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Synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / Suriani Ibrahim

Nanocomposite solid polymer electrolyte based on poly (ethylene oxide) (PEO) as a host matrix, doped with lithium hexaflurophosphate (LiPF6) salt, plasticized with ethylene carbonate (EC) and dispersed with amorphous carbon nanotubes (αCNTs) as nanocomposite filler were prepared by solution-casting...

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Main Author: Suriani , Ibrahim
Format: Thesis
Published: 2011
Subjects:
T Technology (General)
TJ Mechanical engineering and machinery
Online Access:http://studentsrepo.um.edu.my/8002/1/master_report.pdf
http://studentsrepo.um.edu.my/8002/
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spelling my.um.stud.80022017-11-08T08:53:32Z Synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / Suriani Ibrahim Suriani , Ibrahim T Technology (General) TJ Mechanical engineering and machinery Nanocomposite solid polymer electrolyte based on poly (ethylene oxide) (PEO) as a host matrix, doped with lithium hexaflurophosphate (LiPF6) salt, plasticized with ethylene carbonate (EC) and dispersed with amorphous carbon nanotubes (αCNTs) as nanocomposite filler were prepared by solution-casting technique. The polymer electrolytes were characterized by Impedance Spectroscopy (IS) to obtain the composition of additives which gives the highest conductivity value for each system. At room temperature, the highest conductivity was found to be 1.30 × 10-3 Scm-1 with a composition of PEO - 20wt% LiPF6 - 15wt%EC and αCNTs - 5wt%. The ionic conductivities of the nanocomposite polymer electrolytes increased with temperature and obeyed the Vogel-Tamman-Fulcher (VTF) law. The crystallinity, chemical reaction, thermal behaviour, morphologies and optical properties of the nanocomposite polymer electrolytes were examined by using FTIR, XRD, DSC, TGA, UV Vis and PL Spectrophotometer. FTIR indicates the existence of interactions among PEO, LiPF6, EC and αCNTs. XRD and DSC studies indicate that the increased conductivity was due to the increase in amorphous content. This enhanced the segmental flexibility of polymeric chains and the disordered structure of the electrolytes. TGA studies indicate that the stability of nanocomposite polymer electrolytes was decreased when 5wt% of αCNTs filler was added into plasticized polymer electrolytes. The SEM micrographs showed surface changes when LiPF6, EC and αCNTs were added into the polymer systems. The optical band gaps for PEO - 20wt% LiPF6 - 15wt% EC - 5wt% αCNTs was 4.60 eV. A neural network model was developed which could predict the Nyquist plot of nanocomposite polymer electrolyte system (PEO - LiPF6 - EC - CNT). The Bayesian neural network was found to be successful in predicting the experimental results, which climates the time-consuming studies. 2011-11-21 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/8002/1/master_report.pdf Suriani , Ibrahim (2011) Synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / Suriani Ibrahim. Masters thesis, University of Malaya. http://studentsrepo.um.edu.my/8002/
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 T Technology (General)
TJ Mechanical engineering and machinery
spellingShingle T Technology (General)
TJ Mechanical engineering and machinery
Suriani , Ibrahim
Synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / Suriani Ibrahim
description Nanocomposite solid polymer electrolyte based on poly (ethylene oxide) (PEO) as a host matrix, doped with lithium hexaflurophosphate (LiPF6) salt, plasticized with ethylene carbonate (EC) and dispersed with amorphous carbon nanotubes (αCNTs) as nanocomposite filler were prepared by solution-casting technique. The polymer electrolytes were characterized by Impedance Spectroscopy (IS) to obtain the composition of additives which gives the highest conductivity value for each system. At room temperature, the highest conductivity was found to be 1.30 × 10-3 Scm-1 with a composition of PEO - 20wt% LiPF6 - 15wt%EC and αCNTs - 5wt%. The ionic conductivities of the nanocomposite polymer electrolytes increased with temperature and obeyed the Vogel-Tamman-Fulcher (VTF) law. The crystallinity, chemical reaction, thermal behaviour, morphologies and optical properties of the nanocomposite polymer electrolytes were examined by using FTIR, XRD, DSC, TGA, UV Vis and PL Spectrophotometer. FTIR indicates the existence of interactions among PEO, LiPF6, EC and αCNTs. XRD and DSC studies indicate that the increased conductivity was due to the increase in amorphous content. This enhanced the segmental flexibility of polymeric chains and the disordered structure of the electrolytes. TGA studies indicate that the stability of nanocomposite polymer electrolytes was decreased when 5wt% of αCNTs filler was added into plasticized polymer electrolytes. The SEM micrographs showed surface changes when LiPF6, EC and αCNTs were added into the polymer systems. The optical band gaps for PEO - 20wt% LiPF6 - 15wt% EC - 5wt% αCNTs was 4.60 eV. A neural network model was developed which could predict the Nyquist plot of nanocomposite polymer electrolyte system (PEO - LiPF6 - EC - CNT). The Bayesian neural network was found to be successful in predicting the experimental results, which climates the time-consuming studies.
format Thesis
author Suriani , Ibrahim
author_facet Suriani , Ibrahim
author_sort Suriani , Ibrahim
title Synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / Suriani Ibrahim
title_short Synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / Suriani Ibrahim
title_full Synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / Suriani Ibrahim
title_fullStr Synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / Suriani Ibrahim
title_full_unstemmed Synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / Suriani Ibrahim
title_sort synthesis and characterizations of novel solid polymer electrolytes with carbon nanotube as a filler / suriani ibrahim
publishDate 2011
url http://studentsrepo.um.edu.my/8002/1/master_report.pdf
http://studentsrepo.um.edu.my/8002/
_version_ 1738506089986523136
score 13.211869

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