论文部分内容阅读
研究了ＡＢ２型锆基Ｌａｖｅｓ相贮氢合金ＺｒＭｎ０．９－ｘＶｘＮｉ１．１（ｘ＝０．１～０．８）的晶体结构及其电化学性能。研究表明，ＺｒＭｎＶＮｉ合金为多相组织，当Ｍｎ含量较高时，合金的主相为Ｃ１５型Ｌａｖｅｓ相结构；随着Ｖ含量增加，合金中Ｃ１４型Ｌａｖｅｓ相的含量逐渐增加；合金的主相结构与电子浓度有关。Ｍｎ、Ｖ含量影响Ｌａｖｅｓ相合金中的不同类型四面体间隙数目及合金热力学和电化学性能。当合金中的Ｖ／（Ｍｎ＋Ｖ）比率在２／９～４／９范围内，合金表现出较好的综合电化学性能。ＺｒＭｎ０．５Ｖ０．４Ｎｉ１．１合金的最高容量为３４２ｍＡｈ／ｇ，高倍率放电能力为Ｃ２００／（Ｃ２００＋Ｃ５０）＝７５％，经１００次１００％ＤＯＤ充放电循环后，容量保持率为８５％左右。
The crystal structure and electrochemical properties of AB2 zirconium based Laves phase hydrogen storage alloy ZrMn0.9-xVxNi1.1 (x = 0.1 ~ 0.8) were studied. The results show that ZrMnVNi alloy is a multi-phase structure. When the content of Mn is higher, the main phase of the alloy is C15-type Laves phase. With the increase of V content, the content of C14-type Laves phase increases gradually The main phase structure of the alloy is related to the electron concentration. The contents of Mn and V affect the number of different types of tetrahedrons and the thermodynamic and electrochemical properties of the Laves phase alloys. When the alloy V / (Mn + V) ratio in the 2/9 ~ 4/9 range, the alloy showed good electrochemical properties. The maximum capacity of ZrMn0.5V0.4Ni1.1 alloy is 342mAh / g and the high rate discharge capacity is C200 / (C200 + C50) = 75%. After 100 cycles of 100% DOD charge and discharge, the capacity retention rate is about 85%.