Constructing hierarchical MnO2/Co3O4 heterostructure hollow spheres for high-performance Li-Ion batteries
| Autor: | Huiqiao Liu, Qingqing Han, Qiang-Shan Jing, Ke-Jing Huang, Kangzhe Cao, Wangyang Li, Jie Shu, Runtian Zheng, Zhang Zhang, Lifang Jiao |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment business.industry Layer by layer Energy Engineering and Power Technology Heterojunction 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Anode Ion Electrode Optoelectronics Electrical and Electronic Engineering Physical and Theoretical Chemistry Diffusion (business) 0210 nano-technology business |
| Zdroj: | Journal of Power Sources. 437:226904 |
| ISSN: | 0378-7753 |
| Popis: | Fabricating electrode with hierarchical heterostructure is an effective method to incorporate the merits of different active materials into an electrode with desired electrochemical performance. However, heterostructure electrodes constructed layer by layer may increase the ion diffusion distances inadvertently when used for alkali metal ion batteries, though the synergistic effects of the components are exhibited. In this work, Co3O4 nanocrystallines (about 5 nm) anchor on ultrathin MnO2 nanosheets, which assemble hierarchical heterostructure hollow spheres (named as MnO2/Co3O4). When used as LIBs anode, the different dimensions of the components in MnO2/Co3O4 make them accessible for the electrolyte synchronously, without enlarging the ion diffusion distance. Moreover, the unique hierarchical hollow structure mitigates the internal mechanical stress brought by the volume variations upon cycling, preventing the electrode collapse. Therefore, the as-prepared MnO2/Co3O4 electrode not only delivers a high reversible capacity of 1209.0 mAh g−1 at 0.4 A g −1 over 300 cycles, but also exhibits long cyclic stability (a capacity of 581.8 mAh g−1 at 2.0 A g−1 after 1100 cycles). This work could provide new insight into heterostructure materials for batteries. |
| Databáze: | OpenAIRE |
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