Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 48, Pages 41732-41737Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b08926
Keywords
X-ray crystal truncation rod scattering; thin film; all-solid-state battery; solid-electrolyte/electrode interface; LiCoO2; Li3PO4; interface resistance
Funding
- Applied and Practical LiB Development for Automobile and Multiple Application project of the New Energy and Industrial Technology Development Organization (NEDO)
- Private University Research Branding Project from the Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Advanced Low Carbon Technology Research and Development Program (ALCA)
- PREST [JPMJPR13C5]
- CREST of the Japan Science and Technology Agency (JST)
- Toyota Motor Corporation
- MEXT, Japan [26105008, 25390072, 26106502, 26108702, 26246022, 26610092, 16H03864]
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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.
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