Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 22, Issue 12, Pages 3034-3038Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(11)61567-7
Keywords
quasicrystal; Ti1.4V0.6Ni alloy; electrochemical properties; cyclic stability; high-rate discharge; discharge capacity
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Funding
- Doctoral Program of Tertiary Education of the Ministry of Education of China [20112216120001]
- Natural Science Foundation of Jilin Province, China [21215141]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [20921002]
- National Natural Science Foundation of China [21073179, 61106050]
- Scientific and Technological Supporting Program of Jiangsu Province of China [BE2012047]
- GS Yuasa Corporation of Japan
- Scientific and Technological Pillar Project of Changchun, China [11KZ38]
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The structures and electrochemical properties of the Ti1.4V0.6Ni ribbon before and after heat treatment are investigated systematically. The structure of the sample is characterized by X-ray powder diffraction analysis. Electrochemical properties including the discharge capacity, the cyclic stability and the high-rate discharge ability are tested. X-ray powder diffraction analysis shows that after heat treatment at 590 degrees C for 30 min, all samples mainly consist of the icosahedral quasicrystal phase (I-phase), Ti2Ni phase (FCC), V-based solid solution phase (BCC) and C14 Laves phase (hexagonal). Electrochemical measurements show that the maximum discharge capacity of the alloy electrode after heat treatment is 330.9 mA.h/g under the conditions that the discharge current density is 30 mA/g and the temperature is 30 degrees C. The result indicates that the cyclic stability and the high-rate discharge ability are all improved. In addition, the electrochemical kinetics of the alloy electrode is also studied by electrochemical impedance spectroscopy (EIS) and hydrogen diffusion coefficient (D).
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