NDLI: Nano electrochemical reactors of Fe<sub>2</sub>O<sub>3</sub> nanoparticles embedded in shells of nitrogen-doped hollow carbon spheres as high-performance anodes for lithium-ion batteries

Content Provider	Royal Society of Chemistry (RSC)
Author	Chen, Qianwang He, Mengni Yang, Yang Zheng, Fangcai
Copyright Year	2015
Abstract	Iron oxides are extensively investigated as anode materials for lithium-ion batteries (LIBs) because of their large specific capacities. However, they undergo huge volume changes during cycling that result in anode pulverization and loss of electrical connectivity. As a result, the capacity retention of the iron oxide anodes is poor and should be improved for commercial applications. Herein, we report the preparation of ultrasmall Fe2O3 nanoparticles embedded in nitrogen-doped hollow carbon sphere shells (Fe2O3@N-C) by the direct pyrolysis of Fe-based zeolitic imidazolate frameworks (Fe-ZIF) at 620 °C in air. As an anode material for LIBs, the capacity retained was 1573 mA h g−1 after 50 cycles at a current density of 0.1 C (1 C = 1000 mA g−1). Even undergoing the high-rate capability test twice, it can still deliver a remarkably reversible and stable capacity of 1142 mA h g−1 after 100 cycles at a current density of 1 C. The excellent electrochemical performance is attributed to the unique structure of ultrasmall Fe2O3 nanoparticles uniformly distributed in the shell of nitrogen-doped carbon spheres, which simultaneously solve the major problems of pulverization, facilitate rapid electrochemical kinetics, and effectively avoid the aggregation of Fe2O3 nanoparticles during de/lithiation. The novel method developed in this work for the synthesis of functional hybrid materials can be extended to the preparation of various MOFs-derived functional nanocomposites owing to the versatility of links and metal centers in MOFs.
Starting Page	3410
Ending Page	3417
Page Count	8
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	8
Journal	Nanoscale
DOI	10.1039/c4nr06321j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Lithium-ion battery Pyrolysis Iron oxide Anode Electrochemistry Zeolitic imidazolate framework Carbon Electric current Electrochemical kinetics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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