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Multi-yolk-shell copper oxide@carbon octahedra as high-stability anodes for lithium-ion batteries
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chen, Tao Cheng, Baorui Chen, Renpeng Lv, Hongling Ma, Lianbo Zhu, Guoyin Wang, Yanrong Yan, Changzeng Tie, Zuoxiu Jin, Zhong |
| Copyright Year | 2016 |
| Abstract | Abstract 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. |
| Starting Page | 305 |
| Ending Page | 314 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.nanoen.2015.12.024 |
| Alternate Webpage(s) | http://hysz.nju.edu.cn/zhongjin/publications/52.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/j.nanoen.2015.12.024 |
| Volume Number | 20 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
