Di-ureasil ormolytes doped with Mg2+ ions. Part 1: Morphological, thermal and electrochemical properties
authors Nunes, SC; Bermudez, VDZ; Silva, MM; Barros, S; Smith, MJ; Morales, E; Carlos, LD; Rocha, J
nationality International
journal SOLID STATE IONICS
author keywords sol-gel; di-ureasil; magnesium triflate; complex impedance; cyclic voltammetry
keywords GEL POLYMER ELECTROLYTE; ORGANICALLY MODIFIED SILICATES; STATE LITHIUM BATTERIES; HYBRID MATERIALS; MAGNESIUM TRIFLATE; CONDUCTING ORMOLYTES; POLY(ETHYLENE OXIDE); SYSTEMS; COMPLEXES; SALTS
abstract Poly(oxyethylene) (POE)/siloxane-based materials incorporating magnesium triflate (Mg(CF3SO3)(2)) were synthesized by the sol-gel process. The host Class II hybrid matrix (di-ureasil) employed is composed of a siliceous framework to which short POE chains are covalently bonded through urea linkages. Ormolytes with salt composition it (molar ratio of oxyethylene moieties per Mg2+ ion) ranging from infinity to 1 were investigated. The nanohybrid with n = 20, which is thermally stable up to 360 degrees C, exhibits the highest conductivity (e.g., approximately 4.0 x 10(-6) and 6.7 x 10(-5) S cm(-1) at 35 and 104 degrees C, respectively). The redox stability domain of this material spans from -3.0 to +2.0 V vs. Mg/Mg2+. (c) 2005 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0167-2738
year published 2005
volume 176
issue 17-18
beginning page 1591
ending page 1599
digital object identifier (doi) 10.1016/j.ssi.2005.04.013
web of science category Chemistry, Physical; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000230734200013
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