Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Microscopic Analysis of High Lithium-Ion Conducting Glass-Ceramic Sulfides

  • Park, Mansoo (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology) ;
  • Jung, Wo Dum (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology) ;
  • Choi, Sungjun (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology) ;
  • Son, Kihyun (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology) ;
  • Jung, Hun-Gi (Center for Energy Convergence, Korea Institute of Science and Technology) ;
  • Kim, Byung-Kook (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology) ;
  • Lee, Hae-Weon (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology) ;
  • Lee, Jong-Ho (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology) ;
  • Kim, Hyoungchul (High-Temperature Energy Materials Research Center, Korea Institute of Science and Technology)
  • Received : 2016.07.22
  • Accepted : 2016.08.25
  • Published : 2016.09.30
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Abstract

We explore the crystalline structure and phase transition of lithium thiophosphate ($Li_7P_3S_{11}$) solid electrolyte using electron microscopy and X-ray diffraction. The glass-like $Li_7P_3S_{11}$ powder is prepared by the high-energy mechanical milling process. According to the energy dispersive X-ray spectroscopy (EDS) and selected area diffraction (SAD) analysis, the glass powder shows chemical homogeneity without noticeable contrast variation at any specific spot in the specimen and amorphous SAD ring patterns. Upon heating up to $260^{\circ}C$ the glass $Li_7P_3S_{11}$ powder becomes crystallized, clearly representing crystal plane diffraction contrast in the high-resolution transmission electron microscopy image. We further confirm that each diffraction spot precisely corresponds to the diffraction from a particular $Li_7P_3S_{11}$ crystallographic structure, which is also in good agreement with the previous X-ray diffraction results. We expect that the microscopic analysis with EDS and SAD patterns would permit a new approach to study in the atomic scale of other lithium ion conducting sulfides.

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References

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