Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Enhanced Stability of LiCoO2 Cathodes in Lithium-ion Batteries Using Surface Modification by Atomic Layer Deposition

  • Jung, Yoon-S. (Department of Mechanical Engineering, University of Colorado at Boulder) ;
  • Cavanagh, Andrew S. (Department of Physics, University of Colorado at Boulder) ;
  • Dillon, Anne C. (National Renewable Energy Laboratory) ;
  • Groner, Markus D. (Department of Chemistry and Biochemistry and Department of Chemical and Biological Engineering, University of Colorado at Boulder) ;
  • George, Steven M. (ALD NanoSolutions Inc.) ;
  • Lee, Se-Hee (WCU Hybrid Materials, Seoul National University)
  • Published : 2010.01.31
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Abstract

Ultrathin atomic layer deposition (ALD) coatings were found to enhance the performance of lithium-ion batteries (LIBs). Previous studies have demonstrated that $LiCoO_2$ cathode powders coated with metal oxides with thicknesses of $\sim100-1000{\AA}$ grown using wet chemical techniques improved LIB performance. In this study, $LiCoO_2$ powders were coated with conformal $Al_2O_3$ ALD films with thicknesses of only $\sim3-4{\AA}$ established using 2 ALD cycles. The coated $LiCoO_2$ powders exhibited a capacity retention of 89% after 120 charge-discharge cycles in the 3.3~4.5 V (vs. $Li/Li^+$) range. In contrast, the bare $LiCoO_2$ powders displayed only a 45% capacity retention. This dramatic improvement may result from the ultrathin $Al_2O_3$ ALD film acting to minimize Co dissolution or to reduce surface electrolyte reactions.

Keywords

References

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