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

    • 34 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.

    Original languageEnglish (US)
    Pages (from-to)612-620
    Number of pages9
    JournalJournal of Power Sources
    Volume275
    DOIs
    StatePublished - Feb 1 2015

    Profile

    Substitution reactions
    substitutes
    Immersion
    Garnets
    Lithium
    Phase transitions
    Oxides
    garnets
    lithium
    oxides
    Contamination
    Air
    contamination
    air
    Amoxapine
    Acridine Orange
    Lithium batteries
    Solid electrolytes
    Transport properties
    Ion exchange

    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

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

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

    Research output: Contribution to journalArticle

    @article{30368ab2f23e45d3a89606d556c3b1c5,
    title = "Phase transition in lithium garnet oxide ionic conductors Li7La3Zr2O12: The role of Ta substitution and H2O/CO2 exposure",
    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.",
    keywords = "Garnet oxide, Li ion conductor, Phase transition, Proton exchange, Ta substitution, Transport property",
    author = "Yuxing Wang and Wei Lai",
    year = "2015",
    month = "2",
    doi = "10.1016/j.jpowsour.2014.11.062",
    volume = "275",
    pages = "612--620",
    journal = "Journal of Power Sources",
    issn = "0378-7753",
    publisher = "Elsevier",

    }

    TY - JOUR

    T1 - Phase transition in lithium garnet oxide ionic conductors Li7La3Zr2O12

    T2 - Journal of Power Sources

    AU - Wang,Yuxing

    AU - Lai,Wei

    PY - 2015/2/1

    Y1 - 2015/2/1

    N2 - 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.

    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.

    KW - Garnet oxide

    KW - Li ion conductor

    KW - Phase transition

    KW - Proton exchange

    KW - Ta substitution

    KW - Transport property

    UR - http://www.scopus.com/inward/record.url?scp=84910678268&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84910678268&partnerID=8YFLogxK

    U2 - 10.1016/j.jpowsour.2014.11.062

    DO - 10.1016/j.jpowsour.2014.11.062

    M3 - Article

    VL - 275

    SP - 612

    EP - 620

    JO - Journal of Power Sources

    JF - Journal of Power Sources

    SN - 0378-7753

    ER -