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Storage and Transport Properties of Sodium-ions of Carbon-constraint NiS2 Nanostructure as Cathode for Na-S Batteries |
ZHOU Shuyu,JIN Xiaozhe,LIU jia,TIAN Ruixue,WU Aimin,HUANG Hao() |
Key Laboratory of Energy Materials and Devices (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China |
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Cite this article:
ZHOU Shuyu,JIN Xiaozhe,LIU jia,TIAN Ruixue,WU Aimin,HUANG Hao. Storage and Transport Properties of Sodium-ions of Carbon-constraint NiS2 Nanostructure as Cathode for Na-S Batteries. Chinese Journal of Materials Research, 2020, 34(3): 191-197.
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Abstract Carbon-constraint NiS2 nanomaterials (NiS2@C) with core-shell structure were successfully synthesized by a combination method of arc evaporation and solid-state vulcanization. Characterization results of X-ray diffraction (XRD), transmission electron microscopy (TEM) and Raman spectroscopy show that there existed rich defects in the carbon shell. The thickness of the carbon shell was 4 nm, and the diameter of the NiS2 core was 28 nm. The electrochemical performance of NiS2@C electrode was measured as the cathode materials for Na-S batteries. The Coulombic efficiency of NiS2@C electrode remained above 90% after four cycles at a current density of 100 mA·g-1, and the reversible specific capacity of 106.8 mAh·g-1 remained after 500 cycles, which showed high cyclic stability. The electrochemical impedance analysis reveals that the electrode reactions were accelerated and the dynamic equilibrium of ion migration at the interface was maintained due to its good electronic conductivity and excellent structural stability by the constraint of the external carbon layer.
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Received: 03 September 2019
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Fund: National Natural Science Foundation of China(51171033);Fundamental Research Funds for the Central Universities(DUT19LAB29) |
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