ZrMn_0.9-xV_xNi_1.1(x=0.1～0.8)Laves相贮氢合金的 电化学性能

来源期刊：中国有色金属学报1997年第3期

论文作者：张文魁 雷永泉 杨晓光 陈仰霖 王启东

文章页码：72 - 77

关键词：Zr-Mn-V-Ni 贮氢合金 Laves相 电化学性能

Key words：Zr-Mn-V-Ni hydrogen-absorbing alloys Laves phase electrochemical performances

摘    要：研究了AB₂型锆基Laves相贮氢合金ZrMn_0.9-xV_xNi_1.1(x=0.1～0.8)的晶体结构及其电化学性能。研究表明，Zr-Mn-V-Ni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。 ZrMn_0.5 V_0.4Ni_1.1合金的最高容量为342 mAh/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。

Abstract: The crystal structure and electrochemical performances of AB₂ type Zr-based Laves phase hydrogen storage alloy ZrMn_0.9-xV_xNi_1.1(x=0.1～0.8) were studied. The results revealed that the alloys were multiphase structure. When the content of Mn was high, the alloys were mainly of C15 type Laves phase, however, as Vcontent increased in alloys ,the content of C14 type Laves phase increased gradually, which indicates that the main phase structure is related to the electron concentration. The variation of Mn and Vcontent in alloys affected the numbers of various tetrahedral interstitial sites and the thermodynamic properties and electrochemical performances. It was found that the alloys with the ratio of Vto (Mn+V) over the range of 2/9-4/9 exhibited good overall electrochemical performances. The ZrMn_0.5 V_0.4Ni_1.1 alloy exhitbited excellent overall electrochemical performances. THe highest capacity of this alloy was 342mAh/g, the rate of dischargeability C₂₀₀/(C₂₀₀+C₅₀) was 75%, while after 100 charging-discharging cycles under the condition of 100% DOD, the capacity retention was still 85% or so.