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Sains Malaysiana 40(7)(2011): 701–705
Ionic
Conductivity of PEMA-LiClO4 Polymer Electrolytes
(Kekonduksian Ion dalam
Elektrolit Polimer PEMA-LiClO4)
S.N. Amir
Department
of Engineering, Centre for Foundation Studies, International Islamic
University
of Malaysia, 46350 Petaling Jaya, Selangor, Malaysia
R.
Othman
Department
of Sciences, Kuliyyah of Engineering, International Islamic
University
of Malaysia, Jalan Gombak, 53100 Kuala Lumpur, Malaysia
R.H.Y.
Subban
Faculty
of Applied Sciences, Universiti Teknologi MARA
40450
Shah Alam, Selangor, Malaysia
N.S.
Mohamed*
Centre
for Foundation Studies in Science, University of Malaya
50603
Kuala Lumpur, Malaysia
Received:
23 October 2009 / Accepted: 20 September 2010
ABSTRACT
Solid
polymer electrolytes comprised of various weight percent ratios of poly(ethyl
methacrylate) (PEMA) and lithium perchlorate (LiClO4)
salt were prepared via solution casting technique using N,N-dimethylformamide (DMF)
as the solvent. The conductivity values of the electrolytes were determined via
impedance spectroscopy. The conductivity of the PEMA-LiClO4 electrolytes
increased with increasing salt concentration and the highest conductivity
obtained was in the order of 10-6 S cm-1 at
salt concentration of 20 wt%. The conductivity decreased for higher salt
concentration. In order to understand the conductivity behavior, XRD and
dielectric studies were done. The results showed that the conductivity was
influenced by the fraction of amorphous region and number of charge carriers in
the system. The transference number measurement was also performed on the
highest conducting electrolyte systems. The result of the measurement indicated
that the systems were ionic conductors.
Keywords:
Dielectric constant; impedance spectroscopy; Scherrer length
ABSTRAK
Elektrolit
polimer pepejal yang mengandungi pelbagai nisbah peratus berat poli(etil
metakrilat) (PEMA) dan garam litium perklorat (LiClO4)
telah disediakan melalui teknik pengacuan larutan dengan menggunakan
N,N-Dimetilformamida (DMF) sebagai pelarut. Nilai
kekonduksian elektrolit telah ditentukan dengan spektroskopi impedans.
Kekonduksian elektrolit PEMA-LiClO4 meningkat
dengan peningkatan kepekatan garam dan kekonduksian yang paling tinggi di
dapati adalah di dalam julat 10-6 S cm-1 pada
20 peratus berat kepekatan garam. Kekonduksian menurun pada kepekatan garam
yang lebih tinggi. Untuk memahami sifat kekonduksian ini, pembelaun sinar-X dan
kajian dielektrik telah dilakukan. Keputusan menunjukkan bahawa kekonduksian
dipengaruhi oleh bahagian kawasan amorfus dan nombor pembawa cas di dalam
sistem. Pengukuran nombor pemindahan ion pada sistem elektrolit yang mempunyai
kekonduksian paling tinggi juga telah dibuat. Keputusan pengukuran menunjukkan
bahawa sistem adalah konduktor ion.
Kata kunci: Panjang Scherrer; pemalar dielektrik; spektroskopi
impedans
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*Corresponding author; email: nsabirin@um.edu.my
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