摘要
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 performances of AB 2 type Zr based Laves phase hydrogen storage alloy ZrMn 0. 9-x V x Ni 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 V content 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 V content 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 V to (Mn+V) over the range of 2/9~4/9 exhibited good overall electrochemical performances. The ZrMn 0. 9-x V x Ni 1. 1 alloy exhibited excellent overall electrochemical performances. The highest capacity of this alloy was 342 mAh/g, the rate of dischargeability C 200 /( C 200 + C 50 ) was 75%, while after 100 charging discharging cycles under the condition of 100% DOD, the capacity retention was still 85% or so.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
1997年第3期72-76,共5页
The Chinese Journal of Nonferrous Metals
基金
国家"八六三"高技术计划资助