Park, HY Chang, I Cho, WI Cho, BW Jang, H Lee, SR Yun, KS 2024-01-21T12:00:51Z 2024-01-21T12:00:51Z 2021-09-05 2001-09 0360-3199 https://pubs.kist.re.kr/handle/201004/140217 AB(2)-type alloy, a kind of hydrogen storage alloys used as an anode of Ni-MH batteries, has a large discharge capacity but still has several problems such as initial activation, cycle life and self-discharge. In this study, we have investigated the effects of Cr addition and fluorination after La addition on AB(2)-type alloy with Zr0.7Ti0.3V0.4Mn0.4Ni1,2 Composition. The EPMA and SEM surface analysis techniques were used and the crystal structure was characterized by XRD analysis. Metal hydride negative was characterized by galvanostatic cycling test, electrochemical impedance spectroscopy and potentiodynamic polarization. Cr-addition is found to be effective to improve cycle life and self-discharge characteristics but ineffective to promote initial activation due to the formation of stable oxide film on alloy surface. Highly reactive particles have been formed by fluorination after La-addition to the alloys and those particles may remarkably improve the initial activation of MH-negative electrodes. (C) 2001 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD HYDRIDE BATTERY SURFACE-TREATMENT ALKALINE-SOLUTION Electrode characteristics of the Cr and La doped AB(2)-type hydrogen storage alloys Article 10.1016/S0360-3199(01)00033-7 1 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.26, no.9, pp.949 - 955 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 26 9 949 955 scie scopus 000170524500006 2-s2.0-0035452224 Chemistry, Physical Electrochemistry Energy & Fuels Chemistry Electrochemistry Energy & Fuels Article HYDRIDE BATTERY SURFACE-TREATMENT ALKALINE-SOLUTION AB(2)-type hydrogen storage alloy initial activation cycle life self-discharge Cr-doping La-doping fluorination