Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Preparation of Sintering Aid for Li7La3Zr2O12 Solid Electrolyte by Heat-treatment of Polymeric Precursors Containing Li and B

Li과 B이 포함된 폴리머 전구체의 열처리에 의한 Li7La3Zr2O12 고체전해질의 소결조제 합성

  • Shin, Ran-Hee (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Ryu, Sung-Soo (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
  • 신란희 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 류성수 (한국세라믹기술원 이천분원 엔지니어링세라믹센터)
  • Received : 2018.04.24
  • Accepted : 2018.04.27
  • Published : 2018.04.28
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Abstract

In this study, the compound $Li_3BO_3$ (LBO) is intended to be prepared by a polymeric complex method as a sintering aid for the densification of $Li_7La_3Zr_2O_{12}$ (LLZ) solid electrolyte. A polymeric precursor containing Li and B is heat-treated in an air atmosphere at a temperature range between $600^{\circ}C$ and $800^{\circ}C$. Instead of LBO, the compound $Li_{2+x}C_{1-x}B_xO_3$ (LCBO) is unexpectedly synthesized after a heat-treatment of $700^{\circ}C$. The effect of LCBO addition on sintering behavior and ion conductivity of LLZ is studied. It is found that the LCBO compound could lead to significant improvements in the densification and ionic conductivity of LLZ compared to pure LLZ. After sintering at $1100^{\circ}C$, the density of the LLZ-12wt%LBO composite is $3.72g/cm^3$, with a high Li-ion conductivity of $1.18{\times}10^{-4}Scm^{-1}$ at $28^{\circ}C$, while the pure LLZ specimen had a densify of $2.98g/cm^3$ and Li-ion conductivity of $5.98{\times}10^{-6}Scm^{-1}$.

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