{"id":80528,"date":"2024-01-14T13:08:30","date_gmt":"2024-01-14T13:08:30","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/celula-de-dioxido-de-litio-manganes-composicao-e-caracteristicas\/"},"modified":"2024-01-20T09:51:37","modified_gmt":"2024-01-20T09:51:37","slug":"celula-de-dioxido-de-litio-manganes-composicao-e-caracteristicas","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/pt-br\/celula-de-dioxido-de-litio-manganes-composicao-e-caracteristicas\/","title":{"rendered":"C\u00e9lula de di\u00f3xido de l\u00edtio-mangan\u00eas | Composi\u00e7\u00e3o e Caracter\u00edsticas |"},"content":{"rendered":"<h2>Baterias de L\u00edtio-Metal: Uma Vis\u00e3o Geral<\/h2>\n<p>As baterias de l\u00edtio-metal, tamb\u00e9m conhecidas como c\u00e9lulas prim\u00e1rias de l\u00edtio, representam um avan\u00e7o significativo na tecnologia de armazenamento de energia. Com uma vida \u00fatil de prateleira de at\u00e9 10 anos e capazes de suportar temperaturas de at\u00e9 70 graus Celsius, estas baterias oferecem uma combina\u00e7\u00e3o \u00fanica de longevidade e durabilidade.<\/p>\n<h2>Tipos Comuns de C\u00e9lulas de L\u00edtio-Metal<\/h2>\n<p>Dentre os tipos mais comuns de baterias de l\u00edtio-metal, destacam-se:<\/p>\n<ul>\n<li><strong>C\u00e9lula de Di\u00f3xido de Mangan\u00eas-L\u00edtio:<\/strong> Utiliza folha de l\u00edtio como \u00e2nodo e di\u00f3xido de mangan\u00eas como c\u00e1todo, com uma voltagem geral de 3 volts. Comum em c\u00e9lulas de bot\u00e3o como a CR2032.<\/li>\n<li><strong>C\u00e9lula de Disulfeto de Ferro-L\u00edtio:<\/strong> Composta por l\u00edtio no \u00e2nodo e disulfeto de ferro no c\u00e1todo, estas baterias cil\u00edndricas t\u00eam uma voltagem nominal de 1,5 volts, sendo frequentemente usadas em baterias AA de alto desempenho.<\/li>\n<li><strong>C\u00e9lula de Cloreto de Tionila-L\u00edtio:<\/strong> Reconhecida pela sua alta densidade energ\u00e9tica e vida \u00fatil de 15 a 20 anos.<\/li>\n<li><strong>C\u00e9lula de Ar-L\u00edtio:<\/strong> Similar \u00e0s c\u00e9lulas de ar-zinco, destaca-se pela sua elevada densidade energ\u00e9tica te\u00f3rica.<\/li>\n<\/ul>\n<h2>Rea\u00e7\u00e3o Qu\u00edmica nas C\u00e9lulas de Di\u00f3xido de Mangan\u00eas-L\u00edtio<\/h2>\n<p>A rea\u00e7\u00e3o qu\u00edmica global nas c\u00e9lulas de di\u00f3xido de mangan\u00eas-l\u00edtio \u00e9 expressa pela equa\u00e7\u00e3o:<\/p>\n<p><code>Li(s) + Mn<sup>IV<\/sup>O<sub>2<\/sub>(s) \u21cc Mn<sup>III<\/sup>O<sub>2<\/sub>(Li<sup>+<\/sup>) [E\u00b0 = +3.19 V]<\/code><\/p>\n<h2>Princ\u00edpio Qu\u00edmico das Baterias de L\u00edtio-Metal<\/h2>\n<p>As baterias de l\u00edtio-metal funcionam com base no princ\u00edpio de rea\u00e7\u00f5es de oxida\u00e7\u00e3o-redu\u00e7\u00e3o. Nestas rea\u00e7\u00f5es, o \u00e2nodo de l\u00edtio met\u00e1lico \u00e9 oxidado, perdendo el\u00e9trons, enquanto o c\u00e1todo, como o di\u00f3xido de mangan\u00eas, \u00e9 reduzido, ganhando el\u00e9trons. A separa\u00e7\u00e3o f\u00edsica do c\u00e1todo e do \u00e2nodo evita uma rea\u00e7\u00e3o direta, direcionando o fluxo de el\u00e9trons atrav\u00e9s do circuito externo quando a bateria \u00e9 utilizada em um dispositivo.<\/p>\n<p>Na c\u00e9lula de di\u00f3xido de mangan\u00eas-l\u00edtio, por exemplo, os \u00edons de l\u00edtio (Li<sup>+<\/sup>) migram atrav\u00e9s do eletr\u00f3lito e do separador para o c\u00e1todo, enquanto os el\u00e9trons viajam pelo circuito externo at\u00e9 o c\u00e1todo. Aqui, o MnO<sub>2<\/sub> \u00e9 reduzido de um estado tetravalente para trivalente, e o produto da rea\u00e7\u00e3o de descarga permanece s\u00f3lido no c\u00e1todo, sem gerar gases e causar condi\u00e7\u00f5es pressurizadas.<\/p>\n<h2>Diferen\u00e7as entre Baterias Prim\u00e1rias e Secund\u00e1rias de L\u00edtio<\/h2>\n<p>\u00c9 fundamental distinguir entre as baterias prim\u00e1rias de l\u00edtio, como as descritas acima, e as baterias secund\u00e1rias de l\u00edtio, como as de \u00edon de l\u00edtio e pol\u00edmero de l\u00edtio. Enquanto as prim\u00e1rias s\u00e3o n\u00e3o recarreg\u00e1veis e cont\u00eam l\u00edtio met\u00e1lico, as secund\u00e1rias s\u00e3o recarreg\u00e1veis e n\u00e3o cont\u00eam l\u00edtio met\u00e1lico em sua composi\u00e7\u00e3o.<\/p>\n<h2>Conclus\u00e3o<\/h2>\n<p>As baterias de l\u00edtio-metal representam uma solu\u00e7\u00e3o de armazenamento de energia confi\u00e1vel e de longa dura\u00e7\u00e3o, adequadas para uma ampla gama de aplica\u00e7\u00f5es. Seu princ\u00edpio de funcionamento baseia-se em rea\u00e7\u00f5es eletroqu\u00edmicas eficientes, oferecendo uma densidade energ\u00e9tica elevada e uma vida \u00fatil impressionante. A compreens\u00e3o dessas tecnologias \u00e9 essencial para o avan\u00e7o cont\u00ednuo no campo do armazenamento de energia.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.electricity-magnetism.org\/wp-content\/uploads\/2022\/09\/Lithium-manganese-Dioxide-Cell-composition.png\" alt=\"\" \/><\/p>\n<div style=\"text-align: center; font-size: 20px;\">\n    <a href=\"https:\/\/www.electricity-magnetism.org\/electric-battery\/lithium-manganese-dioxide-cell\/\">Original Article<\/a>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A c\u00e9lula de di\u00f3xido de l\u00edtio-mangan\u00eas usa folha de l\u00edtio como \u00e2nodo e di\u00f3xido de mangan\u00eas como c\u00e1todo. O eletr\u00f3lito \u00e9 uma folha separadora impregnada com sais eletrol\u00edticos. A tens\u00e3o geral da c\u00e9lula \u00e9 de 3 volts.<\/p>\n","protected":false},"author":1,"featured_media":4173,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[14],"tags":[],"class_list":["post-80528","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nao-categorizado","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u00e9lula de di\u00f3xido de l\u00edtio-mangan\u00eas | Composi\u00e7\u00e3o e Caracter\u00edsticas |<\/title>\n<meta name=\"description\" content=\"A c\u00e9lula de di\u00f3xido de l\u00edtio-mangan\u00eas usa folha de l\u00edtio como \u00e2nodo e di\u00f3xido de mangan\u00eas como c\u00e1todo. O eletr\u00f3lito \u00e9 uma folha separadora impregnada com sais eletrol\u00edticos. A tens\u00e3o geral da c\u00e9lula \u00e9 de 3 volts.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.electricity-magnetism.org\/pt-br\/celula-de-dioxido-de-litio-manganes-composicao-e-caracteristicas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00e9lula de di\u00f3xido de l\u00edtio-mangan\u00eas | Composi\u00e7\u00e3o e Caracter\u00edsticas |\" \/>\n<meta property=\"og:description\" content=\"A c\u00e9lula de di\u00f3xido de l\u00edtio-mangan\u00eas usa folha de l\u00edtio como \u00e2nodo e di\u00f3xido de mangan\u00eas como c\u00e1todo. O eletr\u00f3lito \u00e9 uma folha separadora impregnada com sais eletrol\u00edticos. 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