Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/829 |
Resumo: | Technological advances in portable devices imply not only the development of devices but also the need to enhance their power sources. For instance, cellular phones with high technology incorporating Bluetooth, Infrared, Digital Camera, Games, GPS, Internet Browsing, etc., need high performance rechargeable batteries. Lithium ion-conducting glass-ceramics with NASICONtype structure, based on the Li1+xMxM'2-x(PO4)3 system, where M = Al, Cr, Fe, Ga and M' = Ge, Ti, Hf, are considered good candidates as solid electrolytes in lithium ion batteries due to their chemical stability, easy fabrication and high ionic conductivity. In this work, the Li1+xAlxTi2-x(PO4)3 glass composition was synthesized by the traditional method known as Splat Cooling. Glass-ceramics with the same composition as the precursor glass but with different microstructures were obtained by controlled crystallization, using single and double heat treatments. The parent glass was characterized by chemical and thermal analysis and the latter enabled tailoring of the crystallization heat treatments. X-ray diffraction (XRD) results indicated that the resulting glassceramics exhibit the desired NASICON-type structure as primary phase, as well as the segregation of insulating phases, i.e., AlPO4 and/or TiO2, which do not affect the electrical properties. An examination of the microstructure by scanning electron microscopy (SEM) and measurements of electrical conductivity by impedance spectroscopy (IS), combined with the XRD analysis, indicated that the electrical conductivity of single heat-treated samples increases with the heat treatment temperature and hence with the increase in crystallinity. Samples synthesized by double heat treatment showed increasing electrical conductivity with decreasing nucleation treatment time and consequently with increasing average grain size. |
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Semanate, José Luis NarváezRodrigues, Ana Candida Martinshttp://lattes.cnpq.br/4499231813051400http://lattes.cnpq.br/98245589974960230690a22b-4996-47fe-9013-65b9225efdc92016-06-02T19:12:08Z2011-01-252016-06-02T19:12:08Z2009-08-21SEMANATE, José Luis Narváez. Synthesis and electrical conductivity of Li1+xAlxTi2-x(PO4)3 glass-ceramic with different microstructures. 2009. 111 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2009.https://repositorio.ufscar.br/handle/ufscar/829Technological advances in portable devices imply not only the development of devices but also the need to enhance their power sources. For instance, cellular phones with high technology incorporating Bluetooth, Infrared, Digital Camera, Games, GPS, Internet Browsing, etc., need high performance rechargeable batteries. Lithium ion-conducting glass-ceramics with NASICONtype structure, based on the Li1+xMxM'2-x(PO4)3 system, where M = Al, Cr, Fe, Ga and M' = Ge, Ti, Hf, are considered good candidates as solid electrolytes in lithium ion batteries due to their chemical stability, easy fabrication and high ionic conductivity. In this work, the Li1+xAlxTi2-x(PO4)3 glass composition was synthesized by the traditional method known as Splat Cooling. Glass-ceramics with the same composition as the precursor glass but with different microstructures were obtained by controlled crystallization, using single and double heat treatments. The parent glass was characterized by chemical and thermal analysis and the latter enabled tailoring of the crystallization heat treatments. X-ray diffraction (XRD) results indicated that the resulting glassceramics exhibit the desired NASICON-type structure as primary phase, as well as the segregation of insulating phases, i.e., AlPO4 and/or TiO2, which do not affect the electrical properties. An examination of the microstructure by scanning electron microscopy (SEM) and measurements of electrical conductivity by impedance spectroscopy (IS), combined with the XRD analysis, indicated that the electrical conductivity of single heat-treated samples increases with the heat treatment temperature and hence with the increase in crystallinity. Samples synthesized by double heat treatment showed increasing electrical conductivity with decreasing nucleation treatment time and consequently with increasing average grain size.Os avanços tecnológicos em dispositivos portáteis trazem outro aspecto que chama a atenção, tanto ou mais importante do que os próprios dispositivos desenvolvidos, i.e., a necessidade de fontes de alimentação mais poderosas. Por exemplo, telefones celulares com tecnologia de ponta que incorporam Bluetooth, Infravermelho, Câmara fotográfica, Jogos, GPS, Navegação na Internet, etc., requerem baterias recarregáveis de alto desempenho. Vitrocerâmicas condutoras por íon lítio com estrutura tipo NASICON, concretamente baseadas no sistema Li1+xMxM 2-x(PO4)3, onde M = Al, Cr, Fe, Ga e M = Ge, Ti, Hf, são consideradas boas candidatas como eletrólitos sólidos em baterias de íon lítio devido à sua estabilidade química, facilidade de fabricação e alta condutividade iônica. Neste trabalho foi obtido o vidro de composição Li1.2Al0.6Ti1.6(PO4)2.9 usando o método tradicional de resfriamento rápido conhecido como Splat Cooling. Vitrocerâmicas de composição igual à do vidro matriz, com diferentes microestruturas, foram obtidas por cristalização controlada mediante tratamentos térmicos simples e duplos. O vidro precursor foi caracterizado por análise química e térmica. Esta última permitiu projetar os tratamentos térmicos de cristalização. Os resultados de difração de raios X (DRX) mostraram a obtenção da estrutura tipo NASICON como fase principal, com presença das fases isolantes AlPO4 e/ou TiO2, que não afetam as propriedades elétricas. O estudo da microestrutura e da condutividade elétrica, usando microscopia eletrônica de varredura (MEV) e espectroscopia de impedância (EI), respectivamente, evidenciaram o aumento da condutividade com o crescimento do tamanho médio do grão, atribuído ao maior contato entre grãos e, provavelmente, a um melhor alinhamento dos canais na estrutura do LiTi2(PO4)3. A máxima condutividade de 1,3 x 10-3 S/cm foi atingida na amostra obtida mediante tratamento térmico simples em 1000 °C durante 20 minutos a qual apresentou um tamanho médio de grão de 350 nm.Universidade Federal de Sao Carlosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBRMateriaisCristalizaçãoNucleaçãoEspectroscopia de impedânciaTamanho de grãoCristalinidadeENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAObtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturasSynthesis and electrical conductivity of Li1+xAlxTi2-x(PO4)3 glass-ceramic with different microstructuresinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-1-1901b2e03-1fc6-4525-8d1a-d61ea51a9dc4info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL3392.pdfapplication/pdf2811446https://repositorio.ufscar.br/bitstream/ufscar/829/1/3392.pdf66678ffcdd5a483cfd0aea8e6f3dcb64MD51THUMBNAIL3392.pdf.jpg3392.pdf.jpgIM Thumbnailimage/jpeg6340https://repositorio.ufscar.br/bitstream/ufscar/829/2/3392.pdf.jpg6d3d27fa95b2c0329401feb20bacc04cMD52ufscar/8292023-09-18 18:30:40.175oai:repositorio.ufscar.br:ufscar/829Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:30:40Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas |
dc.title.alternative.eng.fl_str_mv |
Synthesis and electrical conductivity of Li1+xAlxTi2-x(PO4)3 glass-ceramic with different microstructures |
title |
Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas |
spellingShingle |
Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas Semanate, José Luis Narváez Materiais Cristalização Nucleação Espectroscopia de impedância Tamanho de grão Cristalinidade ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas |
title_full |
Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas |
title_fullStr |
Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas |
title_full_unstemmed |
Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas |
title_sort |
Obtenção e condutividade elétrica de vitrocerâmica Li1+xAlxTi2-x(PO4)3 com diferentes microestruturas |
author |
Semanate, José Luis Narváez |
author_facet |
Semanate, José Luis Narváez |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/9824558997496023 |
dc.contributor.author.fl_str_mv |
Semanate, José Luis Narváez |
dc.contributor.advisor1.fl_str_mv |
Rodrigues, Ana Candida Martins |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/4499231813051400 |
dc.contributor.authorID.fl_str_mv |
0690a22b-4996-47fe-9013-65b9225efdc9 |
contributor_str_mv |
Rodrigues, Ana Candida Martins |
dc.subject.por.fl_str_mv |
Materiais Cristalização Nucleação Espectroscopia de impedância Tamanho de grão Cristalinidade |
topic |
Materiais Cristalização Nucleação Espectroscopia de impedância Tamanho de grão Cristalinidade ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
Technological advances in portable devices imply not only the development of devices but also the need to enhance their power sources. For instance, cellular phones with high technology incorporating Bluetooth, Infrared, Digital Camera, Games, GPS, Internet Browsing, etc., need high performance rechargeable batteries. Lithium ion-conducting glass-ceramics with NASICONtype structure, based on the Li1+xMxM'2-x(PO4)3 system, where M = Al, Cr, Fe, Ga and M' = Ge, Ti, Hf, are considered good candidates as solid electrolytes in lithium ion batteries due to their chemical stability, easy fabrication and high ionic conductivity. In this work, the Li1+xAlxTi2-x(PO4)3 glass composition was synthesized by the traditional method known as Splat Cooling. Glass-ceramics with the same composition as the precursor glass but with different microstructures were obtained by controlled crystallization, using single and double heat treatments. The parent glass was characterized by chemical and thermal analysis and the latter enabled tailoring of the crystallization heat treatments. X-ray diffraction (XRD) results indicated that the resulting glassceramics exhibit the desired NASICON-type structure as primary phase, as well as the segregation of insulating phases, i.e., AlPO4 and/or TiO2, which do not affect the electrical properties. An examination of the microstructure by scanning electron microscopy (SEM) and measurements of electrical conductivity by impedance spectroscopy (IS), combined with the XRD analysis, indicated that the electrical conductivity of single heat-treated samples increases with the heat treatment temperature and hence with the increase in crystallinity. Samples synthesized by double heat treatment showed increasing electrical conductivity with decreasing nucleation treatment time and consequently with increasing average grain size. |
publishDate |
2009 |
dc.date.issued.fl_str_mv |
2009-08-21 |
dc.date.available.fl_str_mv |
2011-01-25 2016-06-02T19:12:08Z |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:12:08Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SEMANATE, José Luis Narváez. Synthesis and electrical conductivity of Li1+xAlxTi2-x(PO4)3 glass-ceramic with different microstructures. 2009. 111 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2009. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/829 |
identifier_str_mv |
SEMANATE, José Luis Narváez. Synthesis and electrical conductivity of Li1+xAlxTi2-x(PO4)3 glass-ceramic with different microstructures. 2009. 111 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2009. |
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https://repositorio.ufscar.br/handle/ufscar/829 |
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por |
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por |
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901b2e03-1fc6-4525-8d1a-d61ea51a9dc4 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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BR |
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Universidade Federal de São Carlos |
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