热处理对La0．65Mg0．35Ni3．0储氢合金电极自放电性能的影响  

Effect of Annealing Treatment on the Self-discharge Property of La_(0.65)Mg_(0.35)Ni_(3.0) Hydrogen Storage Alloy Electrodes

作　　者：盛丹[1] 春林[1] 孔繁清[2,3] 熊玮[2,3] 闫慧忠[2,3] 

机构地区：[1]内蒙古大学化学化工学院,内蒙古呼和浩特010021 [2]包头稀土研究院,内蒙古包头014030 [3]稀土冶金及功能材料国家工程研究中心,内蒙古包头014030

出　　处：《稀土》2009年第3期6-9,共4页Chinese Rare Earths

基　　金：国际科技合作项目(2006DFB52550);国家自然科学基金项目资助(20363001)

摘　　要：铸态La0.65Mg0.35Ni3.0储氢合金在1173K热处理后,电极的放电容量、循环稳定性、自放电性能都有明显改善。合金电极的最大放电容量由铸态的350.6mAh.g-1提高到360.7mAh.g-1,室温静置72h后的荷电保持率由铸态的77.7%增加到83.4%。电化学压力-组成-温度(P-C-T)曲线与阳极极化曲线的测试证实了合金电极电化学性能的变化规律。The as- cast and annealed La0.05Mg0.35Ni3.0 hydrogen storage alloys were prepared and the effects of annealing at 1173K for 8h on the overall electrochemical properties of the alloy are reported in this paper. It is found that the discharge capacity, the cycle stability and the self- discharge property of the alloys are improved after annealing treatment. The maximum discharge capacity of the alloy electrode increases from 350.6mAh· g^- 1 （as - cast） to 360.7 mAh· g^-1 （1173K）. Moreover, the capacity retention rate after 72h of serf- discharge increases from 77.7% （as - cast） to 83.4% （1173K）. The variation is consistent with the results obtained from the electrochemical pressure - component - temperature （ P - C - T） curves and anodic polarization curves of the alloys.

关 键 词：La—Mg-Ni储氢合金 热处理 电化学特性 自放电 荷电保持 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TG166.4[金属学及工艺—合金]