title: Copper nanofiber-networked cobalt oxide composites for high performance Li-ion batteries.
abstract: We prepared a composite electrode structure consisting of copper nanofiber-networked cobalt oxide (CuNFs@CoOx). 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 CoOxthin-film (CoOxTF) electrodes, the CuNFs@CoOxelectrodes 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@CoOxcomposite structure demonstrated here can be used as a promising high-performance electrode for Li-ion batteries.
authors.affiliation: School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Chemdan-gwagiro, Buk-gu, Gwangju 500-712, South Korea. wbkim@gist.ac.kr.
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Nam
authors.forename: Yong Seok
authors.initials: YS
authors.lastname: Kim
authors.forename: Hee-Sang
authors.initials: HS
authors.lastname: Shim
authors.forename: Jong Guk
authors.initials: JG
authors.lastname: Kim
authors.forename: Won
authors.initials: W
authors.lastname: Bae Kim