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Nanostructured Block Copolymer Dry Electrolyte



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Journal of The Electrochemical Society 155 6 A428 A431 2008 A428 0013 4651 2008 155 6 A428 4 23 00 The Electrochemical Society Nanostructured Block Copolymer Dry Electrolyte Ayan Ghosha and Peter Kofinasb z a Department of Chemical and Biomolecular Engineering and bFischell Department of Bioengineering University of Maryland College Park Maryland 20742 USA We report on the synthesis and characterization of a solid state polymer electrolyte with enhanced lithium transport based on a self assembled diblock copolymer The diblock copolymer consists of a poly ethylene oxide PEO block and a random copolymer of methyl methacylate MMA and lithium salt of methacrylic acid MAALi Lithium bis oxalato borate LiBC4O8 LiBOB was used as salt in the dry electrolyte Impedance and temperature studies were carried out to characterize the conductivity performance of the electrolyte The diblock copolymer PEO b PMMA ran PMAALi with added LiBOB in the molar ratio ethylene oxide LiBOB 3 1 was used to form flexible translucent films which exhibited an average ionic conductivity value of 1 26 10 5 S cm 1 at room temperature 21 C Transmission electron microscopy was performed to characterize the morphology of the polymer and differential scanning calorimetry was carried out to study the thermal properties of the electrolyte 2008 The Electrochemical Society DOI 10 1149 1 2901905 All rights reserved Manuscript submitted November 30 2007 revised manuscript received February 26 2008 Available electronically April 9 2008 In recent years interest in polymeric batteries has increased dramatically Current configurations have a liquid or gel electrolyte along with a separator between the anode and cathode This leads to problems with electrolyte loss and decreased performance over time The highly reactive nature of such electrolytes necessitates the use of protective enclosures which add to the size and bulk of the battery The goal of this study is to investigate nanoscale polymer electrolyte flexible



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