Preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery

This research focused on the development of new thin film electrolytes based on Poly(methyl methacrylate)(PMMA) / 50% epoxidised natural rubber (ENR 50) blend by solvent casting method. Lithium nitrate (LiNO3), lithium triflate (LiCF3SO3) and lithium imides (LiN(CF3SO2) 2) salts were used as the dop...

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Main Author:	Abdul Latif, Famiza
Format:	Thesis
Language:	English
Published:	2006
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/1286/1/FamizaAbdulLatifPFS2006.pdf
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spelling	my-utm-ep.12862018-02-20T03:48:55Z Preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery 2006-06 Abdul Latif, Famiza QD Chemistry This research focused on the development of new thin film electrolytes based on Poly(methyl methacrylate)(PMMA) / 50% epoxidised natural rubber (ENR 50) blend by solvent casting method. Lithium nitrate (LiNO3), lithium triflate (LiCF3SO3) and lithium imides (LiN(CF3SO2) 2) salts were used as the doping material to provide lithium ion for the ionic conduction. Dimethyl carbonate (DMC), ethylene carbonate (EC) and propylene carbonate (PC) plasticizers were used to improve the physical properties and the morphology of the films. Freestanding films were obtained when PMMA was blended with 10% and 20% of ENR 50. Above these compositions, the films became brittle and bonded strongly to the glass substrate. The blend films were not homogeneous in which the phase separation can be observed in their FESEM micrographs even in the presence of plasticizers. Though the films were not homogeneous, the brittle properties of PMMA film have been improved. The DSC thermograms of these films further confirmed the in-homogeneity of the blends by exhibiting two glass transition temperatures, Tg. The infra red (IR) spectra established the PMMA-ENR 50 interactions and the polymer-salt complexation. Doped PMMA / ENR 50 films with LiNO3 salt were observed to be unstable where by the films obtained became damp and opaque when exposed to the ambient environment. It was observed that the best salt for this PMMA / ENR 50 blend was LiCF3SO3 in which the highest conductivity of 10-5 S/cm at room temperature were obtained. On the other hand, PMMA / ENR 50 / LiN(CF3SO2) 2 electrolyte exhibited the lowest ionic conductivity of 10-7 S/cm at room temperature. The effect of plasticizers differs from one electrolyte system to another. The ionic conduction behaviour in the electrolyte systems depends on the salt and the plasticizers used. The transference number and the modulus formalism showed that the PMMA / ENR 50 blend based electrolytes were ionic conductor. The equivalent circuit for the highest conducting film from each plasticized or non-plasticized electrolyte system was determined using Autolab software. Films with 10-5 S/cm at room temperature were fabricated into LiNiCoO2/ polymer electrolyte / mesocarbon microbeads (MCMB) cell. It was observed that these cells exhibit poor charge-discharge characteristic and can be improved 2006-06 Thesis http://eprints.utm.my/id/eprint/1286/ http://eprints.utm.my/id/eprint/1286/1/FamizaAbdulLatifPFS2006.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Abdul Latif, Famiza Preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery
description	This research focused on the development of new thin film electrolytes based on Poly(methyl methacrylate)(PMMA) / 50% epoxidised natural rubber (ENR 50) blend by solvent casting method. Lithium nitrate (LiNO3), lithium triflate (LiCF3SO3) and lithium imides (LiN(CF3SO2) 2) salts were used as the doping material to provide lithium ion for the ionic conduction. Dimethyl carbonate (DMC), ethylene carbonate (EC) and propylene carbonate (PC) plasticizers were used to improve the physical properties and the morphology of the films. Freestanding films were obtained when PMMA was blended with 10% and 20% of ENR 50. Above these compositions, the films became brittle and bonded strongly to the glass substrate. The blend films were not homogeneous in which the phase separation can be observed in their FESEM micrographs even in the presence of plasticizers. Though the films were not homogeneous, the brittle properties of PMMA film have been improved. The DSC thermograms of these films further confirmed the in-homogeneity of the blends by exhibiting two glass transition temperatures, Tg. The infra red (IR) spectra established the PMMA-ENR 50 interactions and the polymer-salt complexation. Doped PMMA / ENR 50 films with LiNO3 salt were observed to be unstable where by the films obtained became damp and opaque when exposed to the ambient environment. It was observed that the best salt for this PMMA / ENR 50 blend was LiCF3SO3 in which the highest conductivity of 10-5 S/cm at room temperature were obtained. On the other hand, PMMA / ENR 50 / LiN(CF3SO2) 2 electrolyte exhibited the lowest ionic conductivity of 10-7 S/cm at room temperature. The effect of plasticizers differs from one electrolyte system to another. The ionic conduction behaviour in the electrolyte systems depends on the salt and the plasticizers used. The transference number and the modulus formalism showed that the PMMA / ENR 50 blend based electrolytes were ionic conductor. The equivalent circuit for the highest conducting film from each plasticized or non-plasticized electrolyte system was determined using Autolab software. Films with 10-5 S/cm at room temperature were fabricated into LiNiCoO2/ polymer electrolyte / mesocarbon microbeads (MCMB) cell. It was observed that these cells exhibit poor charge-discharge characteristic and can be improved
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abdul Latif, Famiza
author_facet	Abdul Latif, Famiza
author_sort	Abdul Latif, Famiza
title	Preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery
title_short	Preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery
title_full	Preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery
title_fullStr	Preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery
title_full_unstemmed	Preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery
title_sort	preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2006
url	http://eprints.utm.my/id/eprint/1286/1/FamizaAbdulLatifPFS2006.pdf
_version_	1747814372993925120

Preparation and characterization of poly (methyl methacrylate) / 50% epoxidised natural rubber based solid electrolytes for lithium-ion secondary battery

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