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Journal of Nanomaterials
Volume 2014, Article ID 378103, 8 pages
http://dx.doi.org/10.1155/2014/378103
Research Article

Synthesis of Nanocobalt Powders for an Anode Material of Lithium-Ion Batteries by Chemical Reduction and Carbon Coating

1Powder Technology Group, Korea Institute of Materials and Science (KIMS), Affiliated with Korea Institute of Machinery and Materials, 797 Changwon-daero, Seongsan-gu, Changwon, Gyeongsangnam-do 642-831, Republic of Korea
2Hwa Sung Thermo Co., Ltd., 40 Sandan-ro, 197 Beon-gil, Pyeongtaek-si, Gyeonggi-do 459-050, Republic of Korea
3Functional Ceramics Group, Korea Institute of Materials and Science (KIMS), Affiliated with Korea Institute of Machinery and Materials, 797 Changwon-daero, Seongsan-gu, Changwon, Gyeongsangnam-do 642-831, Republic of Korea
4Division of Advanced Materials Engineering, Research Center of Advanced Materials Development, Engineering Research Institute, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 561-756, Republic of Korea

Received 25 October 2013; Revised 30 March 2014; Accepted 1 April 2014; Published 19 May 2014

Academic Editor: Necdet Aslan

Copyright © 2014 Seong-Hyeon Hong et al. 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

Nanosized Co powders were prepared by a chemical reduction method with and without CTAB (cetyltrimethylammonium bromide, ) and carbon-coating heat treatment at 700°C for 1 h, and the electrochemical properties of the prepared nanosized Co powders were examined to evaluate their suitability as an anode material of Li-ion batteries. Nanosized amorphous Co-based powders could be synthesized by a chemical reduction method in which a reducing agent is added to a Co ion-dissolved aqueous solution. When the prepared nanosized Co-based powders were subjected to carbon-coating heat treatment at 700°C for 1 h, the amorphous phase was crystallized, and a Co single phase could be obtained. The Co-based powder prepared by chemical reduction with CTAB and carbon-coating heat treatment had a smaller first discharge capacity (about 557 mAh/g) than the Co-based powder prepared by chemical reduction without CTAB and carbon-coating heat treatment (about 628 mAh/g). However, the former had a better cycling performance than the latter from the third cycle. The carbon-coated layers are believed to have led to quite good cycling performances of the prepared Co-based powders from the third cycle.