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.
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