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Journal of Nanomaterials
Volume 2014, Article ID 586241, 7 pages
http://dx.doi.org/10.1155/2014/586241
Research Article

Carbon Nanotube/Nanofibers and Graphite Hybrids for Li-Ion Battery Application

1Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
2Department of Applied Physics, Aalto University School of Science, P.O. Box 15100, Puumiehenkuja 2, 00076 Espoo, Finland
3Toyota Central Research and Development Laboratories, Inc., 41-1 Nagakute Yokomichi, Aichi 480-1192, Japan
4Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
5Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan

Received 4 November 2013; Revised 9 February 2014; Accepted 9 February 2014; Published 12 March 2014

Academic Editor: Xuedong Bai

Copyright © 2014 Yosuke Nomura 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

To improve the electrical conductivity of negative electrodes of lithium ion batteries, we applied a direct CVD synthesis of carbon nanomaterials on the surface of graphite particles. To prepare a catalyst, two alternative approaches were utilized: colloidal nanoparticles (NPs) and metal (Ni and Co) nitrate salt precursors deposited on the graphite surface. Both colloidal and precursor systems allowed us to produce carbon nanofibers (CNFs) on the graphite surface with high coverage under the optimum CVD conditions. Electrical measurements revealed that the resistivity of the actual electrodes fabricated from CNFs coated graphite particles was about 40% lower compared to the original pristine graphite electrodes.