In this report, we prepared cobalt oxide electrode that is composited with copper nanofiber network, and demonstrated that such embedded nanostructure is able to enhance electrical conductivity and mechanical stability for the CoO x electrode during repeated cyclings.įabrication of Cu nanofiber-embedded cobalt oxide composites Therefore, it is expected that the incorporation of highly conducting metal nanowires into cobalt oxide materials would be a promising way to increase electrical conductivity and mitigate the particle agglomeration of the cobalt oxide during Li-ion insertion/extraction. In addition, incorporation of metal into active material was found to increase the charge transfer in electrode materials along with facilitated Li-ion diffusion. Such highly conducting core-embedded nanostructure was capable of enhancing the electrochemical properties of the VO x electrodes even though the electroactive materials have high electrical resistance. proposed a core-shell nanorod array electrode, which consists of a metallic conducting core with a vanadium oxide (VO x) shell layer. In particular, nanostuctured electrode materials are expected to be well-suited for next-generation Li-ion batteries due to their substantially increased reaction area and facilitated charge carrier transport through shortened Li-ion diffusion paths. These approaches generally provide a facile electrochemical reaction route, high conductivity, and structural stability. To overcome these problems, several strategies that employ a secondary material, a chemically or physically prepared surface coating, size optimization, and fabrication of a nanostructure have been reported. In addition, severe volume expansion during discharge/charge process accelerates fading of the capacity, and electrical contact between the electrode material and current collector eventually fails. However, the cobalt oxides show large irreversible capacity and poor cycling performance caused by Li-alloying, agglomeration or growth of passivation layers. ![]() Cobalt oxide (CoO x) is a high-capacity electrode material for Li-ion batteries with a theoretical capacity of at least two times greater than that of graphite ( ca.
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