Atomically Well-Ordered Structure at Solid Electrolyte and Electrode Interface Reduces the Interfacial Resistance

Using synchrotron surface X-ray diffraction, we investigated the atomic structures of the interfaces of a solid electrolyte (Li3PO4) and electrode (LiCoO2). We prepared two types of interfaces with high and low interface resistances; the low-resistance interface exhibited a flat and well-ordered ato...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2018-12, Vol.10 (48), p.41732-41737
Main Authors: Shiraki, Susumu, Shirasawa, Tetsuroh, Suzuki, Tohru, Kawasoko, Hideyuki, Shimizu, Ryota, Hitosugi, Taro
Format: Article
Language:English
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Summary:Using synchrotron surface X-ray diffraction, we investigated the atomic structures of the interfaces of a solid electrolyte (Li3PO4) and electrode (LiCoO2). We prepared two types of interfaces with high and low interface resistances; the low-resistance interface exhibited a flat and well-ordered atomic arrangement at the electrode surface, whereas the high-resistance interface showed a disordered interface. These results indicate that the crystallinity of LiCoO2 at the interface has a significant impact on interface resistance. Furthermore, we reveal that the migration of Li ions along the interface and into grain boundaries and antiphase domain boundaries is a critical factor reducing interface resistance.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.8b08926