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Noncrystalline Nanocomposites as a Remedy for the Low Diffusivity of Multivalent Ions in Battery Cathodes

Orikasa, Yuki and Kisu, Kazuaki and Iwama, Etsuro and Naoi, Wako and Yamaguchi, Yusuke and Yamaguchi, Yoshitomo and Okita, Naohisa and Ohara, Koji and Munesada, Toshiyuki and Hattori, Masashi and Yamamoto, Kentaro and Rozier, Patrick and Simon, Patrice and Naoi, Katsuhiko Noncrystalline Nanocomposites as a Remedy for the Low Diffusivity of Multivalent Ions in Battery Cathodes. (2020) Chemistry of Materials, 32 (3). 1011-1021. ISSN 0897-4756

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Official URL: https://doi.org/10.1021/acs.chemmater.9b03665


Rechargeable batteries using multivalent metals are among the most promising next-generation battery systems due to their high capacity, high safety, and low cost compared with lithium-ion batteries. However, strong cation−anion interaction degrades diffusion in solid cathodes, an effect that must be mitigated to yield practical multivalent metal batteries. We show that a highly defective iron phosphate−carbon composite prepared by ultracentrifugation serves as a reversible insertion/deinsertion for magnesium ions with, and operates beyond, a 2-V cell voltage at room temperature. A composite of noncrystalline particles that embeds the surrounding carbon structure enhances the magnesium-ion diffusion in the solid phase with stability for cycle life. X-ray absorption spectroscopy, transmission electron microscopy with energy-dispersive X-ray spectroscopy, and high-energy X-ray scattering measurements demonstrate magnesium-ion insertion and extraction in the defective iron phosphate without conversion reactions. This work suggests promising applications for highly defective structures as intercalation hosts for multivalent ions.

Item Type:Article
HAL Id:hal-03051539
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Japan Synchrotron Radiation Research Institute - JASRI (JAPAN)
Other partners > K & W Inc. (JAPAN)
Other partners > Tokyo University of Agriculture and Technology - TUAT (JAPAN)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Kyoto University (JAPAN)
Other partners > Ritsumeikan Asia Pacific University - APU (JAPAN)
Laboratory name:
Japan Society for the Promotion of Science
Deposited On:10 Dec 2020 10:14

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