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Trends in Applied Sciences Research
  Year: 2006 | Volume: 1 | Issue: 1 | Page No.: 15-24
 
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Electrochemical Properties of Cathode Materials LiNiO2 and LiNi1-yMyO2 (M = Zn2+, Al3+ and Ti4+)

M.Y. Song and D.S. Lee

Abstract:
LiNi1-yTiyO2 (y = 0.000, 0.012, 0.025, 0.050, 0.100 and 0.150) were synthesized by ball milling and the solid- state reaction method. The optimum condition to synthesize a cathode material LiNi0.975Ti0.025O2 is milling for 28 h and then preheating at 600°C for 16 h and finally calcining at 750°C for 30 h O2 stream. LiNi1-yTiyO2 (0≤y≤0.150) synthesized under this optimum condition have the α-NaFeO2 structure of the rhombohedral system (space group; R m). The values of I003/I104 for y = 0.000, 0.012 and 0.025 are near 1.2, indicating these samples have the phase with the nearly stoichiometric composition. The samples with y = 0, 0.012 and 0.025 show good splitting of 006 and 102 peaks and of 108 and 110 peaks, indicating the decrease in cation mixing. The particle size decreases as the value of y increases. All the samples except that with y = 0.000 exhibit relatively homogeneous particle size. The voltage vs. discharge capacity curves for y = 0.012 and y = 0.025 exhibit three distinct plateaus corresponding to phase transitions. Among LiNi1-yTiyO2 (0 = y = 0.150), LiNi0.975Ti0.025O2 has the largest first discharge capacity 154.8mAhg-1 and the relatively good cycling performance (77% at n = 10). For Ti in the composition LiNi0.975Ti0.025O2, Zn2+ and Al3+ were substituted. Electrochemical studies of LiNi0.975M0.025O2 (M = Zn2+, Al3+ and Ti4+) show that the plateaus in the voltage vs. discharge capacity curve become more distinct and the voltage of the plateau corresponding to the phase transition from M to H1 increases as M varies from Zn2+ to Al3+ and then to Ti4+. LiNi0.975Ti0.025O2 has the largest first discharge capacity and a relatively good cycling performance compared with LiNi0.975M0.025O2 (M = Zn2+ and Al3+). This sample has the largest value of c/a and the smallest particles. LiNi0.975Al0.025O2 has the best cycling performance (98% at n = 10).
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How to cite this article:

M.Y. Song and D.S. Lee , 2006. Electrochemical Properties of Cathode Materials LiNiO2 and LiNi1-yMyO2 (M = Zn2+, Al3+ and Ti4+). Trends in Applied Sciences Research, 1: 15-24.

URL: https://scialert.net/abstract/?doi=tasr.2006.15.24

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