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Enhancement of meltdown temperature of the polyethylene lithium-ion battery separator via surface coating with polymers having high thermal resistance / Y. S. Chung in Industrial & engineering chemistry research, Vol. 48 N° 9 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4346–4351 Titre : Enhancement of meltdown temperature of the polyethylene lithium-ion battery separator via surface coating with polymers having high thermal resistance Type de document : texte imprimé Auteurs : Y. S. Chung, Auteur ; S. H. Yoo, Auteur ; C. K. Kim, Auteur Année de publication : 2009 Article en page(s) : pp. 4346–4351 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Lithium-ion  battery  Polyethylene  separators  Thermal  runaway  reactions Résumé : When a lithium-ion battery is overcharged, it starts to self-heat because of exothermic reactions occurring within the components of the cell. Separator shutdown is a useful safety feature for preventing thermal runaway reactions in lithium-ion batteries. The polyethylene (PE) separators used here had shutdown temperatures of around 135 °C. Because the cell temperature continues to increase before actually beginning to cool even after shutdown, the separator should have a higher meltdown temperature than the shutdown temperature to work as an insulator even above the shutdown temperature. To enhance the meltdown temperature of the separator, in this study, a PE separator was coated with polymers synthesized from various ethylene glycol dimethacrylate monomers. When the separator was coated with polymer synthesized from diethylene glycol dimethacrylate (DEGDMA), its shutdown temperature and meltdown temperature were increased to 142 and 155 °C, respectively. Furthermore, a slight increase in the air permeability of the separator was observed when the separator was coated with polymer synthesized from an ethanol solution containing the proper amount of DEGDMA. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900096z [article] Enhancement of meltdown temperature of the polyethylene lithium-ion battery separator via surface coating with polymers having high thermal resistance [texte imprimé] / Y. S. Chung, Auteur ; S. H. Yoo, Auteur ; C. K. Kim, Auteur . - 2009 . - pp. 4346–4351. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 9 (Mai 2009) . - pp. 4346–4351 Mots-clés : Lithium-ion  battery  Polyethylene  separators  Thermal  runaway  reactions Résumé : When a lithium-ion battery is overcharged, it starts to self-heat because of exothermic reactions occurring within the components of the cell. Separator shutdown is a useful safety feature for preventing thermal runaway reactions in lithium-ion batteries. The polyethylene (PE) separators used here had shutdown temperatures of around 135 °C. Because the cell temperature continues to increase before actually beginning to cool even after shutdown, the separator should have a higher meltdown temperature than the shutdown temperature to work as an insulator even above the shutdown temperature. To enhance the meltdown temperature of the separator, in this study, a PE separator was coated with polymers synthesized from various ethylene glycol dimethacrylate monomers. When the separator was coated with polymer synthesized from diethylene glycol dimethacrylate (DEGDMA), its shutdown temperature and meltdown temperature were increased to 142 and 155 °C, respectively. Furthermore, a slight increase in the air permeability of the separator was observed when the separator was coated with polymer synthesized from an ethanol solution containing the proper amount of DEGDMA. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900096z

Enhancement of the meltdown temperature of a lithium ion battery separator via a nanocomposite coating / S. H. Yoo in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9936–9941 Titre : Enhancement of the meltdown temperature of a lithium ion battery separator via a nanocomposite coating Type de document : texte imprimé Auteurs : S. H. Yoo, Auteur ; C. K. Kim, Auteur Année de publication : 2010 Article en page(s) : pp. 9936–9941 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Lithium  ion  battery  separator  Meltdown  temperature Résumé : In a previous study, a lithium ion battery separator was coated with polymers synthesized from various ethylene glycol dimethacrylates to enhance its meltdown temperature. The meltdown temperature of the separator was increased to 155 °C when it was coated with polymer synthesized from diethylene glycol dimethacrylate (DEGDMA). In this study, a PE separator was coated with nanocomposites composed of DEGDMA polymer and silica nanoparticles for further enhancement of the meltdown temperature. Coatings with nanocomposites were prepared via two different methods: coating the separator by reacting a methanol solution containing DEGDMA and silica nanoparticles or coating the separator by reacting with a methanol solution containing water, DEGDMA, and tetraethylorthosilicate. The formation of nanocomposite on the separator was confirmed by FT-IR, EDS, and electron microscopy. Regardless of the coating method, an increase in the meltdown temperature with a decrease in the air permeability was observed with the nanocomposite coating. The meltdown temperature of the separator was increased to 170 °C with an acceptable reduction in the air permeability when the separator was coated with composite using the latter method. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901141u [article] Enhancement of the meltdown temperature of a lithium ion battery separator via a nanocomposite coating [texte imprimé] / S. H. Yoo, Auteur ; C. K. Kim, Auteur . - 2010 . - pp. 9936–9941. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9936–9941 Mots-clés : Lithium  ion  battery  separator  Meltdown  temperature Résumé : In a previous study, a lithium ion battery separator was coated with polymers synthesized from various ethylene glycol dimethacrylates to enhance its meltdown temperature. The meltdown temperature of the separator was increased to 155 °C when it was coated with polymer synthesized from diethylene glycol dimethacrylate (DEGDMA). In this study, a PE separator was coated with nanocomposites composed of DEGDMA polymer and silica nanoparticles for further enhancement of the meltdown temperature. Coatings with nanocomposites were prepared via two different methods: coating the separator by reacting a methanol solution containing DEGDMA and silica nanoparticles or coating the separator by reacting with a methanol solution containing water, DEGDMA, and tetraethylorthosilicate. The formation of nanocomposite on the separator was confirmed by FT-IR, EDS, and electron microscopy. Regardless of the coating method, an increase in the meltdown temperature with a decrease in the air permeability was observed with the nanocomposite coating. The meltdown temperature of the separator was increased to 170 °C with an acceptable reduction in the air permeability when the separator was coated with composite using the latter method. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901141u