Journal
CARBON
Volume 133, Issue -, Pages 14-22Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.02.101
Keywords
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Funding
- National Natural Science Foundation of China [51572194, 51672189]
- Academic Innovation Funding of Tianjin Normal University [52XC1404]
- Training Plan of Leader Talent of University in Tianjin
- Fundamental Research Funds for the Central Universities [2652016114]
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Designing nanocomposite materials is an effective approach for enhancing the performance of sodium-ion batteries (SIBs), and understanding the synergy among components is critically important for new, better materials design. Herein, a directly reduced graphene oxide (RGO) decorated anode electrode was designed and tested for SIBs, in which uniform RGO coating onto the Ni3S2/Ni electrode was realized using facile hydrothermal reactions. The results indicate that the RGO/Ni3S2/Ni electrode delivers a high reversible specific capacity of 448.6 mAh g(-1), high capacity retention of 96.5% after 100 cycles, and excellent rate capability of 263.1mAh g(-1) at 800mA g(-1). Compared with the Ni3S2/Ni electrode, the improved performance of the RGO/Ni3S2/Ni electrode benefits from RGO-promoted displacement reaction of Ni3S2 with sodium. DFT calculations reveal that the RGO layer can significantly improve the electron mobility of the RGO/Ni3S2 + Na structure, and the hybrid interaction between the extraneous p orbits of C and indigenous p and d orbits of Ni, as well as p orbits of S is the major reason for why RGO can improve the electrical transport properties. (C) 2018 Elsevier Ltd. All rights reserved.
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