期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 820, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.153084
关键词
2D-MOF; Self-assembly; Surface defects; Carbon nanosheet; Li-Se
资金
- National Natural Science Foundation of China [51202150, 51272161]
- Foundation of the State Key Laboratory of Solidification Processing in NWPU [SKLSP201110]
- Shenzhen Basic Research Program [JCYJ20160422091418366]
Tailoring of carbon matrix with reasonable structures is considered to be an effective way to achieve excellent electrochemical performance of lithium-selenium batteries. For the first time, hierarchically porous carbon nanosheets with a fish-scale like surface morphology are prepared using self-assembled metal-organic frameworks (MOFs) as template and carbon source. The carbon nano-architecture has a large specific surface area and well-defined nanostructure. When evaluated as a cathode for lithium-selenium batteries, the carbon/selenium composite demonstrates high specific capacity and excellent cycling performance. At a current rate of 2 C, a discharge capacity of 311.8 mAh g(-1) is achieved after 200 cycles. Moreover, even at the current rate of 8 C, the charge-discharge efficiency is maintained at 99.9% after 1000 cycles. The enhanced electrochemical performance is closely related to their well-defined nanostructures, which not only provides stable electronic and ionic transfer channels, but also plays a key role as a strong absorbent to retain lithium polyselenides and accommodate volume variation during the charge-discharge process. Crown Copyright (C) 2019 Published by Elsevier B.V. All rights reserved.
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