Domain boundaries and their influence on Li migration in solid-state electrolyte (La,Li)TiO3

Hiroki Moriwake, Xiang Gao, Akihide Kuwabara, Craig A.J. Fisher, Teiichi Kimura, Yumi H. Ikuhara, Keiichi Kohama, Takeshi Tojigamori, Yuichi Ikuhara

    Research output: Contribution to journalArticlepeer-review

    39 Citations (Scopus)

    Abstract

    The influence of 90° domain boundaries in (La,Li)TiO3 (LLTO) on the Li conduction mechanism has been examined by a combination of state-of-the-art electron microscopy techniques and first-principles calculations. The atomistic structure of 90° domain boundaries in LLTO was determined from aberration-corrected scanning transmission electron microscopy images. At 90° domain boundaries, each perovskite unit of one domain is connected by an La-rich layer to units of the neighboring domain. First-principles calculations of a model domain boundary show that Li migration through the La layer has a very high activation energy, Ea, of 3.58 eV, indicating that La layers serve to block Li migration. However, if La vacancies are present within La layers, the migration energy decreases significantly to 0.58 eV, a value more in line with experimental observation. The results show that Li conduction in LLTO is strongly influenced by 90° domain boundaries. The activation energy in a single crystal (Ea = 0.19 eV) is much lower, suggesting that if 90° domain boundaries could be eliminated, an increase in conductivity of approximately three orders of magnitude compared with conventional LLTO could be achieved.

    Original languageEnglish
    Pages (from-to)203-207
    Number of pages5
    JournalJournal of Power Sources
    Volume276
    DOIs
    Publication statusPublished - 2015 Feb 15

    Keywords

    • Domain boundary
    • First-principles calculations
    • Lanthanum lithium titanate
    • Lithium-ion battery
    • Scanning transmission electron microscopy
    • Solid electrolyte

    ASJC Scopus subject areas

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

    Fingerprint Dive into the research topics of 'Domain boundaries and their influence on Li migration in solid-state electrolyte (La,Li)TiO<sub>3</sub>'. Together they form a unique fingerprint.

    Cite this