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Batteries 2016, 2(4), 30; doi:10.3390/batteries2040030

Charge-Discharge Properties of the Surface-Modified ZrNi Alloy Electrode with Different Degrees of Boiling Alkaline Treatment

1
Advanced and High Functional Products Development Division, Aichi Steel Corporation, Tokai, Aichi 476-8666, Japan
2
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Hua Kun Liu
Received: 2 August 2016 / Revised: 21 September 2016 / Accepted: 22 September 2016 / Published: 28 September 2016
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Abstract

Charge-discharge properties of the surface-modified ZrNi negative electrodes with different degrees of boiling alkaline treatment were investigated. The boiling alkaline treatment was performed by immersing the ZrNi electrode in a boiling 6 M KOH aqueous solution for 2 h or 4 h. The initial discharge capacity for the untreated ZrNi negative electrode was 21 mAh·g−1, but it was increased to 114 mAh·g−1 and 308 mAh·g−1 after the boiling alkaline treatments for 2 h and 4 h, respectively. The discharge capacity for the ZrNi negative electrode after the treatment for 2 h steadily increased with repeating charge-discharge cycles as well as that of the untreated electrode, whereas that for the ZrNi negative electrode after the 4 h treatment greatly decreased. The high rate of dischargeability was improved with an increase in the treatment period of time, and the charge-transfer resistance was drastically decreased. Scanning electron microscopy (SEM) and electron dispersive X-ray spectroscopy demonstrated the ZrO2 passive layer on the ZrNi alloy surface was removed by the boiling alkaline treatment to form a porous morphology containing Ni(OH)2, which can be reduced to Ni during charging, leading to the reduction of a barrier for the charge-discharge reactions. View Full-Text
Keywords: ZrNi; hydrogen storage alloy; negative electrode; nickel-metal hydride (Ni-MH) battery; boiling alkaline treatment ZrNi; hydrogen storage alloy; negative electrode; nickel-metal hydride (Ni-MH) battery; boiling alkaline treatment
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Matsuyama, A.; Mizutani, H.; Kozuka, T.; Inoue, H. Charge-Discharge Properties of the Surface-Modified ZrNi Alloy Electrode with Different Degrees of Boiling Alkaline Treatment. Batteries 2016, 2, 30.

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