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

Nanomaterials

Masato Yano¹  Shinya Suzuki¹  Masaru Miyayama¹ 

[1] Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan; E-Mails:

关键词: nanosheets;    H_x(Ni;    Co;    Mn)O₂;    layer-structured materials;    electrochemical capacitors;    energy storage devices;   

DOI  :  10.3390/nano3020204

来源: mdpi

【 摘 要 】

Nanosheet-derived H_x(Ni_1/3Co_1/3Mn_1/3)O₂ was prepared by restacking (Ni_1/3Co_1/3Mn_1/3)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 H_x(Ni_1/3Co_1/3Mn_1/3)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 (Ni_1/3Co_1/3Mn_1/3)O₂ nanosheets improved the electrochemical properties of H_x(Ni, Co, Mn)O₂.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.