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Journal of Nanomaterials
Volume 2010, Article ID 104012, 8 pages
http://dx.doi.org/10.1155/2010/104012
Research Article

Characterization of LiCo O 𝟐 Nanopowders Produced by Sol-Gel Processing

Department of Materials Science and Engineering, Sharif University of Technology, P.O. Box 11365-9466, Azadi Avenue, Tehran, Iran

Received 7 April 2010; Revised 21 July 2010; Accepted 11 September 2010

Academic Editor: Michael Wong

Copyright © 2010 Sina Soltanmohammad and Sirous Asgari. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

LiCo O 2 nanopowders, one of the most important cathode materials for lithium-ion batteries, were synthesized via a modified sol-gel process assisted with triethanolamine (TEA) as a complexing agent. The influence of three different chelating agents including acrylic acid, citric acid, and oxalic acid on the size and morphology of particles was investigated. Structure and morphology of the synthesized powders were characterized by thermogravimetric/differential thermal analyses (TG/DTA), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Results indicate that the powder processed with TEA and calcinated at 800 ∘ C had an excellent hexagonal ordering of 𝛼 -NaFe O 2 -type (space group R 3 m). Also, the other three complexing agents had a decisive influence on the particle size, shape, morphology, and degree of agglomeration of the resulting oxides. Based on the data presented in this work, it is proposed that the optimized size and distribution of LiCo O 2 powders may be achieved through sol-gel processing using TEA as a chelating agent.