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Solvent‐free low‐dimensional polymer electrolytes for lithium–polymer batteries
Author(s) -
Zheng Yungui,
Lui Janguo,
Ungar Goran,
Wright Peter V.
Publication year - 2004
Publication title -
the chemical record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.61
H-Index - 78
eISSN - 1528-0691
pISSN - 1527-8999
DOI - 10.1002/tcr.20012
Subject(s) - materials science , copolymer , polymer , electrolyte , lithium (medication) , solvent , polymer chemistry , alkoxy group , alkyl , chemical engineering , electrode , organic chemistry , chemistry , composite material , medicine , engineering , endocrinology
The development of solvent‐free low‐dimensional polymer electrolytes intended for use in solvent‐free lithium batteries operating at ambient or sub‐ambient temperatures is described. The synthetic routes to the amphiphilic polymers I having 5‐alkoxy‐3,4‐phenylene units connected with oligoethoxy segments via polyester–ether or pure polyether links (abbrev. CmOn, m = 12, 16, 18, n = 1–5) and to the copolymers CmO1–CmOn are described. The structures, thermal properties and SAXS long spacings of their complexes with lithium salts (type A) and with long chain n‐ alkane or alkyl side chain intercalation (type B) are discussed. However, high ambient conductivities (10 −4 –10 −3 S cm −1 ) are observed in type C systems when a second copolymer based on polytetramethylene oxide segments ( II ) is incorporated as a microphase between the lamellae of I and serving as an ion bridge or “glue”. DC polarization between Li electrodes also gives ambient conductivities ≥ca.10 −3 S cm −1 . In type D systems the I / II interface is stabilized by including a copolymer III , promoting high reproducibility in performance. Copolymers I of CmO1–CmO5 having CmO1 in excess give optimum conductivities with low temperature‐dependence. This, together with molecular modeling, suggests uncoupled ion mobilities by hopping between small aggregates in the interlamellar spaces. © 2004 The Japan Chemical Journal Forum and Wiley Periodicals, Inc. Chem Rec 4: 176–191; 2004: Published online in Wiley InterScience ( www.interscience.wiley.com ) DOI 10.1002/tcr.20012