Small magnetic polaron effect in lithium iron phosphates |
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| Authors: | A. Mauger K. Zaghib F. Gendron C. M. Julien |
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| Affiliation: | (1) Institut de Minéralogie et de Physique des Milieux Condensés, CNRS-UMR 7590, Université Pierre et Marie Curie, 140 rue de Lourmel, 75015 Paris, France;(2) Institut de Recherches d’Hydro-Québec, 1800 Boul. Lionel-Boulet, Varennes, Québec, Canada, J3X 1S1;(3) Institut des Nano-Sciences de Paris, CNRS-UMR 7588, Université Pierre et Marie Curie, 140 rue de Lourmel, 75015 Paris, France |
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| Abstract: | The small polarons in LiFePO4 are associated with the presence of Fe3+ ions introduced by the native defects in relative concentration ![$${{left[ {{text{Fe}}^{3 + } } right]} mathord{left/ {vphantom {{left[ {{text{Fe}}^{3 + } } right]} {left[ {{text{Fe}}^{2 + } + {text{Fe}}^{3 + } } right]}}} right. kern-nulldelimiterspace} {left[ {{text{Fe}}^{2 + } + {text{Fe}}^{3 + } } right]}} = 3 times 10^{ - 3} $$](/content/001n442wtj42k356/11581_2007_182_Article_IEq1.gif) in the samples known to be optimized with respect to their electrochemical properties. The nearest iron neighbours around the central polaron site are spin-polarized by the indirect exchange mediated by the electronic charge in excess. These small magnetic polarons are responsible for the interplay between electronic and magnetic properties that are quantitatively and self-consistently analysed. Comparison is made with other magnetic polaron effects in other members of the family of magnetic semiconductors to which this material belongs. Paper presented at the 11th Euro-Conference on Science and Technology of Ionics, Batz-sur-Mer, France, 9–15 September 2007. |
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| Keywords: | Cathodes Electronic conductivities Intercalation compounds Li-ion batteries |
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