Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows"
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/13611 |
Resumo: | The sol-gel process has been used to prepare hybrid electrolytes composed of a poly(oxyethylene) (POE)/siloxane hybrid network doped with lithium tetrafluoroborate (LiBF4) with compositions of n between ∞ and 2.5. In this context the lithium salt concentration is expressed in terms of the number of oxyethylene units in the organic component of the network per Li+ ion. Electrolyte samples with n ≥ 20 are thermally stable up to approximately 250 ºC. All the materials synthesized are semi-crystalline: in the composition range n ≥ 15 free crystalline POE exists and at 60 ≥ n ≥ 2.5 evidence of the presence of a crystalline POE/LiBF4 compound has been found. At n = 2.5 this latter crystalline phase coexists with free salt. The room temperature conductivity maximum of this electrolyte system is located at n = 10 (1.5x10-5 S cm-1 at 22 ºC). The electrochemical stability domain of the sample with n = 15 spans about 5.5 V versus Li/Li+. This new series of materials represents a promising alternative to the LiTFSI- and LiClO4-doped POE and POE/siloxane analogues. Preliminary tests performed with a prototype electrochromic device (ECD) comprising the sample with n = 8 as electrolyte and WO3 as cathodically coloring layer are extremely encouraging. The device exhibits switching time around 50 s, an optical density change of 0.13, open circuit memory of about 4 months and high coloration efficiency (106 cm2C-1 in the 3rd cycle). |
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Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows"Solid polymer electrolyteIonic conductivityThermal analysisElectrocehmical satbilityOrganic/inorganic hybrid electrolytesLithium trifluoroborateIonic conductivityCyclic voltammetryElectrochromic devicelithium tetrafluoroborateScience & TechnologyThe sol-gel process has been used to prepare hybrid electrolytes composed of a poly(oxyethylene) (POE)/siloxane hybrid network doped with lithium tetrafluoroborate (LiBF4) with compositions of n between ∞ and 2.5. In this context the lithium salt concentration is expressed in terms of the number of oxyethylene units in the organic component of the network per Li+ ion. Electrolyte samples with n ≥ 20 are thermally stable up to approximately 250 ºC. All the materials synthesized are semi-crystalline: in the composition range n ≥ 15 free crystalline POE exists and at 60 ≥ n ≥ 2.5 evidence of the presence of a crystalline POE/LiBF4 compound has been found. At n = 2.5 this latter crystalline phase coexists with free salt. The room temperature conductivity maximum of this electrolyte system is located at n = 10 (1.5x10-5 S cm-1 at 22 ºC). The electrochemical stability domain of the sample with n = 15 spans about 5.5 V versus Li/Li+. This new series of materials represents a promising alternative to the LiTFSI- and LiClO4-doped POE and POE/siloxane analogues. Preliminary tests performed with a prototype electrochromic device (ECD) comprising the sample with n = 8 as electrolyte and WO3 as cathodically coloring layer are extremely encouraging. The device exhibits switching time around 50 s, an optical density change of 0.13, open circuit memory of about 4 months and high coloration efficiency (106 cm2C-1 in the 3rd cycle).Fundação para a Ciência e a TecnologiaEsgUniversidade do MinhoBarbosa, P. C.Fernandes, M.Silva, Maria ManuelaSmith, Michael JohnVilela, Sérgio M. F.Gonçalves, A.Olveira, M. C.Fortunato, E.Rego, R.Zea Bermudez, V. de20112011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/13611eng1452-3981The original publication is available at http://www.electrochemsci.org/info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:27:26Zoai:repositorium.sdum.uminho.pt:1822/13611Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:22:01.154954Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows" |
title |
Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows" |
spellingShingle |
Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows" Barbosa, P. C. Solid polymer electrolyte Ionic conductivity Thermal analysis Electrocehmical satbility Organic/inorganic hybrid electrolytes Lithium trifluoroborate Ionic conductivity Cyclic voltammetry Electrochromic device lithium tetrafluoroborate Science & Technology |
title_short |
Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows" |
title_full |
Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows" |
title_fullStr |
Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows" |
title_full_unstemmed |
Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows" |
title_sort |
Di-ureasil hybrids doped with LiBF4: attractive candidates as electrolytes for "Smart Windows" |
author |
Barbosa, P. C. |
author_facet |
Barbosa, P. C. Fernandes, M. Silva, Maria Manuela Smith, Michael John Vilela, Sérgio M. F. Gonçalves, A. Olveira, M. C. Fortunato, E. Rego, R. Zea Bermudez, V. de |
author_role |
author |
author2 |
Fernandes, M. Silva, Maria Manuela Smith, Michael John Vilela, Sérgio M. F. Gonçalves, A. Olveira, M. C. Fortunato, E. Rego, R. Zea Bermudez, V. de |
author2_role |
author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Barbosa, P. C. Fernandes, M. Silva, Maria Manuela Smith, Michael John Vilela, Sérgio M. F. Gonçalves, A. Olveira, M. C. Fortunato, E. Rego, R. Zea Bermudez, V. de |
dc.subject.por.fl_str_mv |
Solid polymer electrolyte Ionic conductivity Thermal analysis Electrocehmical satbility Organic/inorganic hybrid electrolytes Lithium trifluoroborate Ionic conductivity Cyclic voltammetry Electrochromic device lithium tetrafluoroborate Science & Technology |
topic |
Solid polymer electrolyte Ionic conductivity Thermal analysis Electrocehmical satbility Organic/inorganic hybrid electrolytes Lithium trifluoroborate Ionic conductivity Cyclic voltammetry Electrochromic device lithium tetrafluoroborate Science & Technology |
description |
The sol-gel process has been used to prepare hybrid electrolytes composed of a poly(oxyethylene) (POE)/siloxane hybrid network doped with lithium tetrafluoroborate (LiBF4) with compositions of n between ∞ and 2.5. In this context the lithium salt concentration is expressed in terms of the number of oxyethylene units in the organic component of the network per Li+ ion. Electrolyte samples with n ≥ 20 are thermally stable up to approximately 250 ºC. All the materials synthesized are semi-crystalline: in the composition range n ≥ 15 free crystalline POE exists and at 60 ≥ n ≥ 2.5 evidence of the presence of a crystalline POE/LiBF4 compound has been found. At n = 2.5 this latter crystalline phase coexists with free salt. The room temperature conductivity maximum of this electrolyte system is located at n = 10 (1.5x10-5 S cm-1 at 22 ºC). The electrochemical stability domain of the sample with n = 15 spans about 5.5 V versus Li/Li+. This new series of materials represents a promising alternative to the LiTFSI- and LiClO4-doped POE and POE/siloxane analogues. Preliminary tests performed with a prototype electrochromic device (ECD) comprising the sample with n = 8 as electrolyte and WO3 as cathodically coloring layer are extremely encouraging. The device exhibits switching time around 50 s, an optical density change of 0.13, open circuit memory of about 4 months and high coloration efficiency (106 cm2C-1 in the 3rd cycle). |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011 2011-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/13611 |
url |
http://hdl.handle.net/1822/13611 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1452-3981 The original publication is available at http://www.electrochemsci.org/ |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Esg |
publisher.none.fl_str_mv |
Esg |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799132688931618816 |