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. 2014 Aug 29:4:5751.
doi: 10.1038/srep05751.

One-pot synthesis of manganese oxide-carbon composite microspheres with three dimensional channels for Li-ion batteries

You Na Ko  1 , Seung Bin Park  2 , Seung Ho Choi  3 , Yun Chan Kang  3
Affiliations

One-pot synthesis of manganese oxide-carbon composite microspheres with three dimensional channels for Li-ion batteries

You Na Ko et al. Sci Rep. .

Abstract

The fabrication of manganese oxide-carbon composite microspheres with open nanochannels and their electrochemical performance as anode materials for lithium ion batteries are investigated. Amorphous-like Mn3O4 nanoparticles embedded in a carbon matrix with three-dimensional channels are fabricated by one-pot spray pyrolysis. The electrochemical properties of the Mn3O4 nanopowders are also compared with those of the Mn3O4-C composite microspheres possessing macropores resembling ant-cave networks. The discharge capacity of the Mn3O4-C composite microspheres at a current density of 500 mA g(-1) is 622 mA h g(-1) after 700 cycles. However, the discharge capacity of the Mn3O4 nanopowders is as low as 219 mA h g(-1) after 100 cycles. The Mn3O4-C composite microspheres with structural advantages and high electrical conductivity have higher initial discharge and charge capacities and better cycling and rate performances compared to those of the Mn3O4 nanopowders.

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Conflict of interest statement

The authors declare no competing financial interests.

Figures

Figure 1
Figure 1. Morphologies of the Mn3O4-C composite microspheres with open-nanochannels: (a) SEM image, (b) SEM image of the crushed powders, (c)–(e) TEM images, (f) SAED pattern, and (g) dot-mapping images.
Figure 2
Figure 2. XRD patterns of the Mn3O4-C composite microspheres and Mn3O4 nanopowders.
Figure 3
Figure 3. Morphologies and dot-mapping images of the well-faceted Mn3O4 nanopowders prepared by flame spray pyrolysis: (a) TEM image, (b) high-resolution TEM image, and (c) dot-mapping images.
Figure 4
Figure 4. Electrochemical properties of the Mn3O4-C composite microspheres and Mn3O4 nanopowders: (a) and (b) charge/discharge curves of the Mn3O4-C composite microspheres and Mn3O4 nanopowders at a constant current density of 500 mA g−1, respectively, and (c) and (d) CVs of the Mn3O4-C composite microspheres and Mn3O4 nanopowders, respecitvely.
Figure 5
Figure 5. (a) Cycling performances and (b) Coulombic efficiencies of the Mn3O4-C composite microspheres and Mn3O4 nanopowders at a constant current density of 500 mA g−1, and SEM images of the Mn3O4-C composite microspheres after (c) 200 and (d) 700 cycles.
Figure 6
Figure 6. Electrochemical properties of the Mn3O4-C composite microspheres and Mn3O4 nanopowders: (a) rate performances and Nyquist plots of the electrochemical impedance spectra (b) before and (c) after 50 cycles at a current density of 500 mA g−1.
See this image and copyright information in PMC

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