A Core–Shell Fe/Fe2O3 Nanowire as a High‐Performance Anode Material for Lithium‐Ion Batteries. Issue 34 (13th July 2016)

• Record Type: Journal Article
• Authors: Na, Zhaolin; Huang, Gang; Liang, Fei; Yin, Dongming; Wang, Limin
• Is Part Of: Chemistry. Volume 22:Issue 34(2016)
• Page Start: 12081
• Page End: 12087
• Publication Date: 2016-07-13
• Subjects: core–shell materials -- electrochemistry -- iron -- lithium -- nanostructures; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201601757
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: The preparation of novel one‐dimensional core–shell Fe/Fe2 O3 nanowires as anodes for high‐performance lithium‐ion batteries (LIBs) is reported. The nanowires are prepared in a facile synthetic process in aqueous solution under ambient conditions with subsequent annealing treatment that could tune the capacity for lithium storage. When this hybrid is used as an anode material for LIBs, the outer Fe2 O3 shell can act as an electrochemically active material to store and release lithium ions, whereas the highly conductive and inactive Fe core functions as nothing more than an efficient electrical conducting pathway and a remarkable buffer to tolerate volume changes of the electrode materials during the insertion and extraction of lithium ions. The core–shell Fe/Fe2 O3 nanowire maintains an excellent reversible capacity of over 767 mA h g −1 at 500 mA g −1 after 200 cycles with a high average Coulombic efficiency of 98.6 %. Even at 2000 mA g −1, a stable capacity as high as 538 mA h g −1 could be obtained. The unique composition and nanostructure of this electrode material contribute to this enhanced electrochemical performance. Due to the ease of large‐scale fabrication and superior electrochemical performance, these hybrid nanowires are promising anode materials for the next generation of high‐performance LIBs. Abstract : Tunable capacity : Core–shell Fe/Fe2 O3 nanowires are synthesized as anode materials for lithium ion batteries through a facile and scalable process. A subsequent annealing process can be used to tune the capacity for lithium storage. The resulting hybrid materials demonstrate remarkably enhanced electrochemical performances with high rate capability and long‐term cycling stability (see figure).