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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Aqueous Cold Sintering of Li-Based Compounds.

Linhao Li1,2, Jessica Andrews2, Ria Mitchell2

  • 1College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, China.

ACS Applied Materials & Interfaces
|April 13, 2023
PubMed
Summary
This summary is machine-generated.

Aqueous cold sintering successfully densified lithium lanthanum zirconium aluminum oxide (LLZAO) and lithium cobalt oxide (LCO) ceramics. Using LiCl solution improved LLZAO conductivity, and textured LCO-LLZAO composites showed superior electronic conductivity.

Keywords:
LCOLLZOceramic compositecold sinteringprefer orientationsolid electrolytetextured ceramic

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Electrochemistry

Background:

  • Developing solid electrolytes and cathode materials is crucial for advanced lithium-ion batteries.
  • Conventional sintering methods can be energy-intensive and may not yield optimal material properties.

Purpose of the Study:

  • To investigate aqueous cold sintering for lithium-based electrolyte (LLZAO) and cathode (LCO) materials.
  • To enhance the ionic and electronic conductivity of these materials through optimized processing.

Main Methods:

  • Aqueous cold sintering of LLZAO and LCO-LLZAO composites.
  • Characterization using scanning electron microscopy and X-ray computer tomography.
  • Electrical conductivity measurements at room temperature.

Main Results:

  • Achieved high relative densities for both LLZAO (~87%) and LCO-LLZAO (~95%).
  • Identified Li2CO3 as a grain boundary blocking layer in as-sintered LLZAO, reducing conductivity.
  • Replacing deionized water with 5 M LiCl during cold sintering significantly increased LLZAO conductivity to ~3 × 10^-5 S/cm.
  • [001] texturing in LCO-LLZAO composites led to anisotropic electronic conductivity, with values up to ~10^-2 S/cm parallel to the c-axis.

Conclusions:

  • Aqueous cold sintering is a viable method for processing LLZAO and LCO-LLZAO.
  • LiCl-assisted cold sintering effectively mitigates grain boundary resistance in LLZAO.
  • Textured LCO-LLZAO composites exhibit excellent electronic conductivity, surpassing conventionally sintered materials.