{"id":15836,"date":"2024-10-16T01:53:32","date_gmt":"2024-10-16T01:53:32","guid":{"rendered":"http:\/\/quartz-grinding.com\/?p=15836"},"modified":"2024-10-18T05:03:56","modified_gmt":"2024-10-18T05:03:56","slug":"silicon-after-grinding-by-mill-can-be-used-in-negative-electrode","status":"publish","type":"post","link":"https:\/\/www.quartz-grinding.com\/fr\/silicon-after-grinding-by-mill-can-be-used-in-negative-electrode\/","title":{"rendered":"Le silicium trait\u00e9 par broyage peut \u00eatre utilis\u00e9 dans une \u00e9lectrode n\u00e9gative"},"content":{"rendered":"<p>Avec le d\u00e9veloppement rapide de la technologie des batteries, <a href=\"http:\/\/quartz-grinding.com\/products-category\/ball-mill-and-air-classifier-production-line\/\">silicium<\/a> devient progressivement un mat\u00e9riau d&#039;\u00e9lectrode n\u00e9gative potentielle. D\u00e8s les ann\u00e9es 1970, on a d\u00e9couvert la r\u00e9action \u00e9lectrochimique entre<a href=\"https:\/\/www.google.com\/search?q=lithium+(Li)&amp;oq=lithium+(Li)&amp;aqs=chrome..69i57.18997j0j15&amp;sourceid=chrome&amp;ie=UTF-8\"> lithium (Li)<\/a> et le silicium \u00e9l\u00e9mentaire (Si). Gr\u00e2ce au traitement par broyeur, par exemple : broyeur \u00e0 boulets, le silicium peut \u00eatre bien utilis\u00e9 dans l&#039;\u00e9lectrode n\u00e9gative de la batterie. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"553\" height=\"373\" src=\"http:\/\/quartz-grinding.com\/wp-content\/uploads\/2024\/10\/silicon-in-battery.png\" alt=\"\" class=\"wp-image-15837\" srcset=\"https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/silicon-in-battery.png 553w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/silicon-in-battery-300x202.png 300w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/silicon-in-battery-18x12.png 18w\" sizes=\"(max-width: 553px) 100vw, 553px\" \/><\/figure>\n\n\n\n<p>Le potentiel de r\u00e9action de l&#039;alliage lithium-silicium (LixSi, 0 &lt; x \u2264 4,4) diminue avec l&#039;augmentation du degr\u00e9 de lithiation. En raison de ses excellentes propri\u00e9t\u00e9s, le silicium a attir\u00e9 une attention consid\u00e9rable du monde universitaire et de l&#039;industrie en tant que prochaine g\u00e9n\u00e9ration de mat\u00e9riaux d&#039;\u00e9lectrode n\u00e9gative. Cependant, nous ne pouvons pas utiliser directement du silicium pur ou du silicium \u00e0 haute teneur comme \u00e9lectrode n\u00e9gative de batterie. Pourquoi ? Analysons-le ci-dessous :<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Raisons pour lesquelles le silicium pur ou le silicium de haute puret\u00e9 ne peut pas \u00eatre utilis\u00e9 comme \u00e9lectrode n\u00e9gative<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>&nbsp;1. Le probl\u00e8me de l&#039;expansion du volume<\/strong><\/h3>\n\n\n\n<p>Le volume du silicium change de plus de 280% lorsqu&#039;il est enti\u00e8rement lithi\u00e9. Le processus d&#039;insertion du lithium est comme souffler de l&#039;air dans un ballon d\u00e9gonfl\u00e9. <a href=\"https:\/\/en.wikipedia.org\/wiki\/Balloon\">ballon<\/a>. \u00c0 mesure que la teneur en gaz augmente, le ballon continue de se dilater. Le processus d&#039;\u00e9limination des ions lithium est similaire au d\u00e9gonflage d&#039;un ballon, et le volume revient \u00e0 sa taille d&#039;origine.<\/p>\n\n\n\n<p>Cependant, en tant que particule solide, le silicium n&#039;a pas une bonne d\u00e9formation \u00e9lastique comme un ballon. Les particules de silicium, avec leur expansion et leur contraction continues, sont tr\u00e8s susceptibles de provoquer de graves fissures et une pulv\u00e9risation du mat\u00e9riau de l&#039;anode et de la couche d&#039;\u00e9lectrode. Dans cette situation, une nouvelle interface entre le mat\u00e9riau de l&#039;anode et l&#039;\u00e9lectrolyte se formera, ce qui aura un impact n\u00e9gatif sur la consommation d&#039;\u00e9lectrolyte et l&#039;\u00e9paisseur du SEI.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2.<strong>Le probl\u00e8me de la conductivit\u00e9 \u00e9lectrique <\/strong><\/h3>\n\n\n\n<p>La conductivit\u00e9 \u00e9lectronique du silicium de haute puret\u00e9 (&lt; 10<sup>\u22125<\/sup>&nbsp;S\/cm) et la vitesse de diffusion des ions lithium dans le silicium (10<sup>\u221214<\/sup>\u201410<sup>\u221213<\/sup>&nbsp;cm<sup>2<\/sup>\/s) sont bien inf\u00e9rieures \u00e0 celles du graphite. La conductivit\u00e9 \u00e9lectronique affecterait la transmission des \u00e9lectrons dans le mat\u00e9riau de l&#039;anode, un bon r\u00e9seau conducteur est donc de la plus haute importance. De plus, la conductivit\u00e9 ionique affecterait le processus d&#039;enrobage et d&#039;extraction des ions lithium et raccourcirait la distance de transmission.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Alors, comment r\u00e9soudre ce probl\u00e8me ? La r\u00e9ponse est de combiner du silicium et du graphite. <\/strong><\/h2>\n\n\n\n<p>L&#039;ajout de graphite au mat\u00e9riau en silicium permet d&#039;att\u00e9nuer le changement de volume de l&#039;\u00e9lectrode composite int\u00e9grale. Dans des conditions de faible teneur en silicium (environ 20%), les principaux sites de r\u00e9action pour la formation de l&#039;interface \u00e9lectrolyte solide (SEI) sont fournis par des particules de graphite. L&#039;ajout de graphite au silicium peut am\u00e9liorer la diffusivit\u00e9 de l&#039;\u00e9lectrode et am\u00e9liorer la capacit\u00e9 de traitement dans la fabrication de l&#039;\u00e9lectrode, ce qui permet d&#039;obtenir une densit\u00e9 \u00e9nerg\u00e9tique plus \u00e9lev\u00e9e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Perspectives d&#039;application du silicium trait\u00e9 par broyage dans l&#039;\u00e9lectrode n\u00e9gative de la batterie<\/strong><\/h2>\n\n\n\n<p>En raison de sa capacit\u00e9 sp\u00e9cifique th\u00e9orique \u00e9lev\u00e9e et de sa densit\u00e9 \u00e9nerg\u00e9tique, le silicium peut am\u00e9liorer consid\u00e9rablement les performances de la batterie. Les mat\u00e9riaux d&#039;\u00e9lectrode n\u00e9gative \u00e0 base de silicium, tels que l&#039;oxyde de silicium rev\u00eatu de carbone, le nano-carbone de silicium, le nano-fil de silicium et l&#039;alliage de silicium amorphe, ont d\u00e9sormais une large application dans les domaines des batteries d&#039;alimentation, des batteries de stockage d&#039;\u00e9nergie et des batteries grand public. \u00c0 l&#039;avenir, les mat\u00e9riaux d&#039;\u00e9lectrode n\u00e9gative \u00e0 base de silicium deviendront le centre d&#039;int\u00e9r\u00eat de l&#039;industrie des batteries et atteindront des applications commerciales \u00e0 grande \u00e9chelle.<\/p>\n\n\n\n<p>Le silicium utilis\u00e9 dans les mat\u00e9riaux d&#039;\u00e9lectrode n\u00e9gative de batterie est principalement sous forme nano, nous pouvons obtenir de la poudre de nano silicium gr\u00e2ce \u00e0 un broyeur, par exemple :<a href=\"http:\/\/quartz-grinding.com\/products-category\/ball-mill-and-air-classifier-production-line\/\"><strong> broyeur \u00e0 billes<\/strong>.<\/a> Dans le m\u00eame temps, afin d&#039;am\u00e9liorer les performances \u00e9lectrochimiques du mat\u00e9riau d&#039;\u00e9lectrode n\u00e9gative en silicium, une modification du silicium est n\u00e9cessaire. En tant que fabricant professionnel d&#039;\u00e9quipements de poudre, <a href=\"http:\/\/quartz-grinding.com\/about-us\/\"><strong><em><strong><em>Qingdao Epic Powder Machinery Co., Ltd<\/em><\/strong><\/em><\/strong>.<\/a> peut produire <strong>broyeur \u00e0 boulets et syst\u00e8me de modification de rev\u00eatement de surface<\/strong>&nbsp;pour le traitement du silicium. Si vous avez des besoins et des questions connexes, veuillez contacter <strong><a href=\"http:\/\/quartz-grinding.com\/contact-us\/\">L&#039;\u00e9pop\u00e9e de Qingdao<\/a><\/strong>.<\/p>\n\n\n\n<p>Vous trouverez ci-dessous des photos pour votre r\u00e9f\u00e9rence.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"625\" height=\"835\" src=\"http:\/\/quartz-grinding.com\/wp-content\/uploads\/2024\/10\/ball-mill-for-quartz-2.png\" alt=\"\" class=\"wp-image-15863\" srcset=\"https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/ball-mill-for-quartz-2.png 625w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/ball-mill-for-quartz-2-225x300.png 225w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/ball-mill-for-quartz-2-9x12.png 9w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/ball-mill-for-quartz-2-600x802.png 600w\" sizes=\"(max-width: 625px) 100vw, 625px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"902\" height=\"942\" src=\"http:\/\/quartz-grinding.com\/wp-content\/uploads\/2024\/10\/pin-mill-modifier-1.png\" alt=\"\" class=\"wp-image-15840\" srcset=\"https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/pin-mill-modifier-1.png 902w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/pin-mill-modifier-1-287x300.png 287w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/pin-mill-modifier-1-768x802.png 768w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/pin-mill-modifier-1-11x12.png 11w, https:\/\/www.quartz-grinding.com\/wp-content\/uploads\/2024\/10\/pin-mill-modifier-1-600x627.png 600w\" sizes=\"(max-width: 902px) 100vw, 902px\" \/><\/figure>","protected":false},"excerpt":{"rendered":"<p>Avec le d\u00e9veloppement rapide de la technologie des batteries, le silicium devient progressivement un mat\u00e9riau d\u2019\u00e9lectrode n\u00e9gative potentiel. D\u00e8s les ann\u00e9es 1970, on a d\u00e9couvert la r\u00e9action \u00e9lectrochimique entre le lithium (Li) et le silicium \u00e9l\u00e9mentaire [\u2026]<\/p>","protected":false},"author":1,"featured_media":15865,"comment_status":"closed","ping_status":"closed","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":"","ast-disable-related-posts":"","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":"","background-image":"","background-repeat":"repeat","background-position":"center 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