Journal
JOURNAL OF POWER SOURCES
Volume 220, Issue -, Pages 354-359Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.07.104
Keywords
Rate capability; 5 V spinel; Cathode; Co substitution; Lithium batteries
Funding
- WCU (World Class University) program through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [R31-10092]
- National Research Foundation of Korea [과C6A1908, R31-2012-000-10092-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The synthesis and the structural and morphological characterization of micro-sized, spherical LiNi0.5-xCo2xMn1.5-xO4 powders are reported. The results demonstrate that these materials have a high electronic conductivity as well as a high tap density. We show that when tested in a lithium cell the Co-substituted LiNi0.5-xCO2xMn1.5-xO4 electrodes exhibited a better cycling performance and a better rate capability than the Co-free LiNi0.5Mn1.5O4 parent cells. The enhanced electrochemical performances are attributed to the increase in electrical conductivity and in structural stability caused by Co substitution for Ni and Mn and the mixed valence effect of Mn3+/Mn4+. Due to these properties, the LiNi0.5-xCo2xMn1.5-xO4 electrodes are believed to be of importance for the progress of the lithium battery technology. (C) 2012 Elsevier B.V. All rights reserved.
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