Journal of the Korean Physical Society

  • 제73권10호
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  • Pages.1535-1540
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  • 2018
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  • 0374-4884(pISSN)
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  • 1976-8524(eISSN)
한국물리학회 (Korean Physical Society)
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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)
  • 투고 : 2018.05.29
  • 심사 : 2018.07.25
  • 발행 : 2018.11.30
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

연구 과제 주관 기관 : National Research Foundation of Korea (NRF)

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피인용 문헌

  1. Effect of Ga-Bi Co-doped on Structural and Ionic Conductivity of Li7La3Zr2O12 Solid Electrolytes Derived from Sol-Gel Method vol.48, pp.12, 2018, https://doi.org/10.1007/s11664-019-07607-7
  2. Tri-Doping of Sol-Gel Synthesized Garnet-Type Oxide Solid-State Electrolyte vol.12, pp.2, 2018, https://doi.org/10.3390/mi12020134
  3. Effect of Sintering Process on Ionic Conductivity of Li7-xLa3Zr2-xNbxO12 (x = 0, 0.2, 0.4, 0.6) Solid Electrolytes vol.14, pp.7, 2018, https://doi.org/10.3390/ma14071671
  4. Molecular reconfigurations enabling active liquid-solid interfaces for ultrafast Li diffusion kinetics in the 3D framework of a garnet solid-state electrolyte vol.9, pp.31, 2021, https://doi.org/10.1039/d1ta03569j