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A Simple and Highly Efficient Method toward High-Density Garnet-Type LLZTO Solid-State Electrolyte.

Fei Shen1,2, Weichang Guo1, Dingyuan Zeng1

  • 1State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.

ACS Applied Materials & Interfaces
|June 11, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a fast oxygen-assisted sintering method to eliminate pores in garnet-type lithium lanthanum zirconium oxide (LLZO) solid electrolytes. This method significantly improved ionic conductivity and mechanical properties for better solid-state lithium battery performance.

Keywords:
c-LLZOdense ceramichigh strengthoxygen-assisted sinteringsolid-state electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Garnet-type Li7La3Zr2O12 (LLZO) is a promising solid electrolyte for solid-state lithium batteries.
  • High-density LLZO is crucial for preventing lithium dendrite growth.
  • Pores in LLZO hinder ionic conductivity and density, limiting battery performance.

Purpose of the Study:

  • Investigate pore formation in Li6.4La3Zr1.4Ta0.6O12 (LLZTO).
  • Develop a fast oxygen-assisted sintering method to eliminate pores.
  • Enhance the ionic conductivity, density, and mechanical properties of LLZTO.

Main Methods:

  • Studied pore formation mechanisms in LLZTO.
  • Employed a rapid oxygen-assisted sintering technique.
  • Characterized sintered LLZTO pellets for physical and electrochemical properties.

Main Results:

  • Oxygen-assisted sintering effectively eliminated pores in LLZTO.
  • Achieved enhanced ionic conductivity (6.13 × 10^-4 S cm^-1) and Vickers hardness (9.82 GPa).
  • Demonstrated improved cycling stability in Li||Li symmetric cells at higher current densities.

Conclusions:

  • Fast oxygen-assisted sintering is a superior method for preparing dense LLZTO electrolytes.
  • The enhanced properties of LLZTO promote safer and more efficient solid-state lithium batteries.