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Optimizing Li1.3Al0.3Ti1.7(PO4)3 Particle Sizes toward High Ionic Conductivity.

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Summary

The size of Lithium Aluminum Titanium Phosphate (LATP) particles significantly impacts ionic conductivity. Medium-sized LATP particles (2 μm) exhibit optimal microstructure and high conductivity for solid electrolytes.

Keywords:
Li+ conductivityLi1.3Al0.3Ti1.7(PO4)3particle sizessinteringsolid electrolytes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • NASICON-type Lithium Aluminum Titanium Phosphate (LATP) is a promising solid electrolyte due to its high ionic conductivity and stability.
  • The influence of primary particle size on LATP's ionic conductivity remains underexplored.

Purpose of the Study:

  • To investigate the effect of LATP primary particle size on ionic conductivity.
  • To analyze the relationship between particle size, microstructure, and electrochemical properties of LATP ceramics.

Main Methods:

  • Preparation of LATP particles with varying sizes.
  • Characterization of morphology, relative density, phase composition, and microstructure.
  • Measurement of ionic conductivity and activation energy.
  • Fabrication and testing of Li-Li symmetric cells and Li-LFP batteries.

Main Results:

  • Medium-sized LATP particles (2 μm) yielded a superior microstructure with >97% relative density.
  • The highest ionic conductivity of 6.7 × 10-4 S cm-1 and an activation energy of 0.418 eV were achieved with medium-sized particles.
  • Fabricated Li-Li symmetric cells and Li-LFP batteries demonstrated good electrochemical performance.

Conclusions:

  • LATP particle size is a critical factor influencing ionic conductivity and electrochemical performance.
  • Optimizing particle size is essential for developing high-performance LATP solid electrolytes.
  • This study provides significant insights into the structure-property relationships in LATP ceramics.