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Morphological evolution of hollow NiCo2O4 microspheres and their high pseudocapacitance contribution for Li/Na-ion battery anodes

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Abstract

Hollow urchin-like NiCo2O4 microspheres (∼3 μm) with a large specific surface area (158.57 m2 g−1) have been synthesized by a facile template-free hydrothermal method and a morphology evolution mechanism of “bundles-solid spheres-hollow urchin-like microspheres” was proposed. The hollow urchin-like structure appears when the hydrothermal time is increased to 8 h, which can be accelerated by the addition of excess urea. Benefiting from the unique three-dimensional (3D) hollow structure and the desired composition, the NiCo2O4 microspheres exhibit an excellent reversible specific capacity for lithium ion batteries (991 mA h g−1 after 50 cycles) and sodium ion batteries (322.3 mA h g−1 after 50 cycles). The unique 3D hollow structure offers enough space to alleviate volume expansion caused by the Li+/Na+ insertion/extraction, and the perfect electrical conductivity of spinel binary metal oxides facilitates the transport of ions and electrons. A high capacitance contribution of 90% was achieved for LIBs at 0.3 mV s−1, while the capacitance contributions for SIBs were only 36% at 0.3 mV s−1 and 73% even at 5 mV s−1, which indicates that a capacitive-controlled charge storage mechanism plays a dominant role in the Li+ storage of NiCo2O4 microspheres. This work has guiding significance in the preparation of electrode materials with high electrochemical performance.

Graphical abstract: Morphological evolution of hollow NiCo2O4 microspheres and their high pseudocapacitance contribution for Li/Na-ion battery anodes

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Publication details

The article was received on 06 Aug 2018, accepted on 27 Sep 2018 and first published on 27 Sep 2018


Article type: Paper
DOI: 10.1039/C8NJ03965H
Citation: New J. Chem., 2018, Advance Article
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    Morphological evolution of hollow NiCo2O4 microspheres and their high pseudocapacitance contribution for Li/Na-ion battery anodes

    K. Dong, Z. Wang, D. Wang, M. Sun, S. Luo and Y. Liu, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ03965H

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