parkc and Daniel R. Mummd





a Division of Advanced Materials Engineering, Department of Hydrogen and Fuel Cells, Hydrogen & Fuel Cell Research Center, Engineering Research Institute, Chonbuk National University, 664-14 1ga Deogjindong Deogjingu, Jeonju 561-756, Republic of Korea


b Jeonbuk Technopark Regional Industry Evaluation Agency 723-1, 2ga Palbok-Dong, Dukjin-gu, Jeonju, Jeonbuk 561-844, Republic of Korea


c School of Applied Chemical Engineering, Chonnam National University, 300 Yongbongdong Bukgu, Gwangju 500-757, Republic of Korea


d Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92697-2575, USA




Received 20 October 2010;


revised 31 January 2011;


accepted 7 March 2011.


Available online 14 April 2011.












Abstract



LiCoyMn2−yO4 (y = 0.00, 0.04 and 0.08) were synthesized using a combustion method, and the electrochemical properties were examined in the voltage range of 3.5–5.0 V. The XRD patterns of the synthesized samples were similar, and the samples had a spinel phase structure. The first charge capacity curves exhibited an inflection in the voltage range of 4.2–5.0 V, where it is believed that additional, previously unreported phase transition occurs. The voltage vs. x curves for the first to fifth cycle exhibited two distinct voltage plateaus, corresponding well to a two-phase reaction and a one-phase reaction, respectively, as reported previously. For the voltage range of 3.5–5.0 V, the first discharge capacity increased and the cycling performance improved as y increased. Among these samples, LiCo0.08Mn1.92O4 had the largest first discharge capacity of 132.5 mA h/g at 600 μA/cm2, and its cycling efficiency was 91.1% at the 15th cycle in the voltage range of 3.5–5.0 V.





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