Metal鈥揙rganic Frameworks Derived Porous Core/Shell Structured ZnO/ZnCo2O4/C Hybrids as Anodes for High-Performance Lithium-Ion Battery

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• 作者：Xiaoli Ge ; Zhaoqiang Li ; Chengxiang Wang ; Longwei Yin
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：7
• 期：48
• 页码：26633-26642
• 全文大小：695K
• ISSN：1944-8252

文摘

Metal鈥搊rganic frameworks (MOFs) derived porous core/shell ZnO/ZnCo₂O₄/C hybrids with ZnO as a core and ZnCo₂O₄ as a shell are for the first time fabricated by using core/shell ZnCo-MOF precursors as reactant templates. The unique MOFs-derived core/shell structured ZnO/ZnCo₂O₄/C hybrids are assembled from nanoparticles of ZnO and ZnCo₂O₄, with homogeneous carbon layers coated on the surface of the ZnCo₂O₄ shell. When acting as anode materials for lithium-ion batteries (LIBs), the MOFs-derived porous ZnO/ZnCo₂O₄/C anodes exhibit outstanding cycling stability, high Coulombic efficiency, and remarkable rate capability. The excellent electrochemical performance of the ZnO/ZnCo₂O₄/C LIB anodes can be attributed to the synergistic effect of the porous structure of the MOFs-derived core/shell ZnO/ZnCo₂O₄/C and homogeneous carbon layer coating on the surface of the ZnCo₂O₄ shells. The hierarchically porous core/shell structure offers abundant active sites, enhances the electrode/electrolyte contact area, provides abundant channels for electrolyte penetration, and also alleviates the structure decomposition induced by Li⁺ insertion/extraction. The carbon layers effectively improve the conductivity of the hybrids and thus enhance the electron transfer rate, efficiently prevent ZnCo₂O₄ from aggregation and disintegration, and partially buffer the stress induced by the volume change during cycles. This strategy may shed light on designing new MOF-based hybrid electrodes for energy storage and conversion devices.