Ti_1.4V_0.6Ni quasicrystal and its composites with xV₁₈Ti₁₅Zr₁₈Ni₂₉Cr₅Co₇Mn alloy used as negative electrode materials for the nickel-metal hydride (Ni-MH) secondary bat

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• 作者：Wanqiang Liu^a ; ^b ; ShanShan Zhang^a ; Limin Wang^b ; ^{lmwang@ciac.jl.cn}
• 关键词：Metals and alloys ; Composite materials ; Microstructure ; Electrochemical hydrogen storage
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 July, 2012
• 卷：79
• 期：Complete
• 页码：122-124
• 文件大小：442 K

摘要

This study examined the structure and electrochemical hydrogen storage characteristics of the Ti_1.4V_0.6Ni quasicrystal and their ball-milled composites with V₁₈Ti₁₅Zr₁₈Ni₂₉Cr₅Co₇ alloy. It is found by XRD that composite material alloys consist of the icosahedral quasicrystal (I-phase), C14 Laves phase with a hexagonal structure and a V-based solid solution phase with a BCC structure and a face centered cubic (FCC) phase with a Ti₂Ni-type structure. The maximum discharge capacity of the alloy electrodes increases with increasing V₁₈Ti₁₅Zr₁₈Ni₂₉Cr₅Co₇ in the Ti_1.4V_0.6Ni alloy when using such composite materials as Ni-MH battery anodes under the condition that the discharge current density is 30 mA g^鈭?#xA0;1 at 303 K. Also, composite materials lead to significant improvement in the high-rate dischargeability (HRD) as well as the cyclic stability.