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| MOF-derived nickel-cobalt bimetallic sulfide microspheres coated by carbon: Preparation and long cycling performance for sodium storage |
| Author Name | Affiliation | E-mail | | JU Zhicheng | College of Materials and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221000, China | | | FU Wenxuan | College of Materials and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221000, China | | | WANG Baoyan | College of Materials and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221000, China | | | LUO Ao | College of Materials and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221000, China | | | JIANG Jiangmin | College of Materials and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221000, China | | | SHI Yueli | College of Materials and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221000, China | | | CUI Yongli | College of Materials and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221000, China | 4018@cumt.edu.cn |
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| Abstract: Metal-organic framework (MOF)-based nickel-cobalt bimetallic sulfides microspheres were prepared by solvothermal and sulfurization methods, and trace nitrogen-doped carbon (NC)-coated Ni-Co-S@NC anode for sodium-ion batteries were further synthesized by high-temperature pyrolysis using dopamine hydrochloride as the organic carbon source. This surface modification can effectively improve the conductivity, structure, and interface stability of the synthesized materials, which helps to enhance the cycling stability of the materials, thereby improving the cycling stability and thermal stability. The Ni-Co-S@NC-0.5 anode with a carbon layer thickness of about 5 nm had an excellent long cycling performance with a 381.8 mAh·g-1 reversible capacity at 1 A·g-1 after 1 000 cycles, a capacity retention rate of 75.2%, and correspondingly the capacity decay per cycle was only 0.126 mAh·g-1. The Ni-Co-S@NC-0.5||NVP/C (NVP: Na3V2(PO4)3) full cell assembled had a reversible specific capacity of 386.2 mAh· g-1 with 88.6 % capacity retention at 1 A·g-1 after 100 cycles, and a stable Coulombic efficiency of 98.1%. It is found for the sodium ion dynamics behavior that the sodium storage mechanism of the Ni-Co-S@NC-0.5 anode is mainly controlled by pseudocapacitive behavior, indicating that the sodium ion storage process is more biased towards surface reactions, which is conducive to the shortening of the ion transport path and the realization of rapid sodium storage. The diffusion coefficients of sodium ions were between 10-11~10-13 cm2·s-1, and the charge transfer impedance value was a relatively minimum (36.7 Ω) of all. |
| Keywords: sodium ion battery carbon coating nickel-cobalt bimetallic sulfide porous microsphere sodium storage mechanism |
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| JU Zhicheng,FU Wenxuan,WANG Baoyan,LUO Ao,JIANG Jiangmin,SHI Yueli,CUI Yongli.MOF-derived nickel-cobalt bimetallic sulfide microspheres coated by carbon: Preparation and long cycling performance for sodium storage[J].Chinese Journal of Inorganic Chemistry,2025,41(4):661-674. |
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