Weijie Zhu, Gaolei Wang, Shiqi Zhou, Yuxin Min, Chaofan Yang and Junjie Huang
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引用次数: 0
摘要
金属有机框架(MOFs)因其可调的三维多孔框架和大表面积而被视为锂离子电池(LIBs)中前景广阔的电极材料。然而,在氧化还原过程中,MOFs 中金属离子与有机配体之间的配位键很容易被破坏,从而导致结构断裂和电化学性能低下。本研究以氧化石墨烯(GO)为基质,通过羧基锚定 Ni2+,从而在表面原位形成 Ni-MOFs,有效提高了 Ni-MOFs 的结构稳定性。将 Ni-MOFs/GO 用作 LIB 的阳极时,在 50 mA g-1 的条件下,比容量可达 740.8 mA h g-1,并且在 100 个循环后几乎没有容量衰减。这种性能可归功于大 d-π 电子共轭,它不仅有助于快速的电子转移,还有利于电荷的分散。此外,GO 矩阵能有效防止 Ni-MOF 颗粒的团聚,这也有助于 Ni-MOF 在充放电过程中的结构稳定,从而提高 Ni-MOFs/GO 的电化学性能。
Excellent lithium storage performance of Ni-MOFs/GO composite as anode in lithium ion battery†
Metal–organic frameworks (MOFs) have been perceived as promising electrode materials in lithium ion batteries (LIBs) due to their tunable three-dimensional porous frameworks and large surface areas. However, the coordinate bonds between metallic ions and organic ligands in MOFs are easily broken during the redox process, resulting in structural breakage and poor electrochemical performance. In this study, graphene oxide (GO) has been applied as a matrix to anchor Ni2+ through carboxyl groups, thereby forming Ni-MOFs in situ on the surface and effectively enhancing the structural stability of Ni-MOFs. When used as an anode in an LIB, Ni-MOFs/GO can present a specific capacity of 740.8 mA h g−1 at 50 mA g−1 with almost no capacity degradation after 100 cycles. This performance can be attributed to the large d–π electron conjugation, which not only contributes to rapid electron transfer but also benefits the delocalization of charge. Additionally, the GO matrix can effectively prevent the agglomeration of Ni-MOF particles, which also aids the structural stabilization of Ni-MOFs in the charge/discharge process, thus enhancing the electrochemical performance of Ni-MOFs/GO.