Issue 14, 2015

Well-shaped Mn3O4 tetragonal bipyramids with good performance for lithium ion batteries

Abstract

Well-shaped Mn3O4 tetragonal bipyramids with a high reversible capacity of 822.3 mA h g−1 are synthesized by a simple hydrothermal method without any surfactants or coordination compounds. The structural features and morphology of the final product are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The SEM and HRTEM results reveal that all the eight exposed facets of the Mn3O4 tetragonal bipyramids are indexed to the high-energy {101} planes. The tetragonal bipyramids with high-energy facets provide the Mn3O4 anode material with a high initial discharge capacity (1141.1 mA h g−1). In addition, the anode displays a good fast rate performance, delivering a reversible capacity of 822.3 mA h g−1 (the theoretical capacity: 937 mA h g−1) at a current density of 0.2 C after 50 cycles. Moreover, the coulomb efficiency for the first cycle reaches about 66% and remains at about 100% during the subsequent cycles. A relatively detailed growth mechanism of these tetragonal bipyramids is proposed in this manuscript.

Graphical abstract: Well-shaped Mn3O4 tetragonal bipyramids with good performance for lithium ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
29 Oct 2014
Accepted
20 Dec 2014
First published
23 Dec 2014

J. Mater. Chem. A, 2015,3, 7248-7254

Author version available

Well-shaped Mn3O4 tetragonal bipyramids with good performance for lithium ion batteries

T. Li, C. Guo, B. Sun, T. Li, Y. Li, L. Hou and Y. Wei, J. Mater. Chem. A, 2015, 3, 7248 DOI: 10.1039/C4TA05821F

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