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Issue 39, 2017
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Hierarchical bilayered hybrid nanostructural arrays of NiCo2O4 micro-urchins and nanowires as a free-standing electrode with high loading for high-performance lithium-ion batteries

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Abstract

Fabrication of free -standing binary transition metal oxides, especially NiCo2O4, has attracted significant research interests since these metal oxides are promising candidates for free-standing anodes of lithium-ion batteries (LIBs). However, there remain some problems, especially low loading, for the existing NiCo2O4 anodes. To address the abovementioned issue, it will be a quite feasible solution to combine 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 proposed an effective method to controllably synthesize hierarchical bilayered hybrid nanostructural arrays of NiCo2O4(HNAs) micro-urchins and nanowires, denoted as NiCo2O4 HNAs/NF, based on Ni foam (NF) with a high loading via a simple surfactant-assisted hydrothermal and subsequent annealing treatment. In this synthesis, NF was applied as a Ni source for NiCo2O4 without the addition of other Ni-containing reagents, and the pH value played an important role in the synthesis of NiCo2O4 HNAs/NF. Furthermore, the reasonable reaction mechanism of NiCo2O4 HNAs/NF has been discussed in detail and proposed. The as-synthesized NiCo2O4 HNAs/NF possess unique structural advantages such as a large surface area, hierarchical porous structures, and robust connection of NFs and NiCo2O4 active materials. Thus, these unique NiCo2O4 HNAs/NF display excellent electrochemical performance such as a large reversible capacity of 1094 mA h g−1 at a current density of 500 mA g−1 and a good rate capability of 875 mA h g−1 at a large 1000 mA g−1. Especially, a high loading (7 mg cm−2) of NiCo2O4 HNAs/NF, which is much higher than those of other NiCo2O4 electrodes, is beneficial towards the achievement of lightweight and miniaturized LIBs.

Graphical abstract: Hierarchical bilayered hybrid nanostructural arrays of NiCo2O4 micro-urchins and nanowires as a free-standing electrode with high loading for high-performance lithium-ion batteries

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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, 2017,9, 14979-14989
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    Hierarchical bilayered hybrid nanostructural arrays of NiCo2O4 micro-urchins and nanowires as a 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, 9, 14979
    DOI: 10.1039/C7NR03979D

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