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Issue 15, 2016
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Electrochemical lithiation/delithiation of SnP2O7 observed by in situ XRD and ex situ7Li/31P NMR, and 119Sn Mössbauer spectroscopy

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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 situ119Sn Mössbauer and ex situ7Li and 31P NMR spectroscopies with which we can follow the changes in the local environment of each element during cycling.

Graphical abstract: Electrochemical lithiation/delithiation of SnP2O7 observed by in situ XRD and ex situ7Li/31P NMR, and 119Sn Mössbauer spectroscopy

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Publication details

The article was received on 01 Mar 2016, accepted on 14 Mar 2016 and first published on 14 Mar 2016


Article type: Paper
DOI: 10.1039/C6CP01424K
Citation: Phys. Chem. Chem. Phys., 2016,18, 10375-10382
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    Electrochemical lithiation/delithiation of SnP2O7 observed by in situ XRD and ex situ7Li/31P NMR, and 119Sn Mössbauer spectroscopy

    I. Bezza, M. Kaus, L. Riekehr, L. Pfaffmann, S. Doyle, S. Indris, H. Ehrenberg, A. Solhy and I. Saadoune, Phys. Chem. Chem. Phys., 2016, 18, 10375
    DOI: 10.1039/C6CP01424K

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