S-O bond chemically constrained NiS2/rGO nanocomposite with enhanced Na-ion storage capacity |
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| Institution: | 1. School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China;2. National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang 550025, China;3. School of Pharmaceutical Sciences, Guizhou University, Guiyang 550025, China;4. School of Pharmaceutical Sciences, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China;1. School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China;2. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China |
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| Abstract: | NiS2 has become a research hotspot of anode materials for Na-ion batteries due to its high theoretical specific capacity. However, the volume effect, the dissolution of polysulfide intermediates and the low conductivity during the charge/discharge process lead to the low specific capacity and poor cycling stability. NiS2/rGO nanocomposite was prepared by a facile two-step process: GO was prepared by modified Hummers method, and then NiS2/rGO nanocomposite was synthesized by l-cys assisted hydrothermal method. NiS2/rGO nanocomposite shows excellent cycle performance and rate performance, which could be attributed to the mesoporous structure on the graphene skeleton with high conductivity. Besides, the chemical constraint of a unique S O bond on NiS2 could inhibit the dissolution of intermediates and the loss of irreversible capacity. |
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| Keywords: | Na-ion batteries Hydrothermal reaction Anode Chemical constraint |
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