First Introduction of NiSe2 to Anode Material for Sodium-Ion Batteries: A Hybrid of Graphene-Wrapped NiSe2/C Porous Nanofiber

被引:159
作者
Cho, Jung Sang [1 ]
Lee, Seung Yeon [1 ]
Kang, Yun Chan [1 ]
机构
[1] Korea Univ, Dept Mat Sci & Engn, Seoul 136713, South Korea
基金
新加坡国家研究基金会;
关键词
SUPERIOR ELECTROCHEMICAL PROPERTIES; CATHODE MATERIALS; HOLLOW MICROSPHERES; LITHIUM; PERFORMANCE; OXIDE; TRANSITION; ELECTRODES; DIFFUSION; DESIGN;
D O I
10.1038/srep23338
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The first-ever study of nickel selenide materials as efficient anode materials for Na-ion rechargeable batteries is conducted using the electrospinning process. NiSe2-reduced graphene oxide (rGO)-C composite nanofibers are successfully prepared via electrospinning and a subsequent selenization process. The electrospun nanofibers giving rise to these porous-structured composite nanofibers with optimum amount of amorphous C are obtained from the polystyrene to polyacrylonitrile ratio of 1/4. These composite nanofibers also consist of uniformly distributed single-crystalline NiSe2 nanocrystals that have a mean size of 27 nm. In contrast, the densely structured bare NiSe2 nanofibers formed via selenization of the pure NiO nanofibers consist of large crystallites. The initial discharge capacities of the NiSe2-rGO-C composite and bare NiSe2 nanofibers at a current density of 200 mA g(-1) are 717 and 755 mA h g(-1), respectively. However, the respective 100th-cycle discharge capacities of the former and latter are 468 and 35 mA h g(-1). Electrochemical impedance spectroscopy measurements reveal the structural stability of the composite nanofibers during repeated Na-ion insertion and extraction processes. The excellent Na-ion storage properties of these nanofibers are attributed to this structural stability.
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页数:10
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