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Ionic conductivities of the complexes of LiClO4 and alternating copolymers of oligomeric poly(ethylene oxide) having biphenyl units in the backbone |
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| Institution: | 1. Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, College of Science, China University of Petroleum (Beijing), Beijing 102249, China;2. Organic Materials & Interfaces, Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, the Netherlands;3. Unconventional Petroleum Research Institute, China University of Petroleum (Beijing), Beijing 102249, China |
| Abstract: | A series of copolymers of predominantly poly(ethylene oxide) (PEO) with biphenyl (BP) units in the backbone were synthesized. The solid polymer electrolytes (SPEs) were prepared from these copolymers (BP-PEG) employing lithium perchlolate (LiClO4) as a lithium salt and their ionic conductivities were investigated to exploit the structure–ionic conductivity relationships as a function of chain length ratio between the flexible PEO chains and rigid BP units. The ionic conductivity increases with increasing PEO length in BP-PEG. The salt concentrations in BP-PEG/LiClO4 complexes were also changed and the results show that maximum conductivity is obtained at EO]/Li+]≈8. The reasons for these findings are discussed in terms of the number of charge carriers and the mobility of the polymer chain. |
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