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Structure and inter-phase stability in solvent-free low-dimensional polymer electrolytes with high lithium conductivity.

Research paper by Yungui Y Zheng, Jianguo J Liu, Yen-Po YP Liao, Goran G Ungar, Peter V PV Wright

Indexed on: 29 Sep '04Published on: 29 Sep '04Published in: Dalton Transactions



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.