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Issue 7, 2020
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Double-shell SnO2@Fe2O3 hollow spheres as a high-performance anode material for lithium-ion batteries

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Abstract

Construction of novel electrode materials is an effective way to enhance the electrochemical performance of lithium ion batteries (LIBs). In this work, double-shell SnO2@Fe2O3 hollow spheres are fabricated through a simple template method. It is revealed that the α-Fe2O3 nanorods are heterogeneously assembled on the surfaces of hollow SnO2 spheres. The double-shell SnO2@Fe2O3 hollow spheres, as an anode material for LIBs, demonstrate excellent lithium storage capacity and cycling stability. Their discharge specific capacity decreases to 464 mA h g−1 for the 46th cycle at a current density of 100 mA g−1, and then increases significantly to 1043 mA h g−1 up to the 190th cycle. Compared with SiO2@SnO2 (221 mA h g−1 after 190 cycles) and SnO2 (336 mA h g−1 after 190 cycles) electrodes, the better electrochemical performance of the SnO2@Fe2O3 electrode is ascribed to its hierarchical hollow urchin-like structure, the SnO2@Fe2O3 heterojunctions and the oxygen vacancies in the α-Fe2O3 nanorods. The sea urchin-like heterostructures dramatically inhibit the agglomeration and prevent the volume expansion during the cycling process. This work provides a novel way to construct a promising material with enhanced performance as an anode for LIBs.

Graphical abstract: Double-shell SnO2@Fe2O3 hollow spheres as a high-performance anode material for lithium-ion batteries

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Article information


Submitted
14 Oct 2019
Accepted
02 Jan 2020
First published
03 Jan 2020

CrystEngComm, 2020,22, 1197-1208
Article type
Paper

Double-shell SnO2@Fe2O3 hollow spheres as a high-performance anode material for lithium-ion batteries

Z. Cui, M. Sun, H. Liu, S. Li, Q. Zhang, C. Yang, G. Liu, J. Zhong and Y. Wang, CrystEngComm, 2020, 22, 1197
DOI: 10.1039/C9CE01621J

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