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http://dx.doi.org/10.5229/JKES.2012.15.4.230

Synthesis of Self-doped Poly(PEGMA-co-BF3LiMA) Electrolytes and Effect of PEGMA Molecular Weight on Ionic Conductivities  

Kim, Kyung-Chan (Department of Engineering Chemistry, Chungbuk National University)
Ryu, Sang-Woog (Department of Engineering Chemistry, Chungbuk National University)
Publication Information
Journal of the Korean Electrochemical Society / v.15, no.4, 2012 , pp. 230-235 More about this Journal
Abstract
Polymer electrolytes consisted of $BF_3LiMA$ and 300 (PEGMA300) or 1100 (PEGMA1100) g $mol^{-1}$ of PEGMA were prepared and the electrochemical properties were characterized. Interestingly, the AC-impedance measurement shows $1.22{\times}10^{-5}S\;cm^{-1}$ of room temperature ionic conductivity from PEGMA1100 based solid polymer electrolytes while $8.54{\times}10^{-7}S\;cm^{-1}$ was observed in PEGMA300 based liquid polymer electrolytes. The more suitable coordination between lithium ion and ethylene oxide (EO) unit might be the reason of higher ionic conductivity which can be possible in PEGMA1100 based electrolytes since it has 23 EO units in monomer. The lithium ion transference number was found to be 0.6 due to the side reactions between $BF_3$ and lithium metal expecially for longer time but 0.9 was observed within 3000 seconds of measuring time which is strong evidence of a single-ion conductor.
Keywords
Molecular weight; Ionic conductivity; Self-doping; Lithium-ion secondary battery; Solid polymer electrolyte;
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