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