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Hierarchical bilayered hybrid nanostructural arrays of NiCo2O4 microurchins and nanowires as free-standing electrode with high loading for high-performance lithium-ion batteries

Abstract

Fabricating free-standing binary transition metal oxides, especially NiCo2O4, has attracted abundant research interests as promising free-standing anodes of lithium-ion batteries (LIBs). However, there remain some problems for the existed NiCo2O4 anodes, especially the low loading. To address the above issue, it will become a quite feasible solution to connect the advantages of both hierarchical micro/nano-structures and free-standing electrodes to fabricate a free-standing hierarchical micro/nano-structural NiCo2O4 electrode. Herein, we propose an effective method to controllably synthesize hierarchical bilayered hybrid nanostructural arrays of NiCo2O4 (HNAs) microurchins and nanowires based on Ni foam (NF) with a high loading, which is denoted as NiCo2O4 HNAs/NF, via a simple surfactant-assisted hydrothermal and subsequent annealing treatment. In this synthesis, the NF is applied as Ni resource of NiCo2O4 without adding other Ni-included reagent, and the pH value plays an important role for the synthesis of NiCo2O4 HNAs/NF. Furthermore, the reasonable reaction mechanism of NiCo2O4 HNAs/NF is in detail discussed and proposed. The as-synthesized NiCo2O4 HNAs/NF possesses the unique structural advantages, such as large surface area, hierarchical porous structures and robust connection of NFs and NiCo2O4 active materials. So, this unique NiCo2O4 HNAs/NF displays the excellent electrochemical performance, such as a large reversible capacity of 1094 mA h g–1 at a current density of 500mA g–1 and a good rate capability of 875 mA h g–1 at a large 1000 mA g–1. Especially, the high loading (7 mg cm-2) of NiCo2O4 HNAs/NF, which is much higher than those of other NiCo2O4 electrodes, is beneficial to the lightweight and miniaturization of LIBs.

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Publication details

The article was received on 05 Jun 2017, accepted on 12 Sep 2017 and first published on 13 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR03979D
Citation: Nanoscale, 2017, Accepted Manuscript
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    Hierarchical bilayered hybrid nanostructural arrays of NiCo2O4 microurchins and nanowires as free-standing electrode with high loading for high-performance lithium-ion batteries

    Y. Wang, P. Liu, K. Zhu, J. Wang and J. Liu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03979D

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