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Ionic Conductivity of Polymer Electrolytes
Author(s) -
Cardoso Judith,
Vázquez Gerardo,
SoriaArteche Olivia,
Cruz Raúl,
González Ignacio
Publication year - 2009
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200950927
Subject(s) - thermogravimetric analysis , differential scanning calorimetry , ionic conductivity , lithium (medication) , thermal stability , trifluoromethanesulfonate , electrolyte , glass transition , polymer , materials science , conductivity , ionic bonding , thermal decomposition , chemistry , polymer chemistry , analytical chemistry (journal) , ion , electrode , organic chemistry , thermodynamics , composite material , medicine , physics , endocrinology , catalysis
Abstract In this work, the effect of different salts: LiCF 3 SO 3 (lithium triflate, LiOTf) and LiCl in 1:1 mole ratio in a methacrylate‐type polymer with zwitterionic pendant groups (PMBS‐4) used as host polymer, are evaluated. By means of X‐ray diffraction patterns, the formation of a homogeneous solution is observed in the case of PMBS‐4/LiCl and PMBS‐4/LiOTf. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) allows determination of glass transition temperatures (T g ) and thermal stability of the polymers. T g values of the two polymer electrolytes are 293 ± 2 K against PMBS‐4 which is 291 K. The initial decomposition temperatures (IDT) for PMBS‐4 and PMBS‐4/Lithium salt are 483 K and 460 K, respectively. The ac ionic conductivity ( σ ) was obtained using the electrochemical impedance spectroscopy (EIS). It was found that σ increases as temperature rises following a simple Arrhenius behavior and reaches a value of ∼6 × 10 −4 S/cm in the case of PMBS‐4/LiCl and ∼2 × 10 −2 S/cm in the case of PMBS‐4/LiOTf, both measured at 343 K.