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Hollow Prism NiCo2S4 Linked with Interconnected Reduced Graphene Oxide as High Performance Anode Materials for Sodium and Lithium Ion Batteries

Abstract

A new type of hierarchical reduced graphene oxide wrapped NiCo2S4 composite composed of reduced graphene oxide (RGO) matrix and hollow prism NiCo2S4 with a typical size of 500-600 nm is developed and investigated as anode material for Li-ion and Na-ion storage. The hollow NiCo2S4 prisms consisting of interconnected nanoparticles possess a lot of pores, providing sufficient electrode/electrolyte contact area, as well as acting as cushion spaces for the huge volume changes during discharge-charge processes. The three dimensional RGO backboned matrix not only acts as a confinement layer to prevent the NiCo2S4 nanoparticles from aggregating during the material preparation, but also functions as a physical barrier to buffer the volume change effect during charge/discharge processes. As a consequence, the composite demonstrates excellent rate performance and cycling stability for both Li-ion and Na-ion storage. In particular, the RGO-NiCo2S4 anode exhibits an impressive reversible capacity of 903 mAh g-1 after 80 cycles at500 mA g-1and a high-rate capacity of 489.3mAh g-1 even at 1600 mA g-1 for Li-ion storage. Moreover, a reversible Na-ion storage capacity of 530.2 mAh g-1 with negligible fading is also achieved after 70 cycles at 50 mA g-1. When the current density increases to 800 mA g-1,the RGO-NiCo2S4 anode still obtain a discharge capacity of 220 mAh g-1.

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Publication details

The article was received on 20 Sep 2017, accepted on 29 Nov 2017 and first published on 01 Dec 2017


Article type: Paper
DOI: 10.1039/C7NJ03581K
Citation: New J. Chem., 2017, Accepted Manuscript
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    Hollow Prism NiCo2S4 Linked with Interconnected Reduced Graphene Oxide as High Performance Anode Materials for Sodium and Lithium Ion Batteries

    Z. Zhang, Z. Li and L. Yin, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03581K

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