Cross-Section Auger/XPS Imaging of Conversion Type Electrodes: How Their Morphological Evolution Controls the Performance in Li-Ion Batteries - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue ACS Applied Energy Materials Année : 2019

Cross-Section Auger/XPS Imaging of Conversion Type Electrodes: How Their Morphological Evolution Controls the Performance in Li-Ion Batteries

Résumé

Conversion type reactions have revolutionized the field of Li-ion batteries and beyond in terms of electrochemical performance and fundamental aspects. However, direct evidence of this reaction over long-term cycling still has to be demonstrated. Indeed, investigating the morphological conversion mechanism at both the electrode and nanometer scales remains very challenging. Here, the use of advanced Auger/μXPS imaging of electrode cross-sections, prepared by ion-milling, is proposed. Through the study of TiSnSb-based electrodes, the role of the inactive element (here Ti) in the long-term reversibility of the conversion reaction is highlighted. Importantly, Ti, Sn, and Sb are found together at the nanometer scale despite a total spreading over tens of microns which directly proves the electrochemical conversion of the TiSnSb material even after 400 cycles. Moreover, a gradual shell to core expansion/break-up of TiSnSb particles is revealed during the continuous conversion reactions and leads to highly porous structures after 400 cycles. This phenomenon, more uniform at 60 °C, is at the origin of the higher electrochemical performance at this temperature. Overall, the innovative approach proposed in this work will benefit the the study of not only conversion/alloy-based batteries but also all-solid-state batteries for which buried interfaces have to be reached.
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Dates et versions

hal-02289318 , version 1 (16-09-2019)

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Lénaïc Madec, Jean-Bernard Ledeuil, Gaël Coquil, Laure Monconduit, Hervé Martinez. Cross-Section Auger/XPS Imaging of Conversion Type Electrodes: How Their Morphological Evolution Controls the Performance in Li-Ion Batteries. ACS Applied Energy Materials, 2019, 2 (7), pp.5300-5307. ⟨10.1021/acsaem.9b01115⟩. ⟨hal-02289318⟩
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