Evidence of two-phase formation upon lithium insertion into the Li{sub 1.33}Ti{sub 1.67}O{sub 4} spinel

Journal Article · Mon Mar 01 04:00:00 EST 1999 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1391692· OSTI ID:345368

Scharner, S; Weppner, W; Schmid-Beurmann, P ^[1]

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1. Christian-Albrechts-Univ. zu Kiel (Germany)

Li{sub 1.33}Ti{sub 1.6}7O{sub 4} synthesized from Li{sub 2}CO{sub 3} and TiO{sub 2} was electrochemically inserted with lithium at room temperature. The defect spinel Li{sub 1.33}Ti{sub 1.67}O{sub 4} and the fully lithiated Li{sub 2.33}Ti{sub 1.67}O{sub 4} with ordered rock-salt-type structure show nearly identical X-ray diffractions. Due to similar lattice constants of both phases and the low scattering factor of the lithium ions, the identification of the insertion mechanism using X-ray powder diffraction is possible only by using high angle X-ray scans of several samples inserted with different amounts of lithium. Precise analysis of the obtained data supplies the evidence for the presence of two distinct phases which are mutually interconvertible upon lithium exchange. This result is in good agreement with electrochemical data postulating a two-phase mechanism from the constant electrical potential found during cycling.

• OSTI ID: 345368
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 3 Vol. 146; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
CLATHRATES
CRYSTAL STRUCTURE
ELECTRODES
LITHIUM OXIDES
METAL-NONMETAL BATTERIES
TITANIUM OXIDES