A flexible and free-standing FeS/sulfurized polyacrylonitrile hybrid anode material for high-rate sodium-ion storage
- Haridas, Anupriya K.; Heo, Jungwon; Li, Xueying; Ahn, Hyo-Jun; Zhao, Xiaohui; Deng, Zhao; Agostini, Marco; Matic, Aleksandar; Ahn, Jou-Hyeon
- Issue Date
- ELSEVIER SCIENCE SA
- Iron monosulfide; Sulfurized polyacrylonitrile; Hybrid anode material; Self-supporting electrode; High energy density
- CHEMICAL ENGINEERING JOURNAL, v.385
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- 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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- 공학계열 > Dept.of Materials Engineering and Convergence Technology > Journal Articles
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