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Eu3+/Eu2+ redox energy in a new lithium intercalation compound LixEuTa7O19 (0 <= x <= 1)
- Authors
- Song, Sang-Hoon
- Issue Date
- 4월-2021
- Publisher
- SPRINGER
- Keywords
- Internal electric field; Europium tantalate; Li-insertion potentials; Internal capacitance
- Citation
- JOURNAL OF SOLID STATE ELECTROCHEMISTRY, v.25, no.4, pp.1433 - 1439
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF SOLID STATE ELECTROCHEMISTRY
- Volume
- 25
- Number
- 4
- Start Page
- 1433
- End Page
- 1439
- ISSN
- 1432-8488
- Abstract
- Electrochemical lithium intercalation is observed in LixEuTa7O19 with 0 <= x <= 1; the voltage profiles show a 4f(6)/4f(7) Eu3+/Eu2+ redox plateau at 1.85 V versus Li+/Li-0. The shift of 1 V in the Eu3+/Eu2+ redox plateau relative to that found in the layered perovskite LiEuTiO4 (0.85 V versus Li+/Li-0) can be attributed to a capacitance energy stored in the three parallel planes (Eu2O2)(2+)-(TiO2)(0)-(Li2O2)(2-) in LiEuTiO4. Optical measurements show that the energy gaps between the Eu: 4f(6) and O:2p(6) band edges for LiEuTiO4 and EuTa7O19 are 3.86 and 3.94 eV, respectively.
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