화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.13, No.7, 1174-1179, December, 2007
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Improved High-rate Capability of Li[Ni0.5CoyMn1.5-y]O4-zFz Spinel Materials for 5 V Lithium Secondary Batteries
Sung Woo Oh, Sang-Ho Park1, E. Jung2, Young Chan Bae, and Yang-Kook Sun†
  • Department of Chemical Engineering, Center for Information and Communication Materials, Hanyang University, Seoul 133-791, Korea
  • 1Argonne National Laboratory, 9700 S. Cass Ave, Argonne, IL 60439, USA
  • 2Department of Digital Culture & Contents, Dong-Eui University, Busan 614-714, Korea
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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[Ni0.5CoyMn1.5-y]O4-zFz (y = 0 - 1.0, z = 0 - 0.1) spinel materials were successfully synthesized at 900 ℃ 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).
Keywords:high rate property;5 V spinel;fluorine doping;cobalt doping;cathode materials
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