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J. Korean Ceram. Soc. > Volume 40(7); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(7): 620.
doi: https://doi.org/10.4191/kcers.2003.40.7.620
Discharge Capacity Fading of LiCoyMn2-yO4 with Cycling
Ik-Hyun Kwon, Myoung-Youp Song
Division of Advanced Materials Engineering, Research Center of Advanced Materials Development, Engineering Research Institute, Chonbuk National University
ABSTRACT
LiCo$_{y}$Mn$_{2-y}$O$_4$ samples were synthesized by calcining a mixture of LiOH.$H_2O$, MnO$_2$ (CMD) and CoCO$_3$ calcining at 40$0^{circ}C$ for 10 h and then calcining twice at 75$0^{circ}C$ for 24 h in air with intermediate grinding. All the synthesized samples exhibited XRD patterns for the cubic spinel phase with a space group Fd(equation omitted)m. The electrochemical cells were charged and discharged for 30 cycles at a current density 600 $mutextrm{A}$/$textrm{cm}^2$ between 3.5 and 4.3 V. As the value of y increases, the size of particles becomes more homogeneous. The first discharge capacity decreases as the value of y increases, its value for y=0.00 being 92.8 mAh/g. The LiMn$_2$O$_4$ exhibits much better cycling performance than that reported earlier. The cycling performance increases as the value of y increases. The efficiency of discharge capacity is 98.9% for y=0.30. The larger lattice parameter for the smaller value of y is related to the larger discharge capacity. The more quantity of the intercalated and the deintercalated Li in the sample with the larger discharge capacity brings about the larger capacity fading rate.ate.
Key words: ${LiCo_{y}}{Mn_{2-y}}{O_4}$, Solid-state reaction method, The first discharge capacity, Cycling performance, Capacity fading rate
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