Probing the Interface Evolution in Co-sintered All-Phosphate Cathode-Solid Electrolyte Composites
To achieve cohesive interfaces of solid components in next-generation Li-ion batteries (LIBs) composed of oxide cathodes and solid electrolytes (SEs) high-temperature sintering is necessary which leads to material degradation and phase decompositions. Thermochemically compatible components can a...
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Autoren: | , , , , , , , |
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פורמט: | Artikel |
שפה: | אנגלית |
יצא לאור: |
Philipps-Universität Marburg
2023
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נושאים: | |
גישה מקוונת: | PDF-Volltext |
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סיכום: | To achieve cohesive interfaces of solid components in next-generation Li-ion
batteries (LIBs) composed of oxide cathodes and solid electrolytes (SEs)
high-temperature sintering is necessary which leads to material degradation
and phase decompositions. Thermochemically compatible components can
address these issues. In this work, advanced electron microscopy techniques
are employed to investigate the structural and chemical evolution taking place
at the interfaces between a LiFePO4 (LFP) cathode and an in-house optimized
Li1.3Al0.3Ti1.7(PO4)3 (LATP) SE co-sintered between 650 °C – 850 °C. While the
LFP particles exhibit excellent structural stability, the LATP particles phase
transforms at elevated temperatures. At 650 °C, FeLi anti-site defect is
observed at the LFP grain boundaries. Between 750 and 850 °C, the LATP
(R-3c) transforms into two orthorhombic phases (Pbca and Pbcn) of the type
Li1.3+xAl0.3FexTi1.7-x(PO4)3 depending on Fe substitution while forming the
cohesive interfaces. The discharge capacity of the composite decreases from
148 mAh g−1 at 650 °C to 130 mAh g-1 at 850 °C confirming that the new
phases are still electrochemically active. This study provides a spatially
resolved insight into the formation of cohesive interfaces highlighting the
advantage of employing components with similar anionic structures for
further improvements in LIBs. |
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תאור פריט: | Gefördert durch den Open-Access-Publikationsfonds der UB Marburg. |
DOI: | 10.1002/admi.202300513 |