School of Metallurgy and Environment, Central South University , Changsha 410083, China.
ACS Appl Mater Interfaces. 2017 Apr 26;9(16):14309-14318. doi: 10.1021/acsami.7b04584. Epub 2017 Apr 13.
A facile process is developed to prepare SnO-based composites through using metal-organic frameworks (MOFs) as precursors. The nitrogen-doped graphene wrapped okra-like SnO composites (SnO@N-RGO) are successfully synthesized for the first time by using Sn-based metal-organic frameworks (Sn-MOF) as precursors. When utilized as an anode material for lithium-ion batteries, the SnO@N-RGO composites possess a remarkably superior reversible capacity of 1041 mA h g at a constant current of 200 mA g after 180 charge-discharge processes and excellent rate capability. The excellent performance can be primarily ascribed to the unique structure of 1D okra-like SnO in SnO@N-RGO which are actually composed of a great number of SnO primary crystallites and numerous well-defined internal voids, can effectively alleviate the huge volume change of SnO, and facilitate the transport and storage of lithium ions. Besides, the structural stability acquires further improvement when the okra-like SnO are wrapped by N-doped graphene. Similarly, this synthetic strategy can be employed to synthesize other high-capacity metal-oxide-based composites starting from various metal-organic frameworks, exhibiting promising application in novel electrode material field of lithium-ion batteries.
一种简便的方法是通过使用金属有机骨架（MOFs）作为前体制备基于 SnO 的复合材料。首次通过使用基于 Sn 的金属有机骨架（Sn-MOF）作为前体制备了氮掺杂石墨烯包裹的蕌状 SnO 复合材料（SnO@N-RGO）。当用作锂离子电池的阳极材料时，SnO@N-RGO 复合材料在 200 mA g 的恒定电流下经过 180 次充放电循环后具有高达 1041 mA h g 的卓越可逆容量和出色的倍率性能。优异的性能主要归因于 SnO@N-RGO 中独特的 1D 蕌状 SnO 结构，它实际上由大量 SnO 初级微晶和许多明确定义的内部空隙组成，可有效减轻 SnO 的巨大体积变化，并促进锂离子的传输和存储。此外，当蕌状 SnO 被氮掺杂石墨烯包裹时，结构稳定性得到进一步提高。同样，这种合成策略可以用于从各种金属有机骨架合成其他高容量金属氧化物基复合材料，在锂离子电池新型电极材料领域具有广阔的应用前景。
