Preparation, characterization and properties of new ion-conducting ORMOLYTES

Book · Tue Dec 31 00:00:00 EST 1996

OSTI ID:427716

Dahmouche, K; Atik, M; Mello, N C; Bonagamba, T J; Panepucci, H ^[1]; Aegerter, M ^[2]; Judeinstein, P ^[3]

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1. Univ. de Sao Paulo, Sao Carlos, Sao Paulo (Brazil). Inst. de Fisica
2. Inst. fuer Neue Materialen, Saarbruecken (Germany)
3. Univ. Paris-Sud, Orsay (France). Lab. de Chimie Structurale Organique

Two families of hybrid organic-inorganic composites exhibiting ionic conduction properties, so called ORMOLYTES (organically modified electrolytes), have been prepared by the sol-gel process. The first family has been prepared for a mixture of 3-isocyanatopropyltriethoxysilane (IsoTrEOS), O,O{prime} Bis (2-aminopropyl)polyethyleneglycol and lithium salt. These materials present chemical bonds between the organic (polymer) and the inorganic (silica) phases. The second family has been prepared by an ultrasonic method from a mixture of tetraethoxysilane (TEOS), polyethyleneglycol and lithium salt. The organic and inorganic phases are not chemically bonded. The Li{sup +} ionic conductivity has been studied by AC impedance spectroscopy up to 100 C. Values of {sigma} up to 10{sup {minus}4} Scm{sup {minus}1} have been found at room temperature. The conduction properties have been related to the materials structure using linewidth and relaxation times NMR measurements of {sup 7}Li between {minus}100 C and 90 C. A systematic study has been done changing the lithium concentration, the polymer chain length and the polymer to silica weight ratio. The structures and the ionic conduction properties of both families are compared with emphasis on the nature of the bonds between the organic and inorganic components.

• Sponsoring Organization: Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP), SP (Brazil); Financiadora de Estudos e Projectos (FINEP) (Brazil); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Sao Paulo, SP (Brazil); Fundacao Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) (Brazil)
• OSTI ID: 427716
• Report Number(s): CONF-960401-; ISBN 1-55899-338-X; TRN: IM9708%%42
• Resource Relation: Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996; Other Information: PBD: 1996; Related Information: Is Part Of Better ceramics through chemistry 7: Organic/inorganic hybrid materials; Coltrain, B.K. [ed.] [Eastman Kodak Co., Rochester, NY (United States)]; Sanchez, C. [ed.] [Univ. Pierre et Marie Curie, Paris (France)]; Schaefer, D.W. [ed.] [Sandia National Labs., Albuquerque, NM (United States)]; Wilkes, G.L. [ed.] [Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States)]; PB: 695 p.; Materials Research Society symposium proceedings, Volume 435
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
25 ENERGY STORAGE
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
COMPOSITE MATERIALS
SOL-GEL PROCESS
MOLECULAR STRUCTURE
IONIC CONDUCTIVITY
POLYETHYLENE GLYCOLS
SILICA
LITHIUM PERCHLORATES
ELECTRIC BATTERIES
SOLID ELECTROLYTES
ELECTRONIC EQUIPMENT
SILANES
HYDROLYSIS
CHEMICAL BONDS
ULTRASONIC WAVES
NUCLEAR MAGNETIC RESONANCE
MOBILITY
TEMPERATURE DEPENDENCE
ACTIVATION ENERGY
CHEMICAL COMPOSITION
EXPERIMENTAL DATA