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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 6    December 2004

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Influence of annealing temperature on electrochemical properties of rapidly quenchedLPC(NiAlMn)4.25Co0.75 hydrogen storage alloy electrodes
ZHENG Qun(郑 群),  CHEN Yun-gui(陈云贵),  WANG Jin-guo(王金国),
TAO Ming-da(陶明大), TANG Ding-xiang(唐定骧),  TU Ming-jing(涂铭旌)

Department of Metallic Materials, Sichuan University, Chengdu 610065, China

Abstract: The influence of annealing temperature on the electrochemical properties and structure of the rapidly quenched LPC(NiAlMn)4.25Co0.75 hydrogen storage alloys was investigated, in which LPC represents the abbreviation of Nd-free La-Ce-Pr mischmetal after the extraction of most of Ce and Nd. After the annealing treatment between 700-900℃ for rapidly quenched alloys, their discharge capacity becomes larger and the P-C-T plateau tends to be flatter and lower. The alloy annealed at 700℃ has the highest discharge capacity and flattest plateau. The analyses by X-ray diffraction (XRD), different thermal analysis(DTA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicate that the microstructure reversion and recrystallization occur during the heating, and their feature temperatures are 477℃ and 696℃ respectively. The annealing treatments make cell volume increase, dislocations and strain decrease, and the distribution of alloy composition become homogeneous.

 

Key words:  LPC mischmetal; hydrogen storage alloys; electrochemical properties; recrystallization

ISSN 1672-7029
CN 43-1423/U

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