Abstract
In this paper, ZnCo2O4 nanowire arrays with a uniform carbon coating were introduced when polyvinyl alcohol (PVA) served as the carbon source. The coating process was completed by a facile bath method in PVA aqueous solution and subsequent pyrolyzation. The PVA-derived carbon-coated ZnCo2O4 nanowire array composites can be used directly as the binder-free and self-supported anode materials for lithium-ion batteries. In the carbon-coated ZnCo2O4 composites, the carbon layer carbonized from PVA can accelerate the electron transfer and accommodate the volume swing during the cycling process. The lithium storage properties of the carbon-coated ZnCo2O4 composites are investigated. It is believed that the novel carbon-coating method is universal and can be applied to other nanoarray materials.
Highlights
Nowadays, a variety of electric vehicles and portable electronic devices have been widely applied and developed rapidly in the world
We present a novel and facile in situ bath method in polyvinyl alcohol (PVA)
The X-ray diffraction (XRD) patterns of the ZnCo2 O4 and carbon-coated ZnCo2 O4 samples have been shown in Figure 1a and Figure 1b, respectively
Summary
A variety of electric vehicles and portable electronic devices (mobile phones, laptops, etc.) have been widely applied and developed rapidly in the world. Recent research indicates that the free-standing nanoarray construction of electrode materials can effectively shorten the transport path of electrons and ions, alleviate the volume swings caused by the repeated ion insertion/extraction, as well as avoid the use of additional binder and conductive agent These nanoarray electrodes displayed outstanding cycling stability and rate performance [17,18,19,20,21,22,23]. An amorphous carbon layer has been deposited onto the surface of the NiCo2 O4 nanowires through the physical vapor deposition technique, further improving the conductivity and structural stability of the materials [24] Wang and his co-workers at Tianjin University reported free-standing electrode of Fe2 O3 nanorods grown on the carbon fiber. Our work of the novel carbon-coating method has versatility and can be used to optimize the electrochemical performance of other electrode materials
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