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Electrochemical study of NiO nanosheets: toward the understanding of capacity fading

Kaspar, Jan and Bazarjani, Mahdi Seifollahi and Schitco, Cristina and Gurlo, Aleksander and Graczyk-Zajac, Magdalena and Riedel, Ralf (2017):
Electrochemical study of NiO nanosheets: toward the understanding of capacity fading.
In: Journal of Materials Science, Springer, pp. 6498-6505, 52, (11), ISSN 0022-2461,
[Online-Edition: http://doi.org/10.1007/s10853-017-0885-0],
[Article]

Abstract

NiO nanosheets are prepared by calcination of nickel hydroxide nanosheets, obtained by the hydrolysis of trans-bis(acetato-jO)bis(2-aminoethanol-j2 N,O)nickel(II) complex. BET analysis reveals the presence of a high specific surface area of 48 m2g-1 and a pore volume of 0.26 cm3g-1 after calcination at 400 �C. The two-dimensional NiO nanostructure undergoes a reversible lithium ion uptake and release revealing an initial unexpectedly high capacity of *1100 mAhg-1 at a cycling current of 400 mAg-1, exceeding the theoretical capacity of NiO (718 mAhg-1). We attribute this high storage capacity to the advantageous two-dimensional morphology of the sample, namely to the presence of agglomerates composed of NiO nanosheets, allowing a pronounced Li-ion storage through the insertion mechanism and by the formation of a polymer-like layer at the samples internal surfaces. However, after 20 cycles the recovered capacity diminishes rapidly due to the onset of Li-ion intercalation into NiO, which is found less reversible. In addition, an increase in the charge Transfer resistance and increase in the electrode polarization, measured by differential capacity, contribute to the analyzed capacity decay upon continuous cycling.

Item Type: Article
Erschienen: 2017
Creators: Kaspar, Jan and Bazarjani, Mahdi Seifollahi and Schitco, Cristina and Gurlo, Aleksander and Graczyk-Zajac, Magdalena and Riedel, Ralf
Title: Electrochemical study of NiO nanosheets: toward the understanding of capacity fading
Language: English
Abstract:

NiO nanosheets are prepared by calcination of nickel hydroxide nanosheets, obtained by the hydrolysis of trans-bis(acetato-jO)bis(2-aminoethanol-j2 N,O)nickel(II) complex. BET analysis reveals the presence of a high specific surface area of 48 m2g-1 and a pore volume of 0.26 cm3g-1 after calcination at 400 �C. The two-dimensional NiO nanostructure undergoes a reversible lithium ion uptake and release revealing an initial unexpectedly high capacity of *1100 mAhg-1 at a cycling current of 400 mAg-1, exceeding the theoretical capacity of NiO (718 mAhg-1). We attribute this high storage capacity to the advantageous two-dimensional morphology of the sample, namely to the presence of agglomerates composed of NiO nanosheets, allowing a pronounced Li-ion storage through the insertion mechanism and by the formation of a polymer-like layer at the samples internal surfaces. However, after 20 cycles the recovered capacity diminishes rapidly due to the onset of Li-ion intercalation into NiO, which is found less reversible. In addition, an increase in the charge Transfer resistance and increase in the electrode polarization, measured by differential capacity, contribute to the analyzed capacity decay upon continuous cycling.

Journal or Publication Title: Journal of Materials Science
Volume: 52
Number: 11
Publisher: Springer
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Mar 2017 09:13
Official URL: http://doi.org/10.1007/s10853-017-0885-0
Additional Information:

Dedicated to Dr. Mahdi Seifollahi Bazarjani. Mahdi Seifollahi Bazarjani: Deceased in February 2015.

Identification Number: doi:10.1007/s10853-017-0885-0
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