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Nanomaterials 2013, 3(2), 204-220; doi:10.3390/nano3020204
Article

Effects of Microstructure on Electrode Properties of Nanosheet-Derived Hx(Ni1/3Co1/3Mn1/3)O2 for Electrochemical Capacitors

1,* , 1
, 1,2
 and 3
1 Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan 2 Japan Science and Technology Agency, CREST, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan 3 Yokohama Laboratory, Hitachi High-Tech Science Corporation, 1-18-2 Hakusan, Midori-ku, Yokohama, Kanagawa 226-0006, Japan
* Author to whom correspondence should be addressed.
Received: 8 January 2013 / Revised: 17 February 2013 / Accepted: 12 March 2013 / Published: 25 March 2013
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Abstract

Nanosheet-derived Hx(Ni1/3Co1/3Mn1/3)O2 was prepared by restacking (Ni1/3Co1/3Mn1/3)O2 nanosheets with large or small lateral sizes and their electrochemical properties in a 1 M KOH aqueous solution; microstructural factors were compared with those of bulk Hx(Ni1/3Co1/3Mn1/3)O2 (HNCM). The electrodes composed of small nanosheets exhibited very large capacitances of 1241 F·g−1 (395 mAh·g−1) at a current density of 50 mA·g−1, and 430 F·g−1 (100 mAh·g−1) at a large current density of 1000 mA·g−1. These large capacitances resulted from a heterogeneous layer structure with a large surface area and pore volume. The electrodes of large nanosheets, with a strongly interconnected microstructure and a surface area slightly larger than that of HNCM, exhibited good cycle stability and capacitances larger than that of HNCM. Microstructural control through the restacking of (Ni1/3Co1/3Mn1/3)O2 nanosheets improved the electrochemical properties of Hx(Ni, Co, Mn)O2.
Keywords: nanosheets; Hx(Ni; Co; Mn)O2; layer-structured materials; electrochemical capacitors; energy storage devices nanosheets; Hx(Ni; Co; Mn)O2; layer-structured materials; electrochemical capacitors; energy storage devices
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Yano, M.; Suzuki, S.; Miyayama, M.; Ohgaki, M. Effects of Microstructure on Electrode Properties of Nanosheet-Derived Hx(Ni1/3Co1/3Mn1/3)O2 for Electrochemical Capacitors. Nanomaterials 2013, 3, 204-220.

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