Abstract
Ca3Co4O9 anodes have been intensively investigated due to its high safety and excellent cycling stability. In comparison to the pure Ca3Co4O9, the 9 wt% MWCNTs/Ca3Co4O9 nanocomposite anode exhibited a favorable reversible capacity of 526.6 mAh/g and the excellent charge/discharge capacities of 524.7/507.5 mAh/g after 100th cycles were obtained due to epoxy groups anchoring and the construction of conductive network. The Coulombic efficiencies of all samples were maintained as high as 90 %. More importantly, a continuous three-dimensional (3D) long-range conductive network shortened transport channels for ions/electrons and enhanced the ionic/electronic conductivity. The interfacial resistance (Rs) value of 2.8 Ω was obtained for the 9 wt% MWCNTs/Ca3Co4O9. The improved electrochemical properties of the nanocomposites were attributed to the incorporation of epoxy groups anchoring and much Li+ active sites offering. This novelty route is attractive alternative method for preparing oxides anode materials, which is beneficial to the large capacity and outstanding cycling stability for the applications of high-power Li-ion batteries.
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