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Characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / Chong Woon Gie

In the present study, three systems of polyacrylonitrile (PAN)-based polymer electrolytes samples were prepared. The first system is plasticized-PAN films containing different ratio of ethylene carbonate (EC) and dimethyl phthalate (DMP). The second system is salted-PAN films (PAN-LiBF4) and the thi...

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Main Author: Chong, Woon Gie
Format: Thesis
Published: 2013
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Q Science (General)
Online Access:http://studentsrepo.um.edu.my/4799/1/Thesis_SGR110077.pdf
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spelling my.um.stud.47992015-06-17T06:16:47Z Characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / Chong Woon Gie Chong, Woon Gie Q Science (General) In the present study, three systems of polyacrylonitrile (PAN)-based polymer electrolytes samples were prepared. The first system is plasticized-PAN films containing different ratio of ethylene carbonate (EC) and dimethyl phthalate (DMP). The second system is salted-PAN films (PAN-LiBF4) and the third system is plasticized PAN films containing varying amounts of lithium tetrafluoroborate (PAN-EC-DMP-LiBF4). Pure PAN film was prepared as a reference. The room temperature conductivity for the highest conducting sample in the PAN-EC-DMP system, PAN-LiBF4 system and PAN-EC-DMP-LiBF4 system are 1.11 × 10-6 S cm-1, 1.83 × 10-3 S cm-1 and 1.08 × 10-2 S cm-1, respectively. The conductivity of the PAN-based polymer electrolyte has been found to be salt concentration dependent which is attributed to the increase in the number of mobile ions within the polymer matrix. The temperature dependence of conductivity for the films in PAN-LiBF4 system and PAN-EC-DMP-LiBF4 system from ambient temperature to 353 K obeys Arrhenius rule. The activation energies, Ea for these films were calculated to be in the range between 0.38 eV and 0.22 eV. The interactions of Li+ ions with nitrile groups of PAN in PAN-LiBF4 system and PAN-EC-DMP-LiBF4 system have been confirmed by Fourier Transform Infrared spectroscopy (FTIR). Differential Scanning Calorimetry (DSC) results have shown that both unplasticized and plasticized polymer electrolyte films were found to be thermally stable up to 200 °C. X-ray diffraction (XRD) results and glass transitions temperature studies have revealed that the crystalline region of PAN was effectively decreased upon addition of salt and plasticizers. The ionic and cationic transference numbers were evaluated by DC and combined DC and AC polarization methods to determine the charge carrier species within the polymer electrolyte films. The lithium ion conduction in the polymer electrolyte films is confirmed from Cyclic Voltammetry (CV) and transport number measurements. Linear sweep voltammetry (LSV) was employed to iv estimate the decomposition potential of the polymer electrolytes. The films were found to be electrochemically stable up to 4.4 V. A Li/LiCoO2 cell with the most electrochemically stable polymer electrolyte film has been fabricated and tested. 2013 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/4799/1/Thesis_SGR110077.pdf Chong, Woon Gie (2013) Characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / Chong Woon Gie. Masters thesis, University of Malaya. http://studentsrepo.um.edu.my/4799/
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Student Repository
url_provider http://studentsrepo.um.edu.my/
topic Q Science (General)
spellingShingle Q Science (General)
Chong, Woon Gie
Characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / Chong Woon Gie
description In the present study, three systems of polyacrylonitrile (PAN)-based polymer electrolytes samples were prepared. The first system is plasticized-PAN films containing different ratio of ethylene carbonate (EC) and dimethyl phthalate (DMP). The second system is salted-PAN films (PAN-LiBF4) and the third system is plasticized PAN films containing varying amounts of lithium tetrafluoroborate (PAN-EC-DMP-LiBF4). Pure PAN film was prepared as a reference. The room temperature conductivity for the highest conducting sample in the PAN-EC-DMP system, PAN-LiBF4 system and PAN-EC-DMP-LiBF4 system are 1.11 × 10-6 S cm-1, 1.83 × 10-3 S cm-1 and 1.08 × 10-2 S cm-1, respectively. The conductivity of the PAN-based polymer electrolyte has been found to be salt concentration dependent which is attributed to the increase in the number of mobile ions within the polymer matrix. The temperature dependence of conductivity for the films in PAN-LiBF4 system and PAN-EC-DMP-LiBF4 system from ambient temperature to 353 K obeys Arrhenius rule. The activation energies, Ea for these films were calculated to be in the range between 0.38 eV and 0.22 eV. The interactions of Li+ ions with nitrile groups of PAN in PAN-LiBF4 system and PAN-EC-DMP-LiBF4 system have been confirmed by Fourier Transform Infrared spectroscopy (FTIR). Differential Scanning Calorimetry (DSC) results have shown that both unplasticized and plasticized polymer electrolyte films were found to be thermally stable up to 200 °C. X-ray diffraction (XRD) results and glass transitions temperature studies have revealed that the crystalline region of PAN was effectively decreased upon addition of salt and plasticizers. The ionic and cationic transference numbers were evaluated by DC and combined DC and AC polarization methods to determine the charge carrier species within the polymer electrolyte films. The lithium ion conduction in the polymer electrolyte films is confirmed from Cyclic Voltammetry (CV) and transport number measurements. Linear sweep voltammetry (LSV) was employed to iv estimate the decomposition potential of the polymer electrolytes. The films were found to be electrochemically stable up to 4.4 V. A Li/LiCoO2 cell with the most electrochemically stable polymer electrolyte film has been fabricated and tested.
format Thesis
author Chong, Woon Gie
author_facet Chong, Woon Gie
author_sort Chong, Woon Gie
title Characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / Chong Woon Gie
title_short Characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / Chong Woon Gie
title_full Characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / Chong Woon Gie
title_fullStr Characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / Chong Woon Gie
title_full_unstemmed Characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / Chong Woon Gie
title_sort characteristics of polyacrylonitrile pan-based polymer electrolytes for battery applications / chong woon gie
publishDate 2013
url http://studentsrepo.um.edu.my/4799/1/Thesis_SGR110077.pdf
http://studentsrepo.um.edu.my/4799/
_version_ 1738505712855678976
score 13.211869

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