Journal
SOLID STATE IONICS
Volume 178, Issue 13-14, Pages 967-971Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2007.04.012
Keywords
cathode material; doping; rare earth element; cycling performance; charge-transfer resistance
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A series of cathode materials for lithium-ion batteries with the formula Li[Ni1/3Co1/3Mn1/3](1-x)RexO2(Re=La, Ce, Pr) have been synthesized using a sol-gel method with citric acid as chelating agent. The effect of rare earth elements doping on the structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were investigated by XRD, charge-discharge experiments and EIS. The results show that the discharge capacity and cycling performance of LiNi1/3Co1/3Mn1/3O2 have been greatly improved with rare earth elements doping. Characterization of EIS reveals that the increase of charge-transfer resistance during cycling has been suppressed successfully by rare earth elements doping. (C) 2007 Elsevier B.V. All rights reserved.
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