Hierarchical Porous Te@ZnCo₂O₄ Nanofibers Derived from Te@Metal-Organic Frameworks for Superior Lithium Storage Capability

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• 作者：Gang Huang ; Qian Li ; Dongming Yin and Limin Wang
• 刊名：Advanced Functional Materials
• 出版年：2017
• 出版时间：February 3, 2017
• 年：2017
• 卷：27
• 期：5
• 全文大小：1898K
• ISSN：1616-3028

文摘

1D hierarchical porous nanocomposites with tailored chemical composition are gaining popularity in lithium-ion batteries. Here, with core@shell Te@ZIF-8 (Zn, Co) nanofibers as a starting point, rational designed porous Te@ZnCo₂O₄ nanocomposite has been fabricated by a simple morphology-maintained and calcination-induced oxidative decomposition process, with the purpose of simultaneously settling the pulverization and conductivity issues of transition metal oxides. This is the first time to integrate Te and ZnCo₂O₄ into one architecture at nanometer level. The Te@ZnCo₂O₄ nanofibers combine both advantages of Te such as excellent electrical conductivity and ZnCo₂O₄ with high capacity as well as take full use of their synergistic effect. With the favorable 1D porous structure and the unique composition, this novel Te@ZnCo₂O₄ nanofiber manifests strong ability to improve the lithium storage performances with a high specific capacity of 1364 mA h g⁻¹ in the initial discharge and a reversible capacity of 956 mA h g⁻¹ after 100 cycles. When increased the current density to 2000 mA g⁻¹, the capacity still remains as 307 mA h g⁻¹, demonstrating superior rate capability. Furthermore, this general strategy can be extended to construct other core@shell Te@MOFs composites.