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Amorphous iron oxide-selenite composite microspheres with a yolk-shell structure as highly efficient anode materials for lithium-ion batteries

Authors
Kim, Ju HyeongPark, Gi DaeKang, Yun Chan
Issue Date
21-5월-2020
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.12, no.19, pp.10790 - 10798
Indexed
SCIE
SCOPUS
Journal Title
NANOSCALE
Volume
12
Number
19
Start Page
10790
End Page
10798
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/55656
DOI
10.1039/d0nr01905d
ISSN
2040-3364
Abstract
Yolk-shell structured transition metal compounds have intrinsic structural advantages as anode materials and have been synthesized in a highly crystalline form. Thus, development of a synthesis process for a yolk-shell structure with an amorphous state, that displays high structural stability and fast ionic diffusion, is a notable research subject, with wide applications in fields such as energy storage. Herein, a novel approach for synthesizing amorphous materials with a yolk-shell structure using several facile phase transformation processes is presented. Crystalline iron oxide microspheres with a yolk-shell structure were formed by oxidation of the spray-dried product at 400 degrees C. Using the pitch/tetrahydrofuran solution infiltration method, pitch-infiltrated iron oxide was selenized at 350 degrees C to form a crystalline iron selenide-C composite. The following partial oxidation process at 375 degrees C produced a yolk-shell structured amorphous iron oxide-selenite composite. The amorphous characteristics, the yolk-shell structure, and the formation of a heterostructured interface from iron selenite during the initial cycle contributed to high electrochemical kinetic properties and excellent cycling performance of the iron oxide-selenite composite. The amorphous iron oxide-iron selenite yolk-shell microspheres exhibited enhanced reversible capacities, cycling stability, and remarkable electrochemical kinetic properties when compared to crystalline iron oxide.
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