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Coquil, G., Fraisse, B., Dupre, N. & Monconduit, L. (2018) Versatile Si/P System as Efficient Anode for Lithium and Sodium Batteries: Understanding of an Original Electrochemical Mechanism by a Full XRD-NMR Study. Acs Applied Energy Materials, 1 3778–3789.
Added by: Richard Baschera (2019-03-26 10:30:15) Last edited by: Richard Baschera (2019-03-26 10:34:38) |
| Type de référence: Article DOI: 10.1021/acsaem.8b00567 Clé BibTeX: Coquil2018 Voir tous les détails bibliographiques  |
Catégories: ST2E Créateurs: Coquil, Dupre, Fraisse, Monconduit Collection: Acs Applied Energy Materials |
Consultations : 1/862
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| Résumé |
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As illustrated by recent extensive crystallographic studies, the structural richness of the ternary Li/Si/P system offers a unique variety of physical properties. Taking advantage of 3D networks enabling fast ionic conduction properties, new phosphorus silicides based electrodes have recently emerged, exhibiting attractive performance in Li-ion as well as in Na-ion batteries. To date, SiP2 reaction mechanism vs Li or Na has nevertheless not been elucidated. The combination of operando X-ray diffraction and ex situ P-31, Li-7, Na-23, and F-19 MAS NMR spectroscopy allows here probing of both long-range structural information and evolution of local environments. These complementary techniques lead to deeper understanding and depiction of the mechanism behind the lithiation/delithiation and sodiation/desodiation of SiP2. The versatility of connection of tetrahedral SiP4 anions, from threedimensional network to isolated SiP4 units, stabilized by an increasing number of counterions as a function of the state of charge/discharge is the driving force of the new SiP2/Li and SiP2/Na batteries. This richness of SiP4 anions' crystallographic network allows stepwise phase transitions during lithiation/delithiation which limit the detrimental effects of volume expansion.
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