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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 (CC BY 3.0).

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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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