{"id":4752,"date":"2025-10-27T14:28:13","date_gmt":"2025-10-27T06:28:13","guid":{"rendered":"https:\/\/www.powdergrindingmill.com\/?p=4752"},"modified":"2025-10-27T14:28:15","modified_gmt":"2025-10-27T06:28:15","slug":"from-niche-to-premium-the-renaissance-of-lithium-iron-phosphate-via-ferrous-oxalate-route-in-power-batteries","status":"publish","type":"post","link":"https:\/\/www.powdergrindingmill.com\/fr\/from-niche-to-premium-the-renaissance-of-lithium-iron-phosphate-via-ferrous-oxalate-route-in-power-batteries\/","title":{"rendered":"De niche \u00e0 premium : La renaissance du phosphate de fer et de lithium via la voie de l'oxalate de fer dans les batteries \u00e9lectriques"},"content":{"rendered":"
La voie de l\u2019oxalate de fer dans le d\u00e9veloppement des mat\u00e9riaux de cathode en phosphate de lithium et de fer (LFP) a effectivement connu un parcours dramatique, passant d\u2019\u00eatre remplac\u00e9e \u00e0 \u00eatre \u00e0 nouveau mise en avant. Autrefois la voie dominante dans l\u2019industrie, elle a \u00e9t\u00e9 marginalis\u00e9e en raison de ses propres d\u00e9fauts et de la concurrence de proc\u00e9d\u00e9s \u00e9mergents. Cependant, ces derni\u00e8res ann\u00e9es, elle a retrouv\u00e9 sa place sur le march\u00e9 des batteries haute performance en exploitant ses avantages uniques en termes de densit\u00e9 de compactage \u00e9lev\u00e9e et de performance en charge rapide.<\/p>\n\n\n\n
L'\u00e8re de la domination du proc\u00e9d\u00e9 \u00e0 l'oxalate de fer<\/strong><\/h2>\n\n\n\n
D\u00e8s 2017, la m\u00e9thode \u00e0 l'oxalate ferreux \u00e9tait encore le proc\u00e9d\u00e9 principal pour produire du phosphate de fer et de lithium. La voie de proc\u00e9d\u00e9 de base et l'\u00e9quation g\u00e9n\u00e9rale de r\u00e9action sont illustr\u00e9es \u00e0 la Figure 1. Selon les sources de lithium et de phosphore utilis\u00e9es, le proc\u00e9d\u00e9 implique deux m\u00e9canismes de r\u00e9action principaux (\u00e9quations 1 et 2), le processus initial suivant principalement l'\u00e9quation 1.<\/p>\n\n\n\nItin\u00e9raire de processus de base pour le phosphate de lithium et de fer via la m\u00e9thode de l'oxalate de fer<\/figcaption><\/figure>\n\n\n\n
Le processus de fabrication du phosphate de fer et de lithium utilisant de l'oxalate ferreux semble simple, mais la cl\u00e9 de la qualit\u00e9 du produit r\u00e9side dans les d\u00e9tails de chaque \u00e9tape.<\/p>\n\n\n\n
S\u00e9lection et contr\u00f4le des mati\u00e8res premi\u00e8res<\/strong><\/strong><\/h3>\n\n\n\n
La qualit\u00e9 de l'oxalate ferreux est le facteur central fondamental. La poudre d'oxalate ferreux de haute puret\u00e9 avec une taille de particule uniforme est pr\u00e9f\u00e9r\u00e9e. La taille initiale des particules de la mati\u00e8re premi\u00e8re d\u00e9termine directement la taille des particules du produit final. L'utilisation d'oxalate ferreux sph\u00e9rique ou quasi-sph\u00e9rique avec un D50 de 2-3 \u03bcm ou m\u00eame plus petit peut am\u00e9liorer consid\u00e9rablement la r\u00e9activit\u00e9 et produire un produit avec une densit\u00e9 de compactage \u00e9lev\u00e9e.<\/p>\n\n\n\n
Traditionnellement, le carbonate de lithium \u00e9tait couramment utilis\u00e9 comme source de lithium. Ces derni\u00e8res ann\u00e9es, le phosphate de dihydrog\u00e8ne de lithium a \u00e9t\u00e9 de plus en plus adopt\u00e9, car il fournit \u00e0 la fois les sources de lithium et de phosphore, rendant la r\u00e9action plus directe. Deuxi\u00e8mement, sa haute r\u00e9activit\u00e9 et sa faible temp\u00e9rature de d\u00e9composition contribuent \u00e0 r\u00e9duire la temp\u00e9rature de frittage et \u00e0 am\u00e9liorer la coh\u00e9rence du produit.<\/p>\n\n\n\n
Les sources de carbone sont s\u00e9lectionn\u00e9es en fonction de leur capacit\u00e9 \u00e0 former un r\u00e9seau de carbone conducteur fortement graphitis\u00e9 lors de la d\u00e9composition, comme le glucose, le saccharose et l'acide citrique.<\/p>\n\n\n\n
Contr\u00f4le du processus de calcination<\/strong><\/strong><\/h3>\n\n\n\n
Ce processus utilise g\u00e9n\u00e9ralement une m\u00e9thode de frittage en deux \u00e9tapes : la premi\u00e8re \u00e9tape consiste en un pr\u00e9-frittage \u00e0 basse temp\u00e9rature (~400\u00b0C) pour une d\u00e9composition suffisante des mati\u00e8res premi\u00e8res, et la deuxi\u00e8me \u00e9tape implique une cristallisation \u00e0 haute temp\u00e9rature (~600-750\u00b0C).<\/p>\n\n\n\n
L'\u00e9tape de pr\u00e9-sintering consiste principalement en la d\u00e9composition de l'oxalate ferreux et des phosphates : l'oxalate ferreux perd son eau de cristallisation et se d\u00e9compose en oxyde ferreux hautement r\u00e9actif (FeO), lib\u00e9rant de grandes quantit\u00e9s de CO et de CO\u2082. Le gaz r\u00e9ducteur CO forme un \u00ab bouclier protecteur \u00bb au sein du syst\u00e8me de r\u00e9action, emp\u00eachant efficacement l'oxydation de Fe\u00b2\u207a en Fe\u00b3\u207a tout en inhibant la croissance excessive des particules du produit final. Lorsqu'on utilise le phosphate diammonique comme source de phosphore, il se d\u00e9compose lors du pr\u00e9-sintering, lib\u00e9rant du gaz ammoniaque et de l'acide phosphorique.<\/p>\n\n\n\n
En contr\u00f4lant la temp\u00e9rature et la dur\u00e9e de pr\u00e9-sintering, les pr\u00e9curseurs de cristaux de phosphate de fer lithium peuvent \u00eatre form\u00e9s \u00e0 des temp\u00e9ratures relativement basses. Les gaz lib\u00e9r\u00e9s aident \u00e0 \u00e9liminer les impuret\u00e9s des mati\u00e8res premi\u00e8res tout en inhibant l'agglom\u00e9ration des particules et la croissance cristalline, facilitant la production de LFP avec une cristallinit\u00e9 \u00e9lev\u00e9e, une puret\u00e9 \u00e9lev\u00e9e et des particules uniformes lors de l'\u00e9tape de calcination \u00e0 haute temp\u00e9rature.<\/p>\n\n\n\n
Dans la zone de haute temp\u00e9rature, le FeO hautement r\u00e9actif entre en contact avec les sources de lithium et de phosphore, subissant une r\u00e9action \u00e0 l'\u00e9tat solide pour former des noyaux cristallins de LFP. Finalement, \u00e0 mesure que la temp\u00e9rature augmente et que la dur\u00e9e de maintien s'allonge, ces noyaux croissent progressivement, formant du Phosphate de Fer Lithium de type olivine avec une cristallinit\u00e9 compl\u00e8te et une structure stable.<\/p>\n\n\n\n
Lors du processus de frittage, la source de carbone organique subit une pyrolyse pour former un rev\u00eatement en carbone amorphe \u00e0 la surface des particules de LFP, am\u00e9liorant consid\u00e9rablement la conductivit\u00e9 \u00e9lectronique du mat\u00e9riau.<\/p>\n\n\n\n
Ce proc\u00e9d\u00e9 offrait des co\u00fbts faibles en source de fer, un flux de proc\u00e9d\u00e9 relativement simple, un investissement en \u00e9quipements, ainsi que des co\u00fbts d'exploitation et de maintenance, ce qui en faisait le proc\u00e9d\u00e9 dominant lors des premiers jours de la technologie de synth\u00e8se du LFP.<\/p>\n\n\n\n
Pourquoi la voie de l'oxalate de fer a-t-elle \u00e9t\u00e9 remplac\u00e9e ?<\/strong><\/h2>\n\n\n\n
Entre 2017 et 2022, l'industrie des batteries \u00e9lectriques a connu une croissance explosive. La demande en coh\u00e9rence des mat\u00e9riaux et en protection de l'environnement a soudainement augment\u00e9. Dans ce contexte, les faiblesses inh\u00e9rentes \u00e0 la m\u00e9thode en phase solide d'oxalate de fer (mauvaise coh\u00e9rence, difficult\u00e9 \u00e0 l'industrialisation) ont \u00e9t\u00e9 amplifi\u00e9es. La voie du phosphate de fer, avec sa coh\u00e9rence de produit exceptionnelle, son proc\u00e9d\u00e9 de fabrication plus respectueux de l'environnement et ses performances globales mieux adapt\u00e9es aux exigences des batteries \u00e9lectriques de l'\u00e9poque, est rapidement devenue la norme absolue du march\u00e9, atteignant \u00e0 son apog\u00e9e environ 70,1 % de parts de march\u00e9. En revanche, la part de la voie de l'oxalate de fer a progressivement diminu\u00e9 pour atteindre un chiffre \u00e0 un seul chiffre.<\/p>\n\n\n\n
De plus, la densit\u00e9 de compactage des produits LFP fabriqu\u00e9s par le processus pr\u00e9coce \u00e0 l'oxalate de fer n'\u00e9tait pas encore \u00e9lev\u00e9e, ce qui a conduit \u00e0 une perception r\u00e9pandue dans l'industrie durant cette p\u00e9riode selon laquelle les mat\u00e9riaux produits par la voie du phosphate de fer pouvaient plus facilement atteindre une densit\u00e9 de compactage plus \u00e9lev\u00e9e (\u22652,4 g\/cm\u00b3).<\/p>\n\n\n\n
Du point de vue de l\u2019\u00e9quipement et de l\u2019environnement, la m\u00e9thode \u00e0 l\u2019oxalate ferreux produit du CO et du gaz ammoniaque lors du frittage. Le CO est toxique et n\u00e9cessite un traitement. NH\u2083 est corrosif, endommageant gravement les fours et les canalisations, ce qui augmente les co\u00fbts de maintenance de l\u2019\u00e9quipement et les co\u00fbts li\u00e9s au temps. En revanche, les produits gazeux issus du processus de frittage \u00e0 la phosphate de fer sont principalement de la vapeur d\u2019eau, ce qui facilite le traitement des gaz r\u00e9siduaires, est plus respectueux de l\u2019\u00e9quipement de production, et entra\u00eene une pression environnementale plus faible.<\/p>\n\n\n\n
En r\u00e9sum\u00e9, le remplacement du processus lors de cette \u00e9tape \u00e9tait un cas typique de \u00ab demande industrielle stimulant l'it\u00e9ration de la voie technologique \u00bb, un r\u00e9sultat des dynamiques du march\u00e9 \u00e0 une phase sp\u00e9cifique de d\u00e9veloppement.<\/p>\n\n\n\n
La r\u00e9surgence de la voie de l'oxalate de ferreux<\/strong><\/h2>\n\n\n\n
Le retour de la voie de l'oxalate de ferreux n'est pas simplement une r\u00e9p\u00e9tition de l'ancien proc\u00e9d\u00e9 ; ses avantages fondamentaux ont \u00e9t\u00e9 r\u00e9activ\u00e9s sous de nouvelles exigences du march\u00e9 et des avanc\u00e9es technologiques. Apr\u00e8s 2022, la popularit\u00e9 des v\u00e9hicules \u00e0 \u00e9nergie nouvelle a augment\u00e9 de mani\u00e8re significative, et la \u00ab charge lente \u00bb est devenue un point douloureux central de l'exp\u00e9rience utilisateur. La demande du march\u00e9 pour des batteries capables de \u00ab charge ultra-rapide \u00bb (par exemple, une autonomie de 400 km en 10 minutes) a explos\u00e9.<\/p>\n\n\n\n
Bien que sa part de march\u00e9 ait \u00e9t\u00e9 autrefois comprim\u00e9e, la m\u00e9thode de l'oxalate de ferreux n'a pas \u00e9t\u00e9 compl\u00e8tement abandonn\u00e9e par le march\u00e9. En tant que pr\u00e9curseur des mat\u00e9riaux LFP, elle a \u00e9t\u00e9 la premi\u00e8re \u00e0 r\u00e9aliser des avanc\u00e9es dans la production de LFP \u00e0 haute densit\u00e9 de compactage. Les it\u00e9rations technologiques ont surmont\u00e9 les limitations initiales du proc\u00e9d\u00e9 d'oxalate de ferreux concernant la compaction du produit, la s\u00e9curit\u00e9 de la production et les co\u00fbts de production.<\/p>\n\n\n\n
Par exemple, Fulin Precision Industry a adopt\u00e9 des r\u00e9acteurs en serpentin + r\u00e9acteurs \u00e0 retardement chauff\u00e9s \u00e9lectriquement. Gr\u00e2ce \u00e0 un contr\u00f4le pr\u00e9cis de la temp\u00e9rature, \u00e0 l'ajout de dispersants et \u00e0 des processus automatis\u00e9s, ils ont consid\u00e9rablement am\u00e9lior\u00e9 la puret\u00e9 du produit (\u226599,5%) et l'uniformit\u00e9 de la taille des particules tout en r\u00e9duisant les co\u00fbts de 20%. Pengbo New Materials est \u00e9galement un leader dans la pr\u00e9paration domestique de la LFP via la m\u00e9thode de l'oxalate de ferreux. Gr\u00e2ce \u00e0 des contr\u00f4les sp\u00e9cifiques, ils parviennent \u00e0 un m\u00e9lange efficace de grandes et petites particules, comblant les lacunes entre les particules de LFP pour am\u00e9liorer la densit\u00e9 de compactage. Associ\u00e9 \u00e0 un dopage sp\u00e9cial en ions m\u00e9talliques, cela donne une LFP avec une r\u00e9sistivit\u00e9 en poudre tr\u00e8s faible. Lorsqu'il est appliqu\u00e9 dans les batteries de puissance, cela permet des taux plus \u00e9lev\u00e9s, r\u00e9pondant aux demandes croissantes de charge rapide des v\u00e9hicules \u00e0 \u00e9nergie nouvelle.<\/p>\n\n\n\n
Ainsi, pour que les processus de production de LFP restent invincibles face \u00e0 une concurrence f\u00e9roce, les entreprises concern\u00e9es doivent suivre de pr\u00e8s les tendances du march\u00e9, s'ancrer dans une innovation technologique continue, se baser sur un contr\u00f4le extr\u00eame des co\u00fbts, et utiliser la construction d'un \u00e9cosyst\u00e8me industriel robuste comme leur avantage concurrentiel.<\/p>","protected":false},"excerpt":{"rendered":"
La voie de l'oxalate de fer dans le d\u00e9veloppement des mat\u00e9riaux cathodiques au phosphate de lithium et de fer (LFP) a en effet connu un parcours dramatique, \u00e9tant remplac\u00e9e puis [\u2026]<\/p>","protected":false},"author":1,"featured_media":4753,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[59,60],"tags":[],"class_list":["post-4752","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-battery-materials","category-lithium-iron-phosphate"],"yoast_head":"\n
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