Characterization of Plasticized PEO Based Solid Polymer Electrolyte by XRD and AC Impedance Methods

 

K. Ragavendran, * P. Kalyani, A. Veluchamy, S. Banumathi, R. Thirunakaran, T.J. Benedict

Central Electrochemical Research Institute, Karaikudi 630 006, India.

 

Received 5 August 2003; accepted in revised form 8 January 2004

 

Abstract

The ionic conductivity of lithium based solid polymer films prepared from poly (ethylene oxide) (PEO) and lithium hexafluoarsenate (LiAsF₆) with varying compositions of plasticizers likedibutyl sebacate (DBS) and ethylene carbonate (EC) was measured by AC impedance method. Polymer film composition viz. (PEO)₈-LiAsF₆-(DBS)_0.4-(EC)_0.1 has been evaluated as an optimum composition as evidenced from its high conductivity and freestanding ability. The high conductivity observed for the polymer electrolyte with this composition has been attributed to an enhanced amorphous character and a reduced energy barrier to the segmental motion of lithium ions in the matrix. The temperature dependence of conductivity on the polymer films, with and without plasticizers, appears to obey the Arrhenius law.  However, the activation energy of the plasticized polymer film is 0.81 KJ/mol, a value considerably lower than 10 KJ/mol obtained for the unplasticized electrolyte, making the polymer to be a prospective candidate as lithium-ion conducting electrolyte for rechargeable lithium batteries.

 

Keywords: plasticizer, solid polymer electrolyte, conductivity, dibutylsebacate.

 

 

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*Corresponding author. E-mail address: raguelectro@rediffmail.com