Electrochemical lithiation/delithiation of SnP2O7 observed by in situ XRD and ex situ7Li/31P NMR, and 119Sn Mössbauer spectroscopy
Literature Information
Lukas Pfaffmann, Stephen Doyle, Sylvio Indris, Abderrahim Solhy
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.
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