Lowering the sintering temperature of Li7La3Zr2O12 electrolyte for co-fired all-solid-state batteries via partial Bi substitution and precise control of compositional deviation

Ken Watanabe, Ayumu Tashiro, Yoshihiro Ichinose, Shinichi Takeno, Koichi Suematsu, Kazutaka Mitsuishi, Kengo Shimanoe

Research output: Contribution to journalArticlepeer-review

Abstract

Li7La3Zr2O12 (LLZ) has great potential as a solid electrolyte for co-fired all-solid-state Li-ion secondary batteries. However, to realise a solid-state battery using LLZ, the sintering temperature of LLZ should be reduced to one that can suppress the formation of a high-resistance reaction layer at the interface between LLZ and the electrode. In this study, we demonstrate an effective method for reducing the sintering temperature of Li6La3ZrTaO12 by combining partial Bi-substitution for Ta and precise control of the compositional deviation. The intentional tuning of the La deficiency in Li6La3ZrTa0.8Bi0.2O12 (LLZTB0.2) promoted the formation of a liquid phase based on Li2OBi2O3 at the grain boundary, resulting in its densification at 775 °C. Furthermore, we fabricated a co-fired all-solid-state half-cell based on an LLZTB0.2 electrolyte attached to a LiCoO2 + LLZTB0.2 composite electrode and a half-cell operated at 60 °C. From these results, it was found that the proposed concept is effective in reducing the sintering temperature of LLZ and is applicable for co-firing an all-solid-state battery.

Original languageEnglish
Pages (from-to)416-423
Number of pages8
JournalJournal of the Ceramic Society of Japan
Volume130
Issue number7
DOIs
Publication statusPublished - Jul 1 2022

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Lowering the sintering temperature of Li7La3Zr2O12 electrolyte for co-fired all-solid-state batteries via partial Bi substitution and precise control of compositional deviation'. Together they form a unique fingerprint.

Cite this