4.6 Article

Reactivity evaluation of NASICON-type solid electrolyte LATP, LAGP and Olivine-type cathode LCP

Journal

MATERIALS LETTERS
Volume 324, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.matlet.2022.132736

Keywords

All-Solid-State Lithium-ion batteries; Interface reaction; Low-temperature sintering

Funding

  1. MEXT [JPMXP0219207397]
  2. MEXT

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The chemical reactivity and thermal stability of NASICON-type solid lithium-ion conductive materials with Olivine-type cathode active material were evaluated. It was found that the LATP-LCP system can be sintered in air, forming a dense microstructure at 900 degrees C. On the other hand, the LAGP-LCP system melts at 800 degrees C. This study suggests that the LATP-LCP system is an excellent combination of electrolyte and cathode active material.
The chemical reactivity and thermal stability of the NASICON-type Li1.3Al0.3Ti1.7(PO4)3 (LATP) and Li1.5Al0.5Ge1.5(PO4)3 (LAGP) solid lithium-ion conductive materials with the Olivine-type LiCoPO4 (LCP) cathode active material were evaluated. The LATP or LAGP and LCP powders were mixed, uniaxially-pressed, and heat-treated in the air at 800, 900, and 1000 degrees C for 10 h. The obtained sintered bodies were crushed into powders, then characterized by X-ray diffraction and scanning electron microscopy together with energy-dispersive X-ray spectroscopy. LAGP-LCP decomposes and melts at 800 degrees C, and produces some different phases. On the other hand, LATP-LCP produces different phases at 900 degrees C, although it does not produce a different phase at 800 degrees C, thus forming a dense microstructure. This shows that the LATP-LCP system is an excellent combination of electrolyte and cathode active material that can be sintered in air. This mixed composite can also be used as a composite electrode in bulk-type lithium-ion batteries.

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