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선양국,Sung Woo Oh,Sang-Ho Park,E. Jung,Young Chan Bae 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.7
The effects of substituting cobalt and fluorine for manganese and oxygen on the structural and electrochemical properties of Li[Ni0.5CoyMn1.5-y]O4-zFz cathode materials were studied. The pure phase Li[Ni0.5Coy Mn1.5-y]O4-zFz (y = 0 - 1.0, z = 0 - 0.1) spinel materials were successfully synthesized at 900 oC by an ultrasonic spray pyrolysis method. The Li[Ni0.5CoyMn1.5-y]O4-zFz (y = 0 - 1.0, z = 0 - 0.1) powders were characterized by means of X-ray diffraction (XRD), Rietveld refinements, scanning electron microscopy (SEM), energy dispersive spectra (EDS), Brunauer-Emmett-Teller (BET) analysis, and galvanostatic charge/discharge testing. The cobalt and fluorine substitutions were effective for improving the high current discharge capability, even though the electrode was cycled with a discharge current density of 1,350 mA g-1 (10 C-rate).
층간구조를 가지는 Li<sub>x</sub>Mn<sub>1-y</sub>M<sub>y</sub>O<sub>2</sub> (M = 전이금속) 양극활물질의 전기화학적 특성 연구
선양국,박상호,신선식 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.-
Lithiated transition metal oxides LiMO<sub>2</sub> (M = Co, Ni, Mn) have been extensively studied as cathode materials for commercial rechargeable lithium ion batteries. The layered LiMnO<sub>2</sub> are promising candidates as cathodes material because of their high theoretical capacity (285 mAh/g), low cost, abundance and nontoxic. Unfortunately, solid-state reaction at high temperature to prepare layered LiMnO<sub>2</sub> has been unsuccessful since the nonlayered structure such as spinel LiMn<sub>2</sub>O<sub>4</sub>, orthorhombic LiMnO<sub>2</sub>, or rock salt Li<sub>2</sub>MnO<sub>3</sub>. In order to obtain layered Li<sub>x</sub>MnO<sub>2</sub> structrue are required soft chemistry methods, but layered manganese oxides are transform to the spinel phases upon electrochemical cycling and this problems are associated with the Jahn-Teller distortion. In this work, a sol-gel method was employed to prepare transition metal doped Li<sub>x</sub>Mn<sub>1-y</sub>M<sub>y</sub>O<sub>2</sub> powders using glycolic acid as a chelating agent. The structural and electrochemical properties of the prepared materials were investigated using various analytical techniques and correlated to explain the electrochemical activity of the materials. This materials shows that the initial capacity is over 180 mAh/g with excellent cyclability in the 2.4-45 V range. The transition metal doped layered structure is very effective to increase the cycle performance of Li<sub>x</sub>Mn<sub>1-y</sub>M<sub>y</sub>O<sub>2</sub> layered.