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 journalArticle

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 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.

Original languageEnglish
Pages (from-to)949-955
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume26
Issue number9
DOIs
Publication statusPublished - 2001 Sep

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

Fingerprint Dive into the research topics of 'Electrode characteristics of the Cr and La doped AB<sub>2</sub>-type hydrogen storage alloys'. Together they form a unique fingerprint.

  • Cite this