Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 731, Issue -, Pages 1095-1102Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.10.148
Keywords
NiCo2O4@GO; Microspheres; Core-shell structure; High-performance anode material; Lithium-ion batteries
Categories
Funding
- Chinese National Natural Science Foundation [11474101, U1532139]
- South China University of Technology
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
- Ningbo Natural Science Foundation [2017A610059]
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In this study, a unique core-shell structural composite with graphene oxide nanosheets wrapping the hierarchical porous NiCo2O4 microspheres (NiCo2O4@GO) has been successfully prepared by a facile electrostatic assembly process between positively charged hierarchical porous NiCo2O4 microspheres and negatively charged graphene oxide (GO). When used as an anode for lithium-ion batteries (LIBs), the core-shell structured NiCo2O4@GO can not only suppress the aggregation and large volume change of NiCo2O4 microspheres, but also provide faster kinetics for both electrons and lithium ions during charge-discharge process. Moreover, NiCo2O4 microspheres wrapped with GO can restrict the decomposition of the electrolyte and yielding a stable solid electrolyte interphase (SEI) layer during cycling. Due to these merits, the core shell structured NiCo2O4@GO hybrid composite demonstrated a high initial reversible capacity of 1046.6 mAh g(-1) at a current density of 50 mA g(-1) with capacity retention of 77.6% after 100 cycles, the hybrid composite material can still deliver 387.4 mAh g(-1) even at a high current density of 4 A g(-1), significantly higher than 187.6 mAh g(-1) for the pure NiCo2O4 microspheres. The outstanding electrochemical performance of the core-shell NiCo2O4@GO hybrid composite demonstrated that it has great potential as high-performance anode material for lithium-ion batteries. (C) 2017 Elsevier B.V. All rights reserved.
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