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논문 기본 정보

자료유형
학술저널
저자정보
권성남 (전북대학교) Daniel R. Mumm (University of California Irvine) 박혜령 (전남대학교) 송명엽 (전북대학교)
저널정보
한양대학교 세라믹공정연구센터 Journal of Ceramic Processing Research Journal of Ceramic Processing Research 제17권 제6호
발행연도
2016.6
수록면
653 - 658 (6page)

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LiNiO2 and LiNi0.975Ga0.025O2 samples were synthesized by the combustion method. The starting materials, in desiredproportions, were dissolved in distilled water and mixed with urea by a magnetic stirrer. The mixture was calcined at 750 oCfor 36 h in an O2 stream after preheating at 400 oC for 30 min in air. The phase transitions during charging and dischargingand electrochemical performances of the synthesized samples were then investigated. The dQ/|dV| vs. voltage curves, whereQ is the charge capacity and V is the voltage, for the charge and discharge of LiNiO2 and LiNi0.975Ga0.025O2 at n (number ofcycles) = 1 and n = 2 exhibit four peaks, respectively, indicating four phase transitions from a hexagonal structure (H1) to amonoclinic structure (M), from the M to a second hexagonal structure (H2), from the H2 to H2 and a third hexagonal structure(H3), and from the H2 + H3 to H3 or vice versa. LiNi0.975Ga0.025O2 had a larger first discharge capacity of 166 mA h/g thanLiNiO2. It showed a cycling performance, which is not bad, with a discharge capacity degradation rate of 0.76 mA h/g/cyclefrom n = 1 to n = 50. LiNiO2 had a smaller first discharge capacity of 158 mA h/g but a better cycling performance thanLiNi0.975Ga0.025O2 with a discharge capacity degradation rate of 0.45 mA h/g/cycle from n = 1 to n = 50. The electrochemicalproperties of LiNi0.975Ga0.025O2 prepared by the combustion method were compared with those of the sample prepared by thesolid-state reaction method.

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