Journal of the Korean Physical Society

Korean Physical Society (한국물리학회)
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Preparation of a Li7La3Zr1.5Nb0.5O12 Garnet Solid Electrolyte Ceramic by using Sol-gel Powder Synthesis and Hot Pressing and Its Characterization

  • Lee, Hee Chul (Department of Advanced Materials Engineering, Korea Polytechnic University) ;
  • Oh, Nu Ri (Department of Advanced Materials Engineering, Korea Polytechnic University) ;
  • Yoo, Ae Ri (Department of Advanced Materials Engineering, Korea Polytechnic University) ;
  • Kim, Yunsung (Department of Mechanical Engineering, University of Michigan) ;
  • Sakamoto, Jeff (Department of Mechanical Engineering, University of Michigan)
  • Received : 2018.05.29
  • Accepted : 2018.07.25
  • Published : 2018.11.30
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Abstract

In this study, we prepared and characterized Nb-doped $Li_7La_3Zr_{2-x}O_{12}$ (LLZNO) powder and pellets with a cubic garnet structure by using a modified sol-gel synthesis and hot pressing. LLZNO powder with a very small grain size and cubic structure without secondary phases could be obtained by using a synthesis method in which Li and La sources in a propanol solvent were mixed together with Zr and Nb sources in 2-methoxy ethanol. A pure cubic phase LLZNO pellet could be fabricated from the prepared LLZNO and an additional 6-wt% of $Li_2CO_3$ powder by hot pressing at $1050^{\circ}C$ and 15.8 MPa. The hot-pressed LLZNO pellet with a relative density of 99% exhibited a very dense surface morphology. The total Li ionic conductivity of the hot-pressed LLZNO was $7.4{\times}10^{-4}S/cm$ at room temperature, which is very high level compared to other reported values. The activation energy for ionic conduction was estimated to be 0.40 eV.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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