期刊
CHEMICAL ENGINEERING JOURNAL
卷 385, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123453
关键词
Iron monosulfide; Sulfurized polyacrylonitrile; Hybrid anode material; Self-supporting electrode; High energy density
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2017R1A4A1015711]
- National Research Foundation of Korea [21A20151713274] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Sodium-ion based energy storage systems have attracted extensive attention due to the similarities in the mechanism of operation with lithium-ion batteries along with the additional benefit of low cost and high abundance of sodium resources. Iron sulfide-based electrodes that operate via conversion mechanism have shown ample potential for high energy sodium-ion storage. However, the problems related with tremendous volume changes and the dissolution of sodium polysulfides in the electrolyte deteriorate the cycle life and limit their application in sodium-ion batteries (SIBS). Herein, a hybrid anode material, FeS/SPAN-HNF, with iron sulfide (FeS) nanoparticles decorated in a sulfurized polyacrylonitrile (SPAN) fiber matrix is demonstrated as flexible and freestanding anode material for high-rate SIBS. Unlike previous strategies in which FeS is encapsulated in an electrochemically inactive carbon matrix, this study utilizes SPAN, an electrochemically active material, as a dual functional matrix that can efficiently buffer volume expansion and sulfur dissolution of FeS nanoparticles as well as provide significant capacity improvement. The as-designed electrode is self-standing and flexible, without current collectors, binders or additional conductive agents, thus rendering enhanced practical capacity and energy density. This electrode showed a high reversible capacity of 782.8 mAh g(-1) at 200 mA g(-1) with excellent high rate capability, maintaining 327.5 mAh g(-1) after 500 cycles at 5A g(-1), emphasizing promising prospects for the development of flexible and high energy density SIBS.
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