Three-dimensional hierarchical wreath-like Co3O4@ TiO2 as an anode for lithium-ion batteries
| Autor: | Jianming Tao, Hong Lixun, Zhigao Huang, Guozhen Liu, Yingbin Lin, Yanmin Yang, Zhiya Lin, Chi Yubin, Xinguang Yuan |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering Metals and Alloys chemistry.chemical_element Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Anode Electron transfer Chemical engineering chemistry Mechanics of Materials Electric field Materials Chemistry Work function Lithium 0210 nano-technology Porosity |
| Zdroj: | Journal of Alloys and Compounds. 780:948-958 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.11.242 |
| Popis: | Wreath-like Co3O4 particles consisting of microplates are synthesized by a facile solvothermal method and subsequently surface-modified with TiO2 ultrathin layer using a low-temperature hydrolysis process. Comparing with pure Co3O4, Co3O4@TiO2 exhibits superior electrochemical performances in terms of reversible capacity, rate capability and cycling stability. Co3O4@TiO2 exhibits high reversible capacity of 813.0 mAhg−1 at 500 mAg−1 after 180 cycles while the pristine Co3O4 only has a discharge capacity of 512.5 mAhg−1. The filling of TiO2 nanoparticles in porous Co3O4 sheets and the TiO2-coating on Co3O4 surface, could effectively suppress large volume expansion of Co3O4 and consequently enhance structural stability during the Li-ion insertion/extraction processes. Analysis from the electrochemical measurements reveals that the improved performances should be attributed to reduced the charge-transfer resistance and enhanced Li-ion diffusion kinetics because of TiO2-coating. In addition, the reduced work function induced by TiO2-coating is helpful to facilitate electron transfer in composites. Moreover, the built-in electric field resulting from the difference in work function between Co3O4 and TiO2, would facilitate electron-transfer and Li-ion migration across heterojunction interfaces. |
| Databáze: | OpenAIRE |
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