Electrochemical property: Structure relationships in monoclinic Li(3-y)V2(PO4)3 |
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Authors: | Yin S-C Grondey H Strobel P Anne M Nazar L F |
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Affiliation: | Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1. |
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Abstract: | Monoclinic lithium vanadium phosphate, alpha-Li(3)V(2)(PO(4))(3), is a highly promising material proposed as a cathode for lithium-ion batteries. It possesses both good ion mobility and high lithium capacity because of its ability to reversibly extract all three lithium ions from the lattice. Here, using a combination of neutron diffraction and (7)Li MAS NMR studies, we are able to correlate the structural features in the series of single-phase materials Li(3-y)V(2)(PO(4))(3) with the electrochemical voltage-composition profile. A combination of charge ordering on the vanadium sites and lithium ordering/disordering among lattice sites is responsible for the features in the electrochemical curve, including the observed hysteresis. Importantly, this work highlights the importance of ion-ion interactions in determining phase transitions in these materials. |
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