Structure and inter-phase stability in solvent-free low-dimensional polymer electrolytes with high lithium conductivity |
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Authors: | Zheng Yungui Liu Jianguo Liao Yen-Po Ungar Goran Wright Peter V |
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Affiliation: | Department of Engineering Materials, University of Sheffield, Mappin St., Sheffield, UK S1 3JD. |
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Abstract: | Two Williamson procedures for the synthesis of the amphiphilic polymers poly[2,5,8,11,14-pentaoxapentadecamethylene(5-alkyloxy-1,3-phenylene)]I(abbrev. CmO5) are compared. Method X gives polyether-esters; method Y gives pure polyethers. In both, a dehydration reaction gives rise to CmO5-CmO1 copolymers. Two-phase systems of I with polyoxytetramethylene and polyoxytrimethylene copolymers (II) and LiBF(4) have been prepared with and without an interfacial stabiliser copolymer III. Highest and most stable conductivities (>5 x 10(-4) S cm(-1) at ambient) with low temperature dependence were observed with III, but I from method Y showed a tendency to phase separate at ambient. |
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