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Binary transition metal oxides are considered as promising anode materials for lithium-ion batteries (LIB), because they can effectively overcome the drawbacks of simple oxides. Here, a one-step hydrothermal method is described for the synthesis of regular ZnFe2O4 octahedrons about 200 nm in size at a low temperature without further annealing being required. The ZnFe2O4 octahedrons were characterized by powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. The electrochemical performance of the ZnFe2O4 octahedrons was examined in terms of cyclic voltammetry and discharge/charge profiles. The ZnFe2O4 octahedrons exhibit a high capacity of 910 mA·h/g at 60 mA/g between 0.01 and 3.0 V after 80 cycles. They also deliver a reversible specific capacity of 730 mA·h/g even after 300 cycles at 1000 mA/g, a much better performance than those in previous reports. A set of reactions involved in the discharge/charge processes are proposed on the basis of ex situ high-resolution transmission electron microscopy (HRTEM) images and selected area electron diffraction (SAED) patterns of the electrode materials. The insights obtained will be of benefit in the design of future anode materials for lithium ion batteries.


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One-Step Hydrothermal Synthesis of ZnFe2O4 Nano-Octahedrons as a High Capacity Anode Material for Li-ion Batteries

Show Author's information Zheng Xing1Zhicheng Ju1( )Jian Yang2( )Huayun Xu2Yitai Qian1,2
Hefei National Laboratory for Physical Sciences at Microscale and Department of Chemistry University of Science and Technology of ChinaHefei, Anhui 230026 China
School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100 China

Abstract

Binary transition metal oxides are considered as promising anode materials for lithium-ion batteries (LIB), because they can effectively overcome the drawbacks of simple oxides. Here, a one-step hydrothermal method is described for the synthesis of regular ZnFe2O4 octahedrons about 200 nm in size at a low temperature without further annealing being required. The ZnFe2O4 octahedrons were characterized by powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. The electrochemical performance of the ZnFe2O4 octahedrons was examined in terms of cyclic voltammetry and discharge/charge profiles. The ZnFe2O4 octahedrons exhibit a high capacity of 910 mA·h/g at 60 mA/g between 0.01 and 3.0 V after 80 cycles. They also deliver a reversible specific capacity of 730 mA·h/g even after 300 cycles at 1000 mA/g, a much better performance than those in previous reports. A set of reactions involved in the discharge/charge processes are proposed on the basis of ex situ high-resolution transmission electron microscopy (HRTEM) images and selected area electron diffraction (SAED) patterns of the electrode materials. The insights obtained will be of benefit in the design of future anode materials for lithium ion batteries.

Keywords: Hydrothermal method, rate performance, anode materials, Li-ion batteries, ZnFe2O4 octahedrons

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Publication history
Copyright
Acknowledgements

Publication history

Received: 11 April 2012
Revised: 20 May 2012
Accepted: 24 May 2012
Published: 16 June 2012
Issue date: July 2012

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2012

Acknowledgements

Acknowledgements

This work was supported by the 973 Project of China (No. 2011CB935901), the National Natural Science Foundation of China (No. 91022033, 51172076), China Postdoctoral Science Foundation (2012M511927), Independent Innovation Foundations of Shandong University (2012ZD007), Shandong Provincial Natural Science Foundation for Distinguished Young Scholars, and start-up funding for new faculty in Shandong University.

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