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

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-03051539
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Submitted on : Thursday, December 10, 2020 - 11:14:22 AM
Last modification on : Tuesday, May 4, 2021 - 3:40:02 PM
Long-term archiving on: : Thursday, March 11, 2021 - 7:11:21 PM

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Yuki Orikasa, Kazuaki Kisu, Etsuro Iwama, Wako Naoi, Yusuke Yamaguchi, et al.. Noncrystalline Nanocomposites as a Remedy for the Low Diffusivity of Multivalent Ions in Battery Cathodes. Chemistry of Materials, American Chemical Society, 2020, 32 (3), pp.1011-1021. ⟨10.1021/acs.chemmater.9b03665⟩. ⟨hal-03051539⟩

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