Simultaneously enhancing ionic conductivity and mechanical properties of solid polymer electrolytes via a copolymer multi-functional filler

It is a compelling challenge to both improve ionic conductivity and mechanical properties in polymeric electrolytes and to accomplish it through a simple processing method This study reveals that poly(ethylene oxide)-block-polyethylene (PEO-b-PE) possesses a capability for enhancing the multiple performances of PEO-based polymer electrolyte le it functions as a multi-functional miscible filler for obtaining poly(ethylene oxide)(PEO)/lithium perchlorate (LiClO4) having such enhanced performances In this paper remarkable enhancements in both ionic conductivity and mechanical properties are presented and analyzed Investigations on the ion transportation behavior in the polymer electrolytes through optical micrograph X-ray diffraction Fourier transform infrared and dielectric spectrum analyses revealed that the ionic conductivity of a ternary polymer electrolyte PEO/PEO-b-PE/LiClO4 was enhanced by an order of magnitude with the addition of this copolymer The results of tensile tests showed the ultimate stress of the ternary polymer electrolyte increased to 7 29 MPa modulus 114 21 MPa and breaking strain 1142 53% which are 2252% 688% and 274% higher than that of PEO/LiClO4 respectively This study highlights that this kind of copolymer is a promising candidate for high performance solid polymer electrolytes in lithium battery applications (C) 2010 Elsevier Ltd All rights reserved