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Influence of Cation Substitution on Cycling Stability and Fe-Cation Migration in LiFeMTeO (M = Al, In) Cathode Materials. | LitMetric
LiFeTeO adopts a crystal structure, described in space group , related to that of LiSbO, in which Te, Fe, and Li cations reside in a partially ordered configuration within an hcp array of oxide ions. Chemical or electrochemical insertion of lithium is accompanied by a fully reversible migration of some of the Fe cations with an initial capacity of 120 mA h g (2.85 Li per formula unit). Long-term cycling stability is limited by the facile reduction of Te to elemental Te, which leads to cathode decomposition. Partial substitution of Fe by In suppresses Te reduction, such that LiFeInTeO shows no sign of this cathode decomposition pathway, even after 100 cycles. In contrast, Al-for-Fe substitution is chemically limited to LiFeAlTeO and appears to have almost no influence on cathode longevity. These features of the LiFeMTeO system are discussed on the basis of a detailed structural analysis performed using neutron and synchrotron X-ray diffraction.
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