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송명엽,HoRim,방의용,SeongGuKang,장순호 한국세라믹학회 2003 한국세라믹학회지 Vol.40 No.6
The LiNi1-yCoyO2 samples were synthesized at 800℃ and 850℃, by the solid-state reaction method, from the various starting materials LiOH, Li2CO3, NiO, NiCO3, Co3O4 and CoCO3., and their electrochemical properties are investigated. The LiNi1-yCoyO2 prepared from Li2CO3, NiO and Co3O4 exhibited the -NaFeO2 structure of the rhombohedral system(space group; Rm). As the Co content increased, the lattice parameters a and c decreased. The reason is that the radius of Co ion is smaller than that of Ni ion. The increase in c/a shows that two-dimensional structure develops better as the Co content increases. The LiNi0.7Co0.3O2[HOO(800,0.3)] synthesized at 800℃ from LiOH, NiO and Co3O4 exhibited the largest first discharge capacity 162 mAh/g. The size of particles increases roughly as the valve of y increases. The samples with the larger particles have the larger first discharge capacities. The cycling performances of the samples with the first discharge capacity larger than 150mAh/g were investigated. The LiNi0.9Co0.1O2[COO(850,0.1)] synthesized at 850℃ from Li2CO3, NiO and Co3O4 showed an excellent cycling performance. The sample with the larger first discharge capacity will be under the more severe lattice destruction, due to the expansion and contraction of the lattice during intercalation and deintercalation, than the sample with the smaller first discharge capacity. As the first discharge capacity increases, the capacity fading rate thus increases.