具有微纳米结构的多孔 MnF2 涂有氮掺杂碳壳作为增强锂存储的阳极,Applied Surface Science

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具有微纳米结构的多孔 MnF2 涂有氮掺杂碳壳作为增强锂存储的阳极
Applied Surface Science ( IF 6.3 ) Pub Date : 2024-01-06 , DOI: 10.1016/j.apsusc.2024.159323
Shengfan Fang , Junhui Pei , Liping Guo , Yanmin Qin

MnF 是一种有趣的锂离子电池（LIB）负极材料，由于其高理论容量而引起了广泛关注。然而，其商业可行性受到体积膨胀和导电性差等问题的阻碍。在这项研究中，我们展示了具有微纳米结构孔的 MnF@NC 微球的开发和制造，该微球包含封装在氮掺杂碳壳内的 MnF 纳米颗粒。这是通过水热合成和氟化技术的结合实现的。 MnF@NC复合材料表现出高水平的孔隙率，有效减轻了MnF的显着体积膨胀并促进有效的电荷传输。此外，氮掺杂碳壳的加入增强了整体结构并提高了导电性。利用这些固有特性，MnF@NC 电极表现出卓越的导电性和卓越的长期稳定性。 MnF@NC电极作为LIB的阳极，在0.1 A/g下表现出991.2 mAh/g的显着可逆容量，在1.0 A/g下表现出出色的循环性能，700次循环后容量保持率为872.2 mAh/g，出色的倍率性能超过了 MnF 基复合阳极的报告结果。这些结果明确证明了 MnF@NC 作为高容量锂离子电池负极的适用性和潜在应用性。

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Porous MnF2 with micro-nanostructures coated by a nitrogen doped carbon shell as an anode for enhanced lithium storage

MnF, an intriguing anode material for lithium-ion batteries (LIBs), has garnered significant attention due to its high theoretical capacity. However, its commercial viability is impeded by issues such as volume expansion and poor conductivity. In this study, we present the development and fabrication of MnF@NC microspheres with micro-nanostructured pores, comprising MnF nanoparticles encapsulated within a nitrogen-doped carbon shell. This was achieved through a combination of hydrothermal synthesis and fluorination techniques. The MnF@NC composite exhibits a high level of porosity, effectively mitigating the significant volume expansion of MnF and facilitating efficient charge transport. Moreover, the incorporation of nitrogen-doped carbon shell enhances the overall structural and promotes electrical conductivity. Leveraging these inherent characteristics, the MnF@NC electrode demonstrates exceptional electrical conductivity and superior long-term stability. The MnF@NC electrode serves as an anode for LIBs, exhibiting a remarkable reversible capacity of 991.2 mAh/g at 0.1 A/g, exceptional cycle performance with a capacity retention of 872.2 mAh/g after 700 cycles at 1.0 A/g, and outstanding rate capability surpassing the reported outcomes of MnF-based composite anodes. These results unequivocally demonstrate the suitability and potential applicability of MnF@NC as high-capacity anodes for LIB.

更新日期：2024-01-06

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