Electrode characteristics of the Cr and La doped AB2-type hydrogen storage alloys

H. Y. Park; I. Chang; W. I. Cho; B. W. Cho; H. Jang; S. R. Lee; K. S. Yun

doi:10.1016/S0360-3199(01)00033-7

Electrode characteristics of the Cr and La doped AB₂-type hydrogen storage alloys

H. Y. Park, I. Chang, W. I. Cho, B. W. Cho, H. Jang, S. R. Lee, K. S. Yun

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

AB₂-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 AB₂-type alloy with Zr_0.7Ti_0.3V_0.4Mn_0.4 Ni_1.2 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.

Original language	English
Pages (from-to)	949-955
Number of pages	7
Journal	International Journal of Hydrogen Energy
Volume	26
Issue number	9
DOIs	https://doi.org/10.1016/S0360-3199(01)00033-7
Publication status	Published - 2001 Sept

Keywords

AB-type hydrogen storage alloy
Cr-doping
Cycle life
Fluorination
Initial activation
La-doping
Self-discharge

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/S0360-3199(01)00033-7

Cite this

@article{cc7eb02090504c60a44ad48725962f2f,

title = "Electrode characteristics of the Cr and La doped AB2-type hydrogen storage alloys",

abstract = "AB2-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 AB2-type alloy with Zr0.7Ti0.3V0.4Mn0.4 Ni1.2 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.",

keywords = "AB-type hydrogen storage alloy, Cr-doping, Cycle life, Fluorination, Initial activation, La-doping, Self-discharge",

author = "Park, {H. Y.} and I. Chang and Cho, {W. I.} and Cho, {B. W.} and H. Jang and Lee, {S. R.} and Yun, {K. S.}",

year = "2001",

month = sep,

doi = "10.1016/S0360-3199(01)00033-7",

language = "English",

volume = "26",

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journal = "International Journal of Hydrogen Energy",

issn = "0360-3199",

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TY - JOUR

T1 - Electrode characteristics of the Cr and La doped AB2-type hydrogen storage alloys

AU - Park, H. Y.

AU - Chang, I.

AU - Cho, W. I.

AU - Cho, B. W.

AU - Jang, H.

AU - Lee, S. R.

AU - Yun, K. S.

PY - 2001/9

Y1 - 2001/9

N2 - AB2-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 AB2-type alloy with Zr0.7Ti0.3V0.4Mn0.4 Ni1.2 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.

AB - AB2-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 AB2-type alloy with Zr0.7Ti0.3V0.4Mn0.4 Ni1.2 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.

KW - AB-type hydrogen storage alloy

KW - Cr-doping

KW - Cycle life

KW - Fluorination

KW - Initial activation

KW - La-doping

KW - Self-discharge

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U2 - 10.1016/S0360-3199(01)00033-7

DO - 10.1016/S0360-3199(01)00033-7

M3 - Article

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SN - 0360-3199

VL - 26

SP - 949

EP - 955

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 9

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