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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 11
BKCSDE 30(11)
November 20, 2009 

Structures and Electrochemical Properties of LiNi0.5-xCo2xMn0.5-xO2
as Cathode Materials for Lithium-ion Batteries
Hyun Chul Choi, Ho Jin Kim, Yeon Uk Jeong*, Soo Hwan Jeong, In Woo Cheong, Uoo Chang Jung
Secondary lithium batteries, Cathode materials, XRD, XPS, Electrochemical properties
LiNi0.5-xCo2xMn0.5-xO2 (x = 0, 0.1, 1/6, 1.2, 0.3) were synthesized by the solid-state reaction method. The crystal structure was analyzed by X-ray powder diffraction and Rietveld refinement. LiNi0.5-xCo2xMn0.5-xO2 samples give single phases of hexagonal layered structures with a space group of R-3m for x = 0.1, 1/6, 0.2, and 0.3. The lattice constants of a and c-axis were decreased with the increase in Co contents in samples. The thickness of MO2 slab was decreased and inter-slab distance was increased with the increase in Co contents in LiNi0.5-xCo2xMn0.5-xO2. According to XPS analysis, the valence states of Mn, Co, and Ni in the sample are mainly +4, +3, and +3, respectively. The discharge capacity of 202 mAh/g at 0.1C-rate in the potential range of 4.7 - 3.0 V was obtained in LiNi0.3Co0.4 Mn0.3O2 sample, and LiNi0.4Co0.2Mn0.4O2 gives excellent cycle performance in the same potential range.
2603 - 2607
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