Polymer electrolytes based on cross-linked cyclotriphosphazenes.
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| Title: | Polymer electrolytes based on cross-linked cyclotriphosphazenes. |
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| Authors: | Kaskhedikar, N.1, Burjanadze, M.1, Karatas, Y.1,2, Wiemhöfer, H.-D.1 hdw@uni-muenster.de |
| Source: | Solid State Ionics. Nov2006, Vol. 177 Issue 35/36, p3129-3134. 6p. |
| Subjects: | Physical sciences, Polyelectrolytes, Biomechanics, Physical & theoretical chemistry |
| Abstract: | Substituted cyclotriphosphazenes were used to prepare lithium ion conducting polymer networks. Two types of compounds were synthesized starting with the precursor hexachlorocyclotriphosphazene (HCCP): Type I (CVEEP) in which all the chlorine atoms in HCCP were replaced by vinyloxyethoxyethoxy groups (VEE = –OCH2CH2OCH2CH2OCH=CH2), and type II (CVMEEP) in which half of the chlorine was replaced by VEE and the other half by methoxyethoxyethoxy groups (MEE= –OCH2CH2OCH2CH2OCH3). The terminal vinyl groups were used to build up a network by a thermally initiated cross-linking of lithium salt containing membranes. Polymer electrolytes with dissolved LiSO3CF3 and LiN(SO2CF3)2 were investigated by impedance measurements. The ionic conductivity of CVMEEP with 10 wt.% LiSO3CF3 was 3.2×10−5 S/cm at 30 °C and 4.1×10−4 S/cm at 90 °C. Lower conductivity values in the range 10−8–10−9 S/cm were obtained at 30 °C for the highly crosslinked CVEEP. An interesting polymer electrolyte with good mechanical properties and a good conductivity of 1.3 × 10−5 S/cm (30 °C) was obtained from a solution of MEEP (=poly[bis(methoxy–ethoxy–ethoxy)phosphazene]) and LiSO3CF3 in CVEEP as an interpenetrating network. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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