{"id":2159,"date":"2008-08-02T16:44:50","date_gmt":"2008-08-02T16:44:50","guid":{"rendered":"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/2008\/08\/02\/les-quipes-bord\/"},"modified":"2012-07-12T10:51:07","modified_gmt":"2012-07-12T10:51:07","slug":"les-quipes-bord","status":"publish","type":"post","link":"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2008\/08\/02\/les-quipes-bord\/","title":{"rendered":"Des \u00e9quipes bordelaises (CNRS) et grenobloises (CEA) \u00e9tudient le fonctionnement \u00e9lectrochimique du phosphate de Fer lithi\u00e9."},"content":{"rendered":"<p><a href=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/toyotapluginhybrid13.jpg\"><img loading=\"lazy\" decoding=\"async\" height=\"169\" alt=\"Toyotapluginhybrid1\" src=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/toyotapluginhybrid11.jpg\" width=\"250\"  \/><\/a>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; <strong><span style=\"font-size: 1.4em\">L<\/span><\/strong>e phosphate de Fer lithi\u00e9, LiFePO4, qui a \u00e9t\u00e9 invent\u00e9 comme mat\u00e9riau d&rsquo;\u00e9lectrode positive d&rsquo;accumulateur&nbsp; par le Professeur John B.Goudenough de l&rsquo;Universit\u00e9 d&rsquo;Austin, Texas et membre de l&rsquo;Acad\u00e9mie des Sciences, fait l&rsquo;objet d&rsquo;intenses recherches fondamentales dans nos laboratoires du CNRS \u00e0 Bordeaux (Delmas, Maccario, Groguennec, Weill) et du CEA \u00e0 Grenoble (Le Cras). Ces \u00e9quipes ont \u00e9tudi\u00e9 et expliqu\u00e9 les m\u00e9canismes de transfert de charges qui impliquent \u00e0 la fois une bonne la conductivit\u00e9 ionique et \u00e9lectronique de ce mat\u00e9riau. Les m\u00e9canismes en se propageant tr\u00e8s rapidement, ont lieu \u00e0 l&rsquo;interface entre les deux phases voisines de LiFePO4 (forme r\u00e9duite) et de FePO4 (forme oxyd\u00e9e) qui ont th\u00e9oriquement de faibles conductivit\u00e9s ioniques et \u00e9lectroniques.<\/p>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;Ces travaux fondamentaux vont permettre aux chimistes industriels japonais, chinois et am\u00e9ricains qui travaillent sur l&rsquo;optimisation de ce mat\u00e9riau d&rsquo;avenir, de mieux comprendre les m\u00e9canismes de vieillissement, en particulier pour les batteries de type Lithium-Ion pour applications de type v\u00e9hicules \u00e9lectriques. A ce jour de nombreux nouveaux venus proposent des batteries comportant ce mat\u00e9riau (voir Lithium Iron Phosphate Battery sur Wikipedia) mais aucun des grands japonais des batteries n&rsquo;a pour l&rsquo;instant rien d\u00e9voil\u00e9 d&rsquo;important sur le sujet, ce qui laisse \u00e0 penser que le sujet est complexe.<\/p>\n<p>Le 2 Ao\u00fbt 2008.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; Le phosphate de Fer lithi\u00e9, LiFePO4, qui a \u00e9t\u00e9 invent\u00e9 comme mat\u00e9riau d&rsquo;\u00e9lectrode positive d&rsquo;accumulateur&nbsp; par le Professeur John B.Goudenough de l&rsquo;Universit\u00e9 d&rsquo;Austin, Texas et membre de l&rsquo;Acad\u00e9mie des Sciences, fait l&rsquo;objet d&rsquo;intenses recherches fondamentales dans nos laboratoires du CNRS \u00e0 Bordeaux (Delmas, Maccario, Groguennec, Weill) et [&hellip;]<\/p>\n","protected":false},"author":341,"featured_media":9722,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-2159","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - 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