Copper nanofiber-networked cobalt oxide composites for high performance Li-ion batteries

• Main Authors: Shim Hee-Sang, Nam Sang, Kim Yong, Kim Jong, Kim Won
• Format: Article
• Language: English
• Published: SpringerOpen 2011-01-01
• Series: Nanoscale Research Letters
• Online Access: http://www.nanoscalereslett.com/content/6/1/292

<p>Abstract</p> <p>We prepared a composite electrode structure consisting of copper nanofiber-networked cobalt oxide (CuNFs@CoO<it> _x </it>). The copper nanofibers (CuNFs) were fabricated on a substrate with formation of a network structure, which may have potential for improving electron percolation and retarding film deformation during the discharging/charging process over the electroactive cobalt oxide. Compared to bare CoO<it> _x </it>thin-film (CoO<it> _x </it>TF) electrodes, the CuNFs@CoO<it> _x </it>electrodes exhibited a significant enhancement of rate performance by at least six-fold at an input current density of 3C-rate. Such enhanced Li-ion storage performance may be associated with modified electrode structure at the nanoscale, improved charge transfer, and facile stress relaxation from the embedded CuNF network. Consequently, the CuNFs@CoO<it> _x </it>composite structure demonstrated here can be used as a promising high-performance electrode for Li-ion batteries.</p>