磁场凝固处理对稀土贮氢合金结构和电化学性能的影响  

Effect of Magnetic Field Solidification Treatment on Microstructrure and Electrochemical Performances of Rare Earth Type Hydrogen Storage Alloy

作　　者：唐有根[1] 李玉杰[1] 舒红[1] 

机构地区：[1]中南大学,湖南长沙410083

出　　处：《稀有金属材料与工程》2007年第11期1971-1974,共4页Rare Metal Materials and Engineering

摘　　要：研究了贮氢合金凝固过程中施加直流磁场处理对其组织结构和电化学性能的影响。结果表明:磁场处理没有改变AB5型贮氢合金的CaCu5型六方体结构,但使晶胞常数a0、c0增加,晶胞体积增大;合金的电化学容量变化不大,却明显改善了其高倍率放电(C)性能和循环寿命,合金在5C的放电容量提高了27.8%,S200由0.68上升到0.81;合金中氢的扩散系数增大。The effects of the direct magnetic field treatment on the microstructure and electrochemical performances of hydrogen storage alloys during their solidification process were studied. The results show that the magnetic field treatment has little influence on the crystal structure of ABs-type hydrogen alloy except for the increase of its cell parameter （α0, c0） and cell volume. Electrochemical studies indicate that the magnetic field treatment has a little influence on the electrochemical performances of the alloys, but markedly improves the discharge performances and cycling life of the hydrogen storage alloys at high rates. The discharge capacitance of the alloy increases by 27.8% at a rate of 5 C. The S200 increases from 0.68 to 0.81, accordingly. In addition, the diffusion coefficients of the hydrogen in the alloys are also improved.

关 键 词：贮氢合金 直流磁场 凝固 晶体结构 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]