Multi-yolk-shell copper oxide@carbon octahedra as high-stability anodes for lithium-ion batteries
| Autor: | Renpeng Chen, Yanrong Wang, Tao Chen, Lianbo Ma, Guoyin Zhu, Baorui Cheng, Yi Hu, Zhong Jin, Hongling Lv, Zuoxiu Tie, Changzeng Yan, Jie Liu |
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| Rok vydání: | 2016 |
| Předmět: |
Copper oxide
Materials science Renewable Energy Sustainability and the Environment Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Anode chemistry.chemical_compound chemistry Transition metal General Materials Science Metal-organic framework Lithium Electrical and Electronic Engineering 0210 nano-technology Carbon Faraday efficiency |
| Zdroj: | Nano Energy. 20:305-314 |
| ISSN: | 2211-2855 |
| DOI: | 10.1016/j.nanoen.2015.12.024 |
| Popis: | Although transition metal oxides have attracted considerable attention for their high energy density as anode materials of lithium-ion batteries, they suffer from large volume expansion during lithiation process, which usually causes fast capacity degradation. Herein, we report a rational design and facile preparation strategy of copper oxide encapsulated mesoporous carbon multi-yolk-shell octahedra, in which multiple CuO nanoparticles are well-confined in the compartments of micro-scale octahedral carbon scaffolds. The advantages of the novel multi-yolk-shell design are that the three-dimensional carbon scaffolds can buffer the volume change and prevent aggregation of CuO nanoparticles during the charge/discharge cycles, provide pathways for electron transport and Li + diffusion, and restrict the thin solid-electrolyte interphase layer to the outer surface of carbon shells. The results demonstrate how the electrochemical properties of anodes can be significantly improved by the multi-yolk-shell nanostructures with greatly enhanced structural stability and electrochemical actuation. Moreover, the micrometer-size CuO@C octahedra reduce the relative quality of SEI, resulting in high Coulombic efficiency and long cycling stability. In Li-ion cells, the CuO@C multi-yolk-shell octahedra anodes deliver a highly-reversible capacity of 598 mA h g −1 at 250 mA g −1 , excellent rate capacity of 365 mA h g −1 at 3000 mA g −1 and exhibit long-term cyclability with a capacity of 512 mA h g −1 after 300 cycles at 500 mA g −1 . |
| Databáze: | OpenAIRE |
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