Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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The Structural and Electrochemical Properties of Thermally Aged Li[Co0.1Ni0.15Li0.2Mn0.55]O2 Cathodes

  • Park, Yong-Joon (Division of Advanced Industrial Engineering, Kyonggi University) ;
  • Lee, Ju-Wook (Semiconductor Process Team, Electronics and Telecommunications Research Institute) ;
  • Lee, Young-Gi (Ionics Device Team, Electronics and Telecommunications Research Institute) ;
  • Kim, Kwang-Man (Ionics Device Team, Electronics and Telecommunications Research Institute) ;
  • Kang, Man-Gu (Ionics Device Team, Electronics and Telecommunications Research Institute) ;
  • Lee, Young-Il (Department of Chemistry, University of Ulsan)
  • Published : 2007.12.20
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Abstract

As a cathode material of lithium rechargeable batteries, charged Li[Co0.1Ni0.15Li0.2Mn0.55]O2 electrodes, which were aged thermally at 25 oC and 90 oC respectively, were characterized by means of charge/discharger, impedance spectroscopy, and X-ray diffraction. The discharge capacity diminution of the electrodes aged at 25 oC and 90 oC for 1 week was 4% and 23%, respectively. The cell aged at 25 oC was recovered on cycling. However, the capacity loss after ageing at 90 oC was not recovered in a subsequent cycling test, which demonstrates that the reaction occurring during ageing at 90 oC is irreversible. A significant impedance increase of aged electrode at 90 oC is associated with irreversible capacity loss. The structural changes including phase transformation were not detected by XRD analysis, because it could be due to out of detection limit. After ageing, impedance was slightly decreased during subsequent cycling test. It could be explained the cyclic performance of aged sample is stable. The thermal stability was not deteriorated by ageing even at the high temperature of 90 oC.

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References

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