{"id":195218,"date":"2016-10-11T23:00:00","date_gmt":"2016-10-11T23:00:00","guid":{"rendered":"https:\/\/eenewseurope.artwhere.co\/batteries-miniatures-nomades-en-design-3d\/"},"modified":"2016-10-11T23:00:00","modified_gmt":"2016-10-11T23:00:00","slug":"batteries-miniatures-nomades-en-design-3d","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/batteries-miniatures-nomades-en-design-3d\/","title":{"rendered":"Batteries miniatures nomades en design 3D"},"content":{"rendered":"

Cette prouesse a \u00e9t\u00e9 r\u00e9alis\u00e9e en concevant une structure 3D \u00e0 base de micro-tubes. Il s’agit d’une premi\u00e8re \u00e9tape avant l’obtention d’une micro-batterie compl\u00e8te. Les premi\u00e8res exp\u00e9riences montrent l’excellente conductivit\u00e9 de l’\u00e9lectrolyte solide de la batterie, dont les performances, tr\u00e8s encourageantes, sont publi\u00e9es dans la revue Advanced Energy Materials du 11 octobre 2016.<\/p>\n

A l’heure des objets connect\u00e9s, les micro-capteurs intelligents et connect\u00e9s n\u00e9cessitent des sources d’\u00e9nergie embarqu\u00e9es miniatures de grande densit\u00e9 d’\u00e9nergie. Pour les micro-batteries extra-plates, dites planaires, augmenter cette densit\u00e9 d’\u00e9nergie passe par l’utilisation de couches de mat\u00e9riaux plus \u00e9paisses, ce qui pr\u00e9sente une limite \u00e9vidente. Une seconde voie, suivie par les auteurs de la publication, consiste \u00e0 usiner un wafer de silicium et fabriquer une structure 3D originale, \u00e0 base de micro-tubes simples ou doubles. La batterie 3D, conservant son empreinte surfacique de 1 mm2<\/sup>, d\u00e9veloppe ainsi une surface sp\u00e9cifique de 50 mm2<\/sup>, soit un gain de surface d’un facteur 50 !
\nRobustes, ces micro-tubes sont assez larges (de l’ordre du micron) pour \u00eatre enduits de plusieurs couches de mat\u00e9riaux actifs.<\/p>\n

Le principal d\u00e9fi technologique consistait justement \u00e0 d\u00e9poser les diff\u00e9rents mat\u00e9riaux composant la batterie, en couches fines et r\u00e9guli\u00e8res, sur ces structures 3D complexes. Gr\u00e2ce une technologie de pointe, le d\u00e9p\u00f4t par couche atomique ALD (Atomic Layer Deposition), les mat\u00e9riaux ont pu \u00e9pouser parfaitement les formes 3D du socle, sans boucher les structures tubulaires. Les chercheurs ont ainsi cr\u00e9\u00e9 une couche isolante, un collecteur de courant (en platine), une \u00e9lectrode n\u00e9gative et un \u00e9lectrolyte solide. Les diff\u00e9rentes analyses et caract\u00e9risations (nanotomographie par rayonnement X synchrotron et microscopie \u00e9lectronique \u00e0 transmission) montrent que les couches successives sont d’excellente qualit\u00e9, avec une conformit\u00e9 proche de 100 %. Les interfaces sont propres (pas d’inter-diffusion entre les diff\u00e9rents \u00e9l\u00e9ments chimiques) et aucun trou, fissure ou craquelure n’a \u00e9t\u00e9 d\u00e9tect\u00e9.<\/p>\n

\n

Le phosphate de lithium, l’\u00e9lectrolyte de cette future micro-batterie 3D, est sous forme solide. Apr\u00e8s l’avoir d\u00e9pos\u00e9 par la m\u00eame technologie ALD, les chercheurs ont montr\u00e9 qu’il combine une fen\u00eatre de stabilit\u00e9 \u00e9lectrochimique \u00e9lev\u00e9e (4,2 V), une haute conductivit\u00e9 ionique et une faible \u00e9paisseur (10 \u00e0 50 nm) g\u00e9n\u00e9rant une faible r\u00e9sistance surfacique : des \u00e9l\u00e9ments tr\u00e8s encourageants pour la performance de la batterie 3D \u00e0 venir.
\nLa prochaine \u00e9tape consistera \u00e0 mettre au point des films minces de mat\u00e9riaux d’\u00e9lectrode positive par ALD pour cr\u00e9er les premiers prototypes 3D fonctionnels et tr\u00e8s certainement bien plus performants que les micro-batteries planaires actuelles.<\/p>\n

Ces travaux brevet\u00e9s impliquent des chercheurs de l’Institut d’\u00e9lectronique, de micro\u00e9lectronique et de nanotechnologie (CNRS\/Universit\u00e9 de Lille\/Isen Lille\/Universit\u00e9 Valenciennes Hainaut-Cambresis\/Ecole centrale de Lille), de l’Unit\u00e9 de catalyse et de chimie du solide (CNRS\/Universit\u00e9 de Lille\/ ENSC Lille\/Ecole centrale de Lille\/Universit\u00e9 Artois), de l’Institut des mat\u00e9riaux de Nantes Jean Rouxel (CNRS\/Universit\u00e9 de Nantes), du Laboratoire r\u00e9activit\u00e9 et chimie des solides (CNRS\/Universit\u00e9 Picardie Jules Verne) et de l’Argonne national Lab aux Etats-Unis.
\nCette \u00e9tude a \u00e9t\u00e9 financ\u00e9e par l’ANR, la DGA, le r\u00e9seau Renatech, et le r\u00e9seau RS2E.<\/p>\n

www.cnrs.fr<\/a><\/p>\n

onlinelibrary.wiley.com\/doi\/10.1002\/aenm.201601402\/full<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Dans la course \u00e0 la miniaturisation, une \u00e9quipe franco-am\u00e9ricaine, impliquant principalement des chercheurs du CNRS, de l’universit\u00e9 de Lille et de l’universit\u00e9 de Nantes, au sein du r\u00e9seau RS2E (R\u00e9seau sur le stockage \u00e9lectrochimique de l’\u00e9nergie), a r\u00e9ussi \u00e0 am\u00e9liorer la densit\u00e9 d’\u00e9nergie d’une batterie sans en augmenter la taille, limit\u00e9e \u00e0 quelques millim\u00e8tres carr\u00e9s dans les capteurs nomades.<\/p>\n","protected":false},"author":9,"featured_media":195219,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[],"domains":[47],"ppma_author":[1141],"class_list":["post-195218","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","domains-electronique-eci"],"acf":[],"yoast_head":"Batteries miniatures nomades en design 3D ...<\/title>\n<meta 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densit\u00e9 d'\u00e9nergie d'une batterie sans en augmenter la taille, limit\u00e9e \u00e0 quelques millim\u00e8tres carr\u00e9s dans les capteurs nomades.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ecinews.fr\/fr\/wp-json\/wp\/v2\/posts\/195218\/\" \/>\n<meta property=\"og:site_name\" content=\"EENewsEurope\" \/>\n<meta property=\"article:published_time\" content=\"2016-10-11T23:00:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ecinews.fr\/wp-content\/uploads\/import\/default\/files\/sites\/default\/files\/images\/eci8114_squelette_micro_batterie_3d.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"358\" \/>\n\t<meta property=\"og:image:height\" content=\"209\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Alain Dieul\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" 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