期刊
SMALL
卷 14, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201703252
关键词
electrospinning; multichannel carbon nanofibers; Na-Se batteries; Se
类别
资金
- National Key R&D program of China [2016YFB0100305]
- National Natural Science Foundation of China [21373195, 51674228, 51622210]
- Fundamental Research Funds for the Central Universities [WK3430000004, WK2320000034]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Youth Innovation Promotion Association CAS [2013286]
Selenium cathode has attracted more and more attention because of its comparable volumetric capacity but much higher electrical conductivity than sulfur cathode. Compared to Li-Se batteries, Na-Se batteries show many advantages, including the low cost of sodium resources and high volumetric capacity. However, Na-Se batteries still suffer from the shuttle effect of polyselenides and high volumetric expansion, resulting in the poor electrochemical performance. Herein, Se is impregnated into microporous multichannel carbon nanofibers (Se@MCNFs) thin film with high flexibility as a binder-free cathode material for Na-Se batteries. The fibrous unique structure of the Se@MCNFs is beneficial to alleviate the volume change of Se during cycling, improve the utilization of active material, and suppress the dissolution of polyselenides into electrolyte. The freestanding Se@MCNF thin-film electrode exhibits high discharge capacity (596 mA h g(-1) at the 100th cycle at 0.1 A g(-1)) and excellent rate capability (379 mA h g(-1) at 2 A g(-1)) for Na-Se batteries. In addition, it also shows long cycle life with a negligible capacity decay of 0.067% per cycle over 300 cycles at 0.5 A g(-1). This work demonstrates the possibility to develop high performance Na-Se batteries and flexible energy storage devices.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据