Phase transition in lithium garnet oxide ionic conductors Li7La3Zr2O12: The role of Ta substitution and H2O/CO2 exposure

Yuxing Wang, Wei Lai

Research output: Contribution to journalArticle

  • 48 Citations

Abstract

High Li-content lithium garnet oxides are promising solid electrolyte materials for lithium batteries. Being the highest Li-content lithium garnet oxides, Li7La3Zr2O12 has been reported to crystallize in either the tetragonal or cubic phase with no consensus on the exact conditions under which these two phases are formed, which may be due to unintentional Al contamination and air exposure. In this work, the effects of Ta substitution and H2O/CO2 exposure have been studied under Al-contamination free conditions with minimal air exposure. We showed that 1) the Ta-substitution induced phase transition occurred through a two-phase mechanism and a minimum 0.6 mol of Ta substitution to Zr is needed to stabilize the cubic phase; 2) H2O and CO2 can individually induce the tetragonal-cubic phase transition in Li7La3Zr2O12 through proton exchange and Li extraction, respectively, which can have great influence on the transport properties of Li7La3Zr2O12.

LanguageEnglish (US)
Pages612-620
Number of pages9
JournalJournal of Power Sources
Volume275
DOIs
StatePublished - Feb 1 2015

Profile

Garnets
Lithium
garnets
Oxides
Substitution reactions
conductors
lithium
Phase transitions
Carbon Monoxide
substitutes
oxides
contamination
Contamination
Lithium batteries
lithium batteries
air
Solid electrolytes
solid electrolytes
Air
Transport properties

Keywords

  • Garnet oxide
  • Li ion conductor
  • Phase transition
  • Proton exchange
  • Ta substitution
  • Transport property

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Phase transition in lithium garnet oxide ionic conductors Li7La3Zr2O12 : The role of Ta substitution and H2O/CO2 exposure. / Wang, Yuxing; Lai, Wei.

In: Journal of Power Sources, Vol. 275, 01.02.2015, p. 612-620.

Research output: Contribution to journalArticle

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AB - High Li-content lithium garnet oxides are promising solid electrolyte materials for lithium batteries. Being the highest Li-content lithium garnet oxides, Li7La3Zr2O12 has been reported to crystallize in either the tetragonal or cubic phase with no consensus on the exact conditions under which these two phases are formed, which may be due to unintentional Al contamination and air exposure. In this work, the effects of Ta substitution and H2O/CO2 exposure have been studied under Al-contamination free conditions with minimal air exposure. We showed that 1) the Ta-substitution induced phase transition occurred through a two-phase mechanism and a minimum 0.6 mol of Ta substitution to Zr is needed to stabilize the cubic phase; 2) H2O and CO2 can individually induce the tetragonal-cubic phase transition in Li7La3Zr2O12 through proton exchange and Li extraction, respectively, which can have great influence on the transport properties of Li7La3Zr2O12.

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