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Received February 20, 2008
Accepted May 7, 2008
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Preparation, electrochemical properties, and cycle mechanism of Li1-xFe0.8Ni0.2O2-LixMnO2 (Mn/(Fe+Ni+Mn)=0.8) materia
Faculty of Applied Chemical Engineering, Center for Functional Nano Fine Chemicals, Chonnam National University, 300 Yongbong-dong, Gwang-ju 550-757, Korea 1Energy Business Division Development Team, Samsung SDI Co. Ltd., 508 Sungsung-dong, Cheonan 330-300 Korea 2Korea Electrical Engineering & Science Research Institute, Seoul National University, San 56-1 Sillim-dong, Seoul 151-742, Korea
Korean Journal of Chemical Engineering, November 2008, 25(6), 1389-1396(8), 10.1007/s11814-008-0228-6
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Abstract
A new type of Li1-xFe0.8Ni0.2O2-LixMnO2 (Mn/(Fe+Ni+Mn)=0.8) material was synthesized at 350 ℃ in an air atmosphere by a solid-state reaction. The material had an XRD pattern that closely resembled that of the original Li1-xFeO2-LixMnO2 ((Fe+Ni+Mn)=0.8) with much reduced impurity peaks. It was composed of many large particles of about 500-600 nm and small particles of about 100-200 nm, which were distributed among the larger particles. The Li/Li1-xFe0.8Ni0.2O2-LixMnO2 cell showed a high initial discharge capacity above 192 mAh/g, which was higher than_x000D_
that of the parent Li/Li1-xFeO2-LixMnO2 (186 mAh/g). This cell exhibited not only a typical voltage plateau in the 2.8 V region, but also an excellent cycle retention rate (96%) up to 45 cycles. We suggest a unique role of doped nickel ion in the Li/Li1-xFe0.8Ni0.2O2-LixMnO2 cell, which results in the increased initial discharge capacity from the redox reaction of Ni2+/Ni3+ between 2.0 and 1.5 V region.
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Jang DH, Shin YJ, Oh SM, J. Electrochem. Soc., 143(7), 2204 (1996)
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Kanno R, Shirane T, Kawamoto Y, Takeda Y, Takano M, Ohashi M, Yamaguchi Y, J. Electrochem. Soc., 143(8), 2435 (1996)
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Sakurai Y, Arai H, Okada S, Yamaki J, J. Power Sources, 68(2), 711 (1997)
Sakurai Y, Arai H, Yamaki J, Solid State Ionics, 113-115, 29 (1998)
Lee YS, Sato S, Tabuchi M, Yoon CS, Sun YK, Kobayakawa K, Sato Y, Electrochem. Comm., 5, 549 (2003)
Lee YS, Sato S, Sun YK, Kobayakawa K, Sato Y, Electrochem. Comm., 5, 359 (2003)
Lee YS, Yoon CS, Sun YK, Kobayakawa K, Sato Y, Electrochem. Comm., 4, 727 (2002)
Lee YS, Yoshio M, Electrochem. Solid State Lett., 4(10), A166 (2001)
Lee YS, Yoon CS, Sun YK, Yoshio M, Electrochem. Solid State Lett., 5(1), A1 (2002)
Youn SG, Lee IH, Yoon CS, Kim CK, Sun YK, Lee YS, Yoshio M, J. Power Sources, 108(1-2), 97 (2002)
Ito Y, Idemoto Y, Tsunoda Y, Koura N, J. Power Sources, 119, 733 (2003)
Ikuta H, Takanaka K, Wakihara M, Electrochim. Acta, 414, 227 (2004)
Park SH, Sun YK, Park KS, Nahm KS, Lee YS, Yoshio M, Electrochim. Acta, 47(11), 1721 (2002)