title: Electrochemical lithiation/delithiation of SnP₂O₇ observed by in situ XRD and ex situ⁷Li/³¹P NMR, and ¹¹⁹Sn Mössbauer spectroscopy.
abstract: SnP2O7 was prepared by a sol-gel route. The structural changes of tin pyrophosphate during the electrochemical lithiation were followed by using in situ XRD measurements that reveal the existence of a crystalline phase at the beginning of the discharge process. Nevertheless, it becomes amorphous after the full discharge as a result of a conversion reaction leading to the formation of LixSny alloys. The electrochemical tests show a high capacity with high retention upon cycling. To better understand the reaction mechanism of SnP2O7 with Li, several techniques were applied, such as ex situ(119)Sn Mössbauer and ex situ(7)Li and (31)P NMR spectroscopies with which we can follow the changes in the local environment of each element during cycling.
authors.affiliation: LCME, FST Marrakech, University Cadi Ayyad, Av. A. Khattabi, BP 549, 40000 Marrakech, Morocco. i.saadoune@uca.ac.ma.
authors.forename: Ilham
authors.initials: I
authors.lastname: Bezza
authors.forename: Maximilian
authors.initials: M
authors.lastname: Kaus
authors.forename: Lars
authors.initials: L
authors.lastname: Riekehr
authors.forename: Lukas
authors.initials: L
authors.lastname: Pfaffmann
authors.forename: Stephen
authors.initials: S
authors.lastname: Doyle
authors.forename: Sylvio
authors.initials: S
authors.lastname: Indris
authors.forename: Helmut
authors.initials: H
authors.lastname: Ehrenberg
authors.forename: Abderrahim
authors.initials: A
authors.lastname: Solhy
authors.forename: Ismael
authors.initials: I
authors.lastname: Saadoune