Enhanced Electrochemical Performance of CoB Amorphous Alloy through the Addition of Lanthanum

Abstract:

In order to investigate the effect of lanthanum on the electrochemical properties of CoB amorphous alloy, Co-La_x-B alloys (x = 0, 0.1, 0.5, and 1) were prepared by chemical reduction method. As negative electrodes in alkaline rechargeable batteries, Co-La_x-B alloys exhibit superior electrochemical properties. For Co-La_0.1-B alloy, at the discharge current density of 100 mA/g, the initial discharge capacity is 830.6 mAh/g and the discharge capacity has remained around 317.3 mAh/g even after 100 cycles. Moreover, the high-rate discharge ability (HRD) of Co-La_0.1-B alloy electrode at the discharge current density of 300 mA/g, 600 mA/g, and 900 mA/g is 98.16%, 95.17%, and 91.86%, respectively. The anodic polarization (AP) and the electrochemical impedance spectra (EIS) measurements indicate that the kinetics of electrochemical performance of the alloys is remarkably improved with the addition of lanthanum.

• Periodical: Materials Science Forum (Volume 914)
• Pages: 102-108
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.914.102
• Online since: February 2018
• Authors: Wei Zhao, Yi Lin Liao, Shu Jun Qiu*, Hai Liang Chu, Yong Jin Zou, Cui Li Xiang, Huan Zhi Zhang, Fen Xu, Li Xian Sun
• Keywords: Chemical Reduction Method, Co-B Alloy, Electrochemical Performance, Secondary Alkaline Battery

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