{"id":133598,"date":"2018-01-11T09:52:03","date_gmt":"2018-01-11T09:52:03","guid":{"rendered":"https:\/\/\/eau-sel-batterie-low-cost\/"},"modified":"2018-01-11T09:52:03","modified_gmt":"2018-01-11T09:52:03","slug":"eau-sel-batterie-low-cost","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/eau-sel-batterie-low-cost\/","title":{"rendered":"Eau + Sel = Batterie low cost ?"},"content":{"rendered":"<p><span lang=\"fr\"><span title=\"Looking for safe, affordable batteries for the future, the question is: Why don't we just use water as electrolyte?\">\u00c0 la recherche de batteries s\u00fbres et abordables pour l&rsquo;avenir, la question est: pourquoi n&rsquo;utilisons-nous pas simplement l&rsquo;eau comme \u00e9lectrolyte? <\/span><span title=\"Water is inexpensive, available everywhere, does not burn and can conduct ions.\">L&rsquo;eau est peu co\u00fbteuse, disponible partout, ne br\u00fble pas et peut conduire des ions. <\/span><span title=\"However, water has a decisive disadvantage: it is chemically stable only up to a voltage difference of 1.23 V. A water cell therefore supplies three times less voltage than a standard lithium-ion cell with 3.7 volts, which is why it would hardly be suitable\">Cependant, l&rsquo;eau pr\u00e9sente un inconv\u00e9nient d\u00e9cisif: elle n&rsquo;est chimiquement stable que jusqu&rsquo;\u00e0 une diff\u00e9rence de tension de 1,23 V. Une pile \u00e0 eau fournit donc trois fois moins de tension qu&rsquo;une pile lithium-ion standard de 3,7 volts, raison pour laquelle elle ne conviendrait pas <\/span><span title=\"for applications in an electric car.\">pour des applications dans une voiture \u00e9lectrique. <\/span><span title=\"For stationary power storage applications, however, a cost-effective water-based battery could become interesting.\">Cependant, pour les applications de stockage d&rsquo;\u00e9nergie stationnaires une batterie low-cost \u00e0 base d&rsquo;eau pourrait devenir int\u00e9ressante. <\/span><span title=\"Ruben-Simon K\u00fchnel and David Reber, researchers in Empa's Materials for Energy Conversion department, have now discovered a way to solve the problem: The salt containing electrolyte has to be liquid, but at the same time it has to be so highly concentrated that it\">Ruben-Simon K\u00fchnel et David Reber, chercheurs du d\u00e9partement Mat\u00e9riaux pour la conversion d&rsquo;\u00e9nergie de l&rsquo;Empa, ont d\u00e9couvert un moyen de r\u00e9soudre le probl\u00e8me: l&rsquo;\u00e9lectrolyte contenant le sel doit \u00eatre liquide, mais en m\u00eame temps il doit \u00eatre tellement concentr\u00e9 qu&rsquo;il <\/span><span title=\"does not contain any &quot;excess&quot; water.\">ne contienne pas d&rsquo;eau \u00ab\u00a0en exc\u00e8s\u00a0\u00bb.&nbsp;<\/span><\/span> <span id=\"result_box\" lang=\"fr\"><span title=\"For their experiments, the two researchers used sodium FSI (exact name: sodium bis (fluorosulfonyl)imide).\">Pour leurs exp\u00e9riences, les deux chercheurs ont utilis\u00e9 le sodium FSI (nom exact: sodium bis (fluorosulfonyl) imide). <\/span><span title=\"This salt is extremely soluble in water: seven grams of sodium FSI and one gram of water form a clear salt solution (see video clip).\">Ce sel est extr\u00eamement soluble dans l&rsquo;eau: sept grammes de FSI de sodium et un gramme d&rsquo;eau forment une solution saline claire (<a href=\"https:\/\/youtu.be\/tT9sQzQ84rI\">voir le clip vid\u00e9o<\/a>). <\/span><span title=\"In this liquid, all water molecules are grouped around the positively charged sodium cations in a hydrate shell, hardly any unbound water molecules are present.\n\n\">Dans ce liquide, toutes les mol\u00e9cules d&rsquo;eau sont group\u00e9es autour des cations de sodium charg\u00e9s positivement <\/span><\/span><span lang=\"fr\"><span title=\"In this liquid, all water molecules are grouped around the positively charged sodium cations in a hydrate shell, hardly any unbound water molecules are present.\n\n\">dans une enveloppe d&rsquo;hydrate et pratiquement aucune mol\u00e9cule d&rsquo;eau non li\u00e9e n&rsquo;est pr\u00e9sente.<\/span><\/span><\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p><span id=\"result_box\" lang=\"fr\"><span title=\"The researchers found out that this salt solution has an electrochemical stability of up to 2.6 volts - almost twice as much as other aqueous electrolytes.\">Les chercheurs ont d\u00e9couvert que cette solution saline a une stabilit\u00e9 \u00e9lectrochimique allant jusqu&rsquo;\u00e0 2,6 volts &#8211; presque deux fois plus que les autres \u00e9lectrolytes aqueux. <\/span><span title=\"The discovery could be the key to affordable and safe battery cells.\">La d\u00e9couverte pourrait \u00eatre la cl\u00e9 pour des cellules de batterie bon-march\u00e9 et s\u00fbres. <\/span><span title=\"Inexpensive also because the sodium FSI cells were safer and easier to build than the well-known Li-Ion batteries.\">Low-cost&nbsp; \u00e9galement parce que les piles au sodium FSI sont plus s\u00fbres et plus faciles \u00e0 construire que les batteries Li-Ion bien connues. <\/span><span title=\"The system has already withstood a series of loading and unloading cycles successfully in the laboratory.\">Le syst\u00e8me a d\u00e9j\u00e0 pass\u00e9 avec succ\u00e8s une s\u00e9rie de cycles de chargement et de d\u00e9chargement au laboratoire. <\/span><span title=\"Until now, however, the researchers have tested the anodes and cathodes of their test battery separately - against a standard electrode as a partner.\">Jusqu&rsquo;\u00e0 pr\u00e9sent, cependant, les chercheurs ont test\u00e9 les anodes et les cathodes de leur batterie d&rsquo;essai s\u00e9par\u00e9ment &#8211; contre une \u00e9lectrode standard en tant que partenaire. <\/span><span title=\"In a next step, the two half cells are to be combined into a single battery.\">Dans une \u00e9tape suivante, les deux demi-cellules doivent \u00eatre combin\u00e9es en une seule batterie. <\/span><span title=\"Then further charging and discharging cycles are planned.\">Ensuite, d&rsquo;autres cycles de chargement et de d\u00e9chargement sont pr\u00e9vus. <\/span><span title=\"Empa's research activities on new types of batteries for stationary power storage systems are embedded in the Swiss Competence Center for Heat and Electricity Storage (SCCER HaE), which coordinates research for new heat and power storage concepts at national level and is managed by the Paul Scherrer\">Les activit\u00e9s de recherche de l&rsquo;Empa sur les nouveaux types de batteries pour les syst\u00e8mes de stockage stationnaires sont int\u00e9gr\u00e9es dans le Centre suisse de comp\u00e9tences en stockage de chaleur et d&rsquo;\u00e9lectricit\u00e9 (SCCER HaE), qui coordonne la recherche de nouveaux concepts de stockage de chaleur et d&rsquo;\u00e9lectricit\u00e9 au niveau national et sont g\u00e9r\u00e9es par l&rsquo; <\/span><span title=\"Institute.\">Institut <\/span><\/span>Paul Scherrer<span lang=\"fr\"><span title=\"Institute.\">. <\/span><span title=\"If the experiment succeeds, the inexpensive water battery is within reach.\">Si l&rsquo;exp\u00e9rience r\u00e9ussit, la batterie \u00e0 eau bon-march\u00e9 sera \u00e0 port\u00e9e de main.<\/span><\/span><\/p>\n<p>Pour plus d&rsquo;information (en anglais): <a href=\"https:\/\/www.empa.ch\/web\/s604\/salt-water-battery\">https:\/\/www.empa.ch\/web\/s604\/salt-water-battery<\/a><\/p>\n<p><strong>La r\u00e9daction vous conseille:<\/strong><\/p>\n<p><a href=\"http:\/\/www.electronique-eci.com\/news\/une-start-pour-des-batteries-se-rechargeant-de-plus-en-plus-vite\">Une start-up pour des batteries se rechargeant de plus en plus vite<\/a><\/p>\n<p><a href=\"http:\/\/www.electronique-eci.com\/news\/les-batteries-magnesium-une-alternative-au-lithium\">Les batteries magn\u00e9sium, une alternative au lithium<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;eau pourrait bient\u00f4t servir de base pour des batteries rechargeables bon march\u00e9. Les scientifiques de l&rsquo;institut suisse de recherche sur les mat\u00e9riaux EMPA ont r\u00e9ussi \u00e0 doubler la stabilit\u00e9 \u00e9lectrochimique de l&rsquo;eau avec une solution saline sp\u00e9ciale. C&rsquo;est un grand pas vers l&rsquo;utilisation \u00e9conomique de la technologie.<\/p>\n","protected":false},"author":22,"featured_media":133599,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[909],"domains":[47],"ppma_author":[1149],"class_list":["post-133598","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-batteries-power-supplies-fr","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Eau + Sel = Batterie low cost ? ...<\/title>\n<meta name=\"description\" content=\"L&#039;eau pourrait bient\u00f4t servir de base pour des batteries rechargeables bon march\u00e9. 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