MOF-derived Zn–Mn mixed oxides@carbon hollow disks with robust hierarchical structure for high-performance lithium-ion batteries
| Autor: | Jinjue Zeng, Guangwu Wen, Chunyan Ding, Dong Wang, Xiaoxiao Huang, Weiwei Zhou, Yanfang Mao, Rui Zhang, Jinping Liu, Jian Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Oxide Nanoparticle chemistry.chemical_element 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences law.invention Metal chemistry.chemical_compound law General Materials Science Renewable Energy Sustainability and the Environment General Chemistry 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Anode chemistry Chemical engineering visual_art visual_art.visual_art_medium Lithium 0210 nano-technology Carbon |
| Zdroj: | Journal of Materials Chemistry A. 6:2974-2983 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c7ta10154f |
| Popis: | Hollow metal oxides and carbon hybrids with hierarchical and robust nanoarchitecture hold great potential as high-performance electrode materials. Herein, a relatively unexplored hollow and hierarchical metal–organic framework (MOF) assembled by parallel stacked triangular sub-MOFs were successfully synthesized via a facile co-precipitation method. The hollow MOFs were then converted to binary metal oxides@carbon composites, exemplified herein as Zn–Mn mixed oxides@carbon (ZnxMnO@C) hybrids. The obtained ZnxMnO@C inherits the unique hollow hexagonal nanodisks (HHNDs) structure of the MOF precursor, and each triangular plate-like subunit consists of a continuous carbon matrix embedded uniformly within the ultrafine ZnxMnO nanoparticles. When evaluated as an anode material for lithium ion batteries, the ZnxMnO@C HHNDs exhibited high specific capacity (1050 mA h g−1 at 0.1 A g−1 after 200 cycles) and remarkable cycling performance up to 1000 cycles. It is believed that besides the protection of the carbon matrix, the unique hierarchically hollow structure with parallel stacked subunits endows the ZnxMnO@C hybrid with additional capability to withstand lithiation/delithiation strain. Moreover, kinetics-analysis based on cyclic voltammograms (CVs) reveals that the high lithium storage capacity is primarily attributed to fast kinetics originating from pseudocapacitive contribution. This also accounts for the good rate capabilities of ZnxMnO@C HHNDs (713 and 330 mA h g−1 at 1 and 10 A g−1, respectively). Furthermore, full cells with Zn0.5MnO@C anodes and LiMn2O4 cathodes are assembled and show good cycling stability over 120 cycles. This study demonstrates a new hollow structure of MOFs and its usefulness in developing robust and hierarchical metal oxide/carbon composites for electrochemical storage applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|