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http://dx.doi.org/10.5229/JKES.2010.13.3.211

Effect of Lithium Ion Concentration on Electrochemical Properties of BF3LiMA-based Self-doping Gel Polymer Electrolytes  

Kang, Wan-Chul (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.13, no.3, 2010 , pp. 211-216 More about this Journal
Abstract
Boron trifluoride lithium methacrylate ($BF_3$LiMA)-based gel polymer electrolytes (GPEs) were synthesized with various $BF_3$LiMA concentration to elucidate the effect on ionic conductivity and electrochemical stability by a AC impedance and linear sweep voltammetry (LSV). As a result, the highest ionic conductivity reached $5.3{\times}10^{-4}Scm^{-1}$ at $25^{\circ}C$ was obtained for 4 wt% of $BF_3$LiMA. Furthermore, high electrochemical stability up to 4.3 V of the $BF_3$LiMA-based GPE was observed in LSV measurement since the counter anion was immobilized in this self-doped system. On the other hand, it was assumed that there was a rapid decomposition of electrolytes on a lithium metal electrode which results in a high solid electrolyte interface (SEI) resistance. However, a high stability toward graphite or lithium cobalt oxide (LCO) electrode thereby a low SEI resistance was observed from the AC impedance measurement as a function of storage time at $25^{\circ}C$. Consequently, the high ionic conductivity, good electrochemical stability and the good interfacial compatibility with graphite and LCO were achieved in $BF_3$LiMA-based GPE.
Keywords
Gel polymer electrolyte; Self-doping; Lithium secondary battery; Ionic conductivity; Electrochemical stability;
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