Pulverization mechanism of the multiphase Ti–V-based hydrogen storage electrode alloy during charge/discharge cycling |
| |
| Authors: | Mingxia Gao Shengcai Zhang He Miao Yongfeng Liu Hongge Pan |
| |
| Affiliation: | 1. Faculty of Physics, Saint-Petersburg State University, 1, Ulyanovskaya st., Peterhof, 198504, Saint Petersburg, Russia;2. Institut Néel, CNRS, 25 avenue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France;1. Perm State University, 15 Bukireva, 614990 Perm, Russia;2. MCMF, Institut Néel, CNRS, 38042 Grenoble Cedex 9, France;3. Faculty of Physics, St. Petersburg State University, 198504, 1 Ulyanovskaya St., St. Petersburg, Russia;4. A.B. Nalbandyan Institute of Chemical Physics of Armenian NAS, 5/2 P. Sevaka, 0014 Erevan, Armenia;1. Automotive Engineering Research Institue, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China;2. Energy Efficiency Office of Zoucheng Municipal People''s Government, 1556 West Taiping Road, Zoucheng, Shandong 273500, PR China;3. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, PR China;4. Australian Nuclear Science and Technology Organization, Lucas Heights, NSW, Australia;1. Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;2. Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400 085, India;1. Institute for Advanced Materials Research, Hiroshima University, Higashi, Hiroshima 739-8530, Japan;2. Materials Processing and Corrosion Engineering Division, BARC, Mumbai 400085, India;3. Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi, Hiroshima 739-8521, Japan |
| |
| Abstract: | Pulverization is an important key factor for the electrochemical cycle stability of many hydrogen storage alloys. In this paper, the pulverization mechanism of the multiphase Ti–V-based hydrogen storage alloy which mainly consists of a V-based solid solution phase with the BCC structure and a C14 Laves phase is studied based on a sample material of the Ti0.8Zr0.2V2.7Mn0.5Cr0.6Ni1.25Fe0.2 alloy. The microstructure of the alloy and the morphology change of the alloy electrode during the charge/discharge process were observed by transmission electron microscope, scanning electron microscope and atomic force microscope, etc. The effect of mechanical properties of the V-based phase and the C14 Laves phase on the pulverization behavior of the Ti–V-based alloy is discussed. The results show that microcracks initially occur at the phase boundary of the V-based phase and the C14 Laves phase and then extend to the C14 Laves phase in the charge/discharge process. The phase boundary is composed of a Ti segregated amorphous layer with a thickness of about 90 nm, mismatching with the crystallized V-base phase and C14 Laves phase. The toughness of the C14 Laves phase is much lower and the hardness is higher than that of the V-based phase. The weak bonding strength of the phase boundary, the lower toughness of the C14 Laves phase and the large volume expansion/contraction of the C14 Laves phase during charge/discharge cycling are the main factors that cause the pulverization of the Ti–V-based alloy. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
