Fabrication and High-temperature Electrochemical Stability of LiFePO<sub>4</sub> Cathode/Li<sub>3</sub>PO<sub>4</sub> Electrolyte Interface
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- KANG Dongho
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
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- ITO Kotaro
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
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- SHIMIZU Keisuke
- Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
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- WATANABE Kenta
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
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- MATSUI Naoki
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
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- SUZUKI Kota
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
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- KANNO Ryoji
- Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
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- HIRAYAMA Masaaki
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Research Center for All-Solid-State Battery, Institute of Innovation Research, Tokyo Institute of Technology
Abstract
<p>A thin-film battery composed of a LiFePO4 cathode/Li3PO4 electrolyte/Li anode was fabricated on a Pt/Ti/Si (PTS) substrate via RF magnetron sputtering. The amorphous Li3PO4 film was densely stacked on a 60 nm-thick LiFePO4 film, which provided a suitable reaction field for understanding the electrochemical properties of LiFePO4 at the interface with the solid electrolyte. The LiFePO4 cathode film exhibited highly reversible lithium desertion/insertion at the interface at room temperature and 60 °C, without any side reactions. An irreversible oxidation reaction occurred during the initial charging process at 100 °C, leading to an increase in the charge-transfer resistance of the LiFePO4/Li3PO4 interface with no significant decrease in the lithium desertion/insertion capacity of LiFePO4. This result suggests the formation of a resistive interphase via the decomposition of Li3PO4 at 100 °C. A severe decrease in capacity is observed at 125 °C, which indicates the LiFePO4-side interface contributed to the side reactions. The film battery exhibits a severe decrease in capacity at 125 °C.</p>
Journal
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- Electrochemistry
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Electrochemistry 92 (3), 037008-037008, 2024-03-28
The Electrochemical Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390862566409902976
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- ISSN
- 21862451
- 13443542
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
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- Abstract License Flag
- Allowed