{"id":18918,"date":"2024-09-03T09:27:47","date_gmt":"2024-09-03T01:27:47","guid":{"rendered":"https:\/\/battery9999.com\/fr\/?p=18918"},"modified":"2024-09-03T09:27:47","modified_gmt":"2024-09-03T01:27:47","slug":"degradation-des-batteries-lfp-ce-que-les-marques-ne-nous-disent-pas","status":"publish","type":"post","link":"https:\/\/battery9999.com\/fr\/degradation-des-batteries-lfp-ce-que-les-marques-ne-nous-disent-pas\/","title":{"rendered":"D\u00e9gradation des batteries LFP, ce que les marques ne nous disent pas"},"content":{"rendered":"

Publi\u00e9 le 26 ao\u00fbt 2024<\/p>\n

\"\"<\/p>\n

LFP vs NMC, la guerre des co\u00fbts<\/h2>\n

Les fabricants de v\u00e9hicules \u00e9lectriques se tournent de plus en plus vers les batteries LFP (lithium-fer-phosphate), abandonnant progressivement les batteries NCM (nickel-cobalt-mangan\u00e8se) qui \u00e9taient les plus r\u00e9pandues ces derni\u00e8res ann\u00e9es.<\/p>\n

Bien que les batteries LFP offrent une densit\u00e9 \u00e9nerg\u00e9tique inf\u00e9rieure et donc moins d’autonomie, elles pr\u00e9sentent des avantages significatifs qui s\u00e9duisent l’industrie.<\/p>\n

Ces batteries sont moins co\u00fbteuses \u00e0 produire, ce qui se traduit par des prix plus comp\u00e9titifs pour les consommateurs. Elles sont \u00e9galement plus s\u00fbres, avec un risque d’incendie r\u00e9duit, et elles offrent une plus grande long\u00e9vit\u00e9.<\/p>\n

\n

Contrairement aux batteries NCM, les constructeurs recommandent que les batteries LFP soient charg\u00e9es compl\u00e8tement de mani\u00e8re p\u00e9riodique, au moins une fois par semaine, comme le conseille Tesla par exemple pour ses mod\u00e8les d’entr\u00e9e de gamme, le Model 3 et le Model Y.<\/p>\n<\/div>\n

\n

Cette recommandation repose sur l’id\u00e9e que charger r\u00e9guli\u00e8rement la batterie \u00e0 100% pr\u00e9serve sa sant\u00e9, \u00e9vite une diminution des performances et aide \u00e0 la calibration du pack, assurant ainsi une lecture plus pr\u00e9cise de l’autonomie restante par le v\u00e9hicule.<\/p>\n

En revanche, pour les batteries NCM, il est g\u00e9n\u00e9ralement conseill\u00e9 de limiter la charge \u00e0 80-90%, car une charge plus \u00e9lev\u00e9e augmente la temp\u00e9rature et le voltage, acc\u00e9l\u00e9rant ainsi la d\u00e9gradation de la batterie.<\/p>\n

\"LaLa Citro\u00ebn \u00eb-C3 sera \u00e9quip\u00e9 de batterie LFP \u00a9Arnaud Lescure<\/span><\/div>\n
\n

L’\u00e9tude qui remet en cause l’usage des batteries LFP<\/h2>\n

Un r\u00e9cent article publi\u00e9 dans le “Journal of Electrochemical Society”, co\u00e9crit par le Dr. Jeff Dahn, directeur d’un laboratoire de recherche financ\u00e9 par Tesla, remet en question ces pratiques courantes. Ce laboratoire, qui a aid\u00e9 Tesla dans le d\u00e9veloppement de ses batteries NCM, pr\u00e9sente des conclusions surprenantes sur les batteries LFP.<\/p>\n

Selon l’\u00e9tude, plus une batterie LFP est soumise \u00e0 des cycles de charge r\u00e9p\u00e9t\u00e9s \u00e0 un \u00e9tat de charge \u00e9lev\u00e9, plus ses cellules peuvent \u00eatre endommag\u00e9es avec le temps. Pourquoi ? Ce type de batterie, lorsqu’elle est compl\u00e8tement charg\u00e9e, g\u00e9n\u00e8re des compos\u00e9s nuisibles (alcoylures de lithium) en raison du voltage et de la chaleur qui s’accumulent sur l’\u00e9lectrode n\u00e9gative, provoquant ainsi une d\u00e9gradation.<\/p>\n

\n

“Les cycles proches de la limite sup\u00e9rieure de charge (75-100%) sont pr\u00e9judiciables pour les cellules LFP\/grafite. Nos r\u00e9sultats montrent une corr\u00e9lation entre le SoC (\u00e9tat de charge) moyen de la batterie et la perte de capacit\u00e9 de charge, ce qui signifie que plus le SoC moyen est faible, plus la dur\u00e9e de vie sera longue. Il est donc essentiel de minimiser le temps pass\u00e9 \u00e0 des niveaux de charge \u00e9lev\u00e9s<\/em>“, explique l’\u00e9tude.<\/p>\n<\/blockquote>\n

Une recommendation peu applicable<\/h2>\n

Cette \u00e9tude montre que pour maximiser la dur\u00e9e de vie des cellules LFP\/graphite, il est recommand\u00e9 de les utiliser dans des plages de charge plus faibles, tout en \u00e9vitant les charges \u00e9lev\u00e9s aussi souvent que possible. Toutefois, ces recommandations ne sont pas sans cons\u00e9quence sur l’usage et paraissent peu applicables dans la vie de tous les jours.<\/p>\n

L’\u00e9tude r\u00e9v\u00e8le en effet que les cellules cycl\u00e9es dans des fen\u00eatres de charge plus faibles (0%\u201325% et 0%\u201360%) ont conserv\u00e9 une capacit\u00e9 plus \u00e9lev\u00e9e sur une p\u00e9riode prolong\u00e9e, ce qui sugg\u00e8re que l’utilisation de ces fen\u00eatres pourrait prolonger la dur\u00e9e de vie des cellules dans des applications pratiques.<\/p>\n

L’angoisse de l’autonomie \u00e9tant une des pr\u00e9occupations majeures des conducteurs de voitures \u00e9lectriques, rouler avec un \u00e9tat de charge n\u2019exc\u00e9dant pas le quart de la batterie risque d refroidir encore ceux qui s’interrogent sur la commodit\u00e9 d’usage de l’\u00e9lectrique.<\/p>\n

La source:D\u00e9gradation des batteries LFP, ce que les marques ne nous disent pas – Mobilit\u00e9 Verte (mobilite-verte.com)<\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Publi\u00e9 le 26 ao\u00fbt 2024<\/p>\n","protected":false},"author":12,"featured_media":18919,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[795],"tags":[],"class_list":["post-18918","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites-industrielles"],"yoast_head":"\nD\u00e9gradation des batteries LFP, ce que les marques ne nous disent pas - \u660c\u8467\u80a1\u4efd\u6709\u9650\u516c\u53f8<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/battery9999.com\/fr\/degradation-des-batteries-lfp-ce-que-les-marques-ne-nous-disent-pas\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"D\u00e9gradation des batteries LFP, ce que les marques ne nous disent pas - 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