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Sol-Gel Non-hydrolytic Synthesis of a Nanocomposite Electrolyte for Application in Lithium-ion Devices

Published online by Cambridge University Press:  03 September 2012

Flávio L. Souza ,
Paulo R. Bueno ,
Ronaldo C. Faria ,
Elson Longo  and
Edson R. Leite
Flávio L. Souza
Affiliation:
PPGCEM - Department of Materials Science and Engineering, Federal University of São Carlos, C. Postal 676, 13565-905 - São Carlos, SP, Brazil
Paulo R. Bueno
Affiliation:
FFCLRP - Department of Physics, University of São Paulo, Av. Bandeirantes, 14.040-901 - Ribeirão Preto, SP, Brazil
Ronaldo C. Faria
Affiliation:
FFCLRP - Department of Physics, University of São Paulo, Av. Bandeirantes, 14.040-901 - Ribeirão Preto, SP, Brazil
Elson Longo
Affiliation:
CMDMC - Department of Chemistry, Federal University of São Carlos, C. Postal 676, 13565-905 - São Carlos, SP, Brazil
Edson R. Leite
Affiliation:
PPGCEM - Department of Materials Science and Engineering, Federal University of São Carlos, C. Postal 676, 13565-905 - São Carlos, SP, Brazil CMDMC - Department of Chemistry, Federal University of São Carlos, C. Postal 676, 13565-905 - São Carlos, SP, Brazil
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Abstract

A new nanocomposite electrolyte was synthesized using a simple non-hydrolytic sol-gel route without specific treatment of the reagents. The nanocomposite ion conductor was prepared with citric acid, tetraethyl orthosilicate and ethylene glycol, forming polyester chains. The time-consuming drying step that is a necessary part of most chemical syntheses was not required in the preparation of the present nanocomposite electrolyte of the polyelectrolyte class, because only Li+ is mobile in the polymeric chain. The effects of the concentration of Li, SiO 2 and SnO2nanoparticles were investigated in terms of Li+ ionic conductivity. Conductivity measurements as a function of the metal oxide nanocrystal content in the nanocomposite revealed a significant increase in conductivity at approximately 5 and 10 wt % of nanoparticles. The new nanocomposite conductor proved to be fully amorphous at room temperature, with a vitreous transition temperature of approximately 228K (−45°C). The material is solid and transparent, displaying an ionic conductivity of 10−4to 10−5 (O.cm)−1at room temperature presenting excellent reproducibility of all these characteristics. Cyclic voltammetry measurements indicate that the hybrid electrolyte possesses outstanding electrochemical stability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 822: Symposium S – Nanostructured Materials in Alternative Energy Devices , 2004 , S3.1
Copyright
Copyright © Materials Research Society 2004

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