| 碳包覆MOF基镍钴双金属硫化物微球的制备及其长循环储钠性能 | |
| MOF-derived nickel-cobalt bimetallic sulfide microspheres coated by carbon: Preparation and long cycling performance for sodium storage | |
| 摘要: 通过溶剂热并辅以硫化法制备了金属有机骨架(MOF)基镍钴双金属硫化物微球，并通过高温热解有机碳源盐酸多巴胺制备了痕量氮掺杂碳包覆(NC)的Ni-Co-S@NC钠离子电池负极材料。这种改性能够有效提高电极材料的导电性以及结构和界面的稳定性，从而提高材料的循环稳定性。其中表面包覆约5 nm碳层的Ni-Co-S@NC-0.5微球具有出色的长循环寿命，其在1A·g-1下循环1 000圈后，仍有381.8 mAh·g-1的放电比容量和75.2%的容量保持率，相应地每圈循环的容量衰减量仅为0.126mAh·g-1；Ni-Co-S@NC-0.5||NVP/C (NVP：Na3V2(PO4)3)钠离子全电池在1 A·g-1下经过100次循环后，可逆放电比容量为386.2mAh·g-1，容量保持率为88.6%，库仑效率稳定在98.1%左右。动力学研究表明，Ni-Co-S@NC-0.5的储钠过程以赝电容行为控制为主，钠离子扩散系数在10-11~10-13 cm2·s-1之间，同时具有相对小的电荷转移阻抗(36.7 Ω)。 | |
| 关键词: 钠离子电池 碳包覆 镍钴双金属硫化物 多孔微球 储钠机制 | |
| 基金项目: 国家自然科学基金(No.22209204，22279162，21975283)资助。 | |
| 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 | |
| 投稿时间：2024-10-10 修订日期：2025-02-17 | |
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| 鞠治成,付文轩,王保琰,罗澳,蒋江民,史月丽,崔永莉.碳包覆MOF基镍钴双金属硫化物微球的制备及其长循环储钠性能[J].无机化学学报,2025,41(4):661-674. | |
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