Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Structural Stability During Charge-Discharge Cycles in Zr-doped LiCoO2 Powders

충방전 과정중 구조가 안정한 Zr이 도핑된 LiCoO2 분말

  • Kim, Seon-Hye (Faculty of Engineering, Kyushu University) ;
  • Shim, Kwang-Bo (Division of Advanced Materials Science and Engineering, Hanyang University) ;
  • Ahn, Jae-Pyoung (Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • Kim, Chang-Sam (Battery Research Center, Korea Institute of Science and Technology)
  • 김선혜 (큐슈대학교 수소이용기술연구센터) ;
  • 심광보 (한양대학교 신소재공학과) ;
  • 안재평 (한국과학기술연구원 특성분석센터) ;
  • 김창삼 (한국과학기술연구원 이차전지연구센터)
  • Published : 2008.03.31
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Abstract

Zirconium-doped $Li_{1.1}Co_{1-x}Zr_xO_2(0{\leq}x{\leq}0.05)$ powders as cathode materials for lithium ion batteries were synthesized using an ultrasonic spray pyrolysis method. Cyclic voltammetry and cyclic stability tests were performed, and the changes of microstructure were observed. The solubility limit of zirconium into $Li_{1.1}CoO_2$ was less than 5 mol%, and monoclinic $Li_2ZrO_3$ phase was formed above the limit. The Zr-doping suppressed the grain growth and increased the lattice parameters of the hexagonal $LiCoO_2$ phase. The Zr-dopiong of 1mol% resulted in the best cyclic performance in the range of $3.0{\sim}4.3V$ at 1C rate (140 mA/g); the initial discharge capacity decreased from 158 mAh/g to 60 mAh/g in the undoped powder, while from 154 mAh/g to 135 mAh/g in the Zr-doped powder of 1 mol% after 30 cycles. The excellent cycle stability of Zr-doped powder was due to the low polarization during chargedischarge processes which resulted from the delayed collapse of the crystal structure of the active materials with Zr-doping.

Keywords

References

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