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Characterization and Quantification of Depletion and Accumulation Layers in Solid‐State Li + ‐Conducting Electrolytes Using In Situ Spectroscopic Ellipsometry
Author(s) -
Katzenmeier Leon,
Carstensen Leif,
Schaper Simon J.,
MüllerBuschbaum Peter,
Bandarenka Aliaksandr S.
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100585
Subject(s) - materials science , electrolyte , anode , ellipsometry , characterization (materials science) , electrochemical window , ionic conductivity , conductivity , cathode , lithium (medication) , fast ion conductor , electrochemistry , nanotechnology , ceramic , chemical engineering , optoelectronics , electrode , thin film , composite material , electrical engineering , chemistry , medicine , engineering , endocrinology
The future of mobility depends on the development of next‐generation battery technologies, such as all‐solid‐state batteries. As the ionic conductivity of solid Li + ‐conductors can, in some cases, approach that of liquid electrolytes, a significant remaining barrier faced by solid‐state electrolytes (SSEs) is the interface formed at the anode and cathode materials, with chemical instability and physical resistances arising. The physical properties of space charge layers (SCLs), a widely discussed phenomenon in SSEs, are still unclear. In this work, spectroscopic ellipsometry is used to characterize the accumulation and depletion layers. An optical model is developed to quantify their thicknesses and corresponding concentration changes. It is shown that the Li + ‐depleted layer (≈190 nm at 1 V) is thinner than the accumulation layer (≈320 nm at 1 V) in a glassy lithium‐ion‐conducting glass ceramic electrolyte (a trademark of Ohara Corporation). The in situ approach combining electrochemistry and optics resolves the ambiguities around SCL formation. It opens up a wide field of optical measurements on SSEs, allowing various experimental studies in the future.