基于金属有机框架衍生的多孔尖晶石 AFe2O4 空心结构及其优异的储锂性能的一般方法。

General Approach for MOF-Derived Porous Spinel AFe2O4 Hollow Structures and Their Superior Lithium Storage Properties.

机构信息

School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798.

TUM CREATE Limited 1 CREATE Way, #10-02 CREATE Tower, Singapore 138602.

出版信息

ACS Appl Mater Interfaces. 2015 Dec 9;7(48):26751-7. doi: 10.1021/acsami.5b08741. Epub 2015 Nov 25.

DOI:10.1021/acsami.5b08741

PMID:26572743

Abstract

A general and simple approach for large-scale synthesis of porous hollow spinel AFe2O4 nanoarchitectures via metal organic framework self-sacrificial template strategy is proposed. By employing this method, we can successfully synthesize uniform NiFe2O4, ZnFe2O4, and CoFe2O4 hollow architectures that are hierarchically assembled by nanoparticles. When these hollow microcubes were tested as anode for lithium ion batteries, good rate capability and long-term cycling stability can be achieved. For example, high specific capacities of 636, 449, and 380 mA h g(-1) were depicted by NiFe2O4, ZnFe2O4, and CoFe2O4, respectively, at a high current density of 8.0 A g(-1). NiFe2O4 exhibits high specific capacities of 841 and 447 mA h g(-1) during the 100th cycle when it was tested at current densities of 1.0 and 5.0 A g(-1), respectively. Discharge capacities of 390 and 290 mA h g(-1) were delivered by the ZnFe2O4 and CoFe2O4, respectively, during the 100th cycle at 5.0 A g(-1).

摘要

提出了一种通过金属有机框架自牺牲模板策略大规模合成多孔空心尖晶石 AFe2O4 纳米结构的通用且简单的方法。通过该方法，可以成功合成由纳米颗粒分级组装的均匀的 NiFe2O4、ZnFe2O4 和 CoFe2O4 空心结构。当将这些空心微立方体用作锂离子电池的阳极时，可以实现良好的倍率性能和长期循环稳定性。例如，NiFe2O4、ZnFe2O4 和 CoFe2O4 在 8.0 A g-1 的高电流密度下分别表现出 636、449 和 380 mA h g-1 的高比容量。当在 1.0 和 5.0 A g-1 的电流密度下测试时，NiFe2O4 在第 100 次循环时分别具有 841 和 447 mA h g-1 的高比容量。在 5.0 A g-1 下，ZnFe2O4 和 CoFe2O4 在第 100 次循环时分别提供 390 和 290 mA h g-1 的放电容量。