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Core–Shell FeSe 2 /C Nanostructures Embedded in a Carbon Framework as a Free Standing Anode for a Sodium Ion Battery
Author(s) -
Yousaf Muhammad,
Wang Zhipeng,
Wang Yunsong,
Chen Yijun,
Ali Usman,
Maqbool Muhammad,
Imran Ali,
Mahmood Nasir,
Gao Peng,
Han Ray P. S.
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202002200
Subject(s) - materials science , anode , nanostructure , nanorod , battery (electricity) , nanotechnology , carbon fibers , nanowire , energy storage , electrode , electrochemistry , ion , carbon nanotube , chemical engineering , composite material , chemistry , composite number , organic chemistry , power (physics) , physics , quantum mechanics , engineering
Embedding the functional nanostructures into a lightweight nanocarbon framework is very promising for developing high performance advanced electrodes for rechargeable batteries. Here, to realize workable capacity, core–shell (FeSe 2 /C) nanostructures are embedded into carbon nanotube (CNT) framework via a facile wet‐chemistry approach accompanied by thermally induced selenization. The CNT framework offers 3D continuous routes for electronic/ionic transfer, while macropores provide adequate space for high mass loading of FeSe 2 /C. However, the carbon shell not only creates a solid electronic link among CNTs and FeSe 2 but also improves the diffusivity of sodium ions into FeSe 2 , as well as acts as a buffer cushion to accommodate the volume variations. These unique structural features of CNT/FeSe 2 /C make it an excellent host for sodium storage with a capacity retention of 546 mAh g −1 even after 100 cycles at 100 mA g −1 . Moreover, areal and volumetric capacities of 5.06 mAh cm −2 and 158 mAh cm −3 are also achieved at high mass loading 16.9 mg cm −2 , respectively. The high performance of multi‐benefited engineered structure makes it a potential candidate for secondary ion batteries, while its easy synthesis makes it extendable to further complex structures with other morphologies (such as nanorods, nanowires, etc.) to meet the high energy demands.