한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제53권6호
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  • Pages.712-718
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  • 2016
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  • 1229-7801(pISSN)
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  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
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Effect of Li3BO3 Additive on Densification and Ion Conductivity of Garnet-Type Li7La3Zr2O12 Solid Electrolytes of All-Solid-State Lithium-Ion Batteries

  • Shin, Ran-Hee (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Son, Sam-Ick (Central Research Institute, Hyundai Motors) ;
  • Lee, Sung-Min (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Han, Yoon Soo (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Yong Do (Department of Materials Science & Engineering, Hanyang University) ;
  • Ryu, Sung-Soo (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
  • 투고 : 2016.10.04
  • 심사 : 2016.10.28
  • 발행 : 2016.11.30
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초록

In this study, we investigate the effect of the$Li_3BO_3$ additive on the densification and ionic conductivity of garnet-type $Li_7La_3Zr_2O_{12}$ solid electrolytes for all-solid-state lithium batteries. We analyze their densification behavior with the addition of $Li_3BO_3$ in the range of 2-10 wt.% by dilatometer measurements and isothermal sintering. Dilatometry analysis reveals that the sintering of $Li_7La_3Zr_2O_{12}-Li_3BO_3$ composites is characterized by two stages, resulting in two peaks, which show a significant dependence on the $Li_3BO_3$ additive content, in the shrinkage rate curves. Sintered density and total ion conductivity of the system increases with increasing $Li_3BO_3$ content. After sintering at $1100^{\circ}C$ for 8 h, the $Li_7La_3Zr_2O_{12}-8$ wt.% $Li_3BO_3$ composite shows a total ionic conductivity of $1.61{\times}10^{-5}Scm^{-1}$, while that of the pure $Li_7La_3Zr_2O_{12}$ is only $5.98{\times}10^{-6}Scm^{-1}$.

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