Date of Award

1-1-2000

Thesis Type

Masters

Document Type

Thesis

Divisions

Faculty of Science

Department

-

Institution

Universiti Malaya

Abstract

Poly(ethylene oxide) (PEO) has been doped with selected organotin compounds. The organotin dopants used were triphenyltin thiocyanate (Ph3SnSCN) and tetramethylammonium dichlorotriphenylstannate [Ph3SnClr[Me4N)•. Tin incorporation in the polymers was established by several physical techniques. The infrared spectroscopic analysis of the Pb3SnSCN - doped electrolyte film showed bands at 2080-2050 cm.·' which are also given by pure Ph3SnSCN. Different concentrations of organotin doped electrolytes were prepared and conductivity studies on these were perfonned using impedance spectroscopy. From the measurements it was found that the best conductivity of 7.6xJ0.g Siem was obtained for the composition with PEO :dopant ratio of90:10 at room temperature. However, it proved possible to increase the conductivity by at least two to three orders of magnitude by the co-addition of plasticizers such as ethylene carbonate (EC) and propylene carbonate (PC), thereby rendering the modified PEO more suitable as an electrolyte material for the solid state batteries. The best conductivity thus attained was of the order of IO , Siem for the film of composition Ph3SnSCN doped PEO : plastizier of 90 :10. The plasticizer component consists of EC and PC in 1:1 ratio.X- ray diffraction analysis confirmed the disruption of the crystalline order of PEO upon interaction with the tin dopants. A similar pattern of results was obtained with tetramethylammonium dichlorotriphenyl stannate as dopant. However, the conductivity was only of the order of 10 _. Scm·' and not as good as that given by the Ph3SnSCN compound. The best conducting sample of triphenyltin thiocyanate-polymer was used in the fabrication of a primary cell using Sn metal as the anode and a carbon-iodine mixture as the cathode material. The fabricated cell showed ao open circuit voltage (OCV) of 0.40V.

Initial

snms

Additional Information

Dissertation (M.A) -- Faculty of Science, Universiti Malaya, 2000.

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