Journal
APPLIED SURFACE SCIENCE
Volume 531, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147290
Keywords
Metal-organic frameworks; Carbon nanofibers; 3D conductive network; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [51974081, 51774177, 51474060]
- Natural Science Foundation of Liaoning Province, China [2019-MS-129]
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The lithium storage performance of metal oxides often suffer rapid capacity fading and poor rate performance due to their huge volume expansion during repeated charge and discharge processes. Herein, a facile strategy was adopted for constructing a three-dimensional (3D) interconnected conductive network. Metal-organic frameworks (MOFs)-derived metal oxides (Fe2O3, ZnO) were inlayed in carbon nanofibers through electrospinning and subsequent carbonization processes. As lithium-ion storage materials, the MOFs-derived metal oxide composite nanofibers exhibited a high specific capacity and an excellent rate capability due to the unique structural characteristics of high electrical conductivity, additional Li-storage sites, and defined frameworks. The Fe2O3@ polyacrylonitrile (PAN) and ZnO@PAN composite nanofibers deliver high initial specific capacities of 1571.4 and 1053.8 mAh g(-1) at 50 mA g(-1), respectively. Moreover, Fe2O3@ PAN and ZnO@PAN composite nanofibers retained reversible specific capacities of 506.6 and 455.4 mAh g(-1) at 1000 mA g(-1) after 500 cycles, respectively. Additionally, the diffusion kinetics analysis indicated a relatively fast Li-ion diffusivity for the composite nanofibers.
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