新型镁基储氢合金的合成及电化学性能的研究  

Preparation and Electrochemical Characteristics ofa New Type Mg-based Hydrogen Storage Alloys

作　　者：袁华堂[1] 李秋荻[1] 王一菁[1] 宋赫男[1] 冯艳[1] 

机构地区：[1]南开大学新能源材料化学研究所,天津300071

出　　处：《高等学校化学学报》2002年第4期517-520,共4页Chemical Journal of Chinese Universities

基　　金：国家重点基础研究发展规划项目(批准号:G2000026405);"八六三"计划(批准号:2001AA515022)和天津市自然科学基金(批准号:013603211)资助.

摘　　要：用扩散法成功地合成了Ｍｇ１．５Ａｌ０．５－ｘＮｉＶｘ(ｘ＝０,０．１,０．２,０．３,０．４)系列合金．ＸＲＤ结构分析表明,合金中出现一个新的物相,其化学式为Ｍｇ３ＡｌＮｉ２,属立方晶系,Ｆｄ３ｍ空间群,新相具有很好的电化学性能．钒的添加使合金的容量进一步提高．未经任何预处理的Ｍｇ１．５Ａｌ０．３Ｖ０．２Ｎｉ合金的最大放电容量达到３３３ｍＡ·ｈ·ｇ－１(５０ ｍＡ·ｇ－１,－０．５Ｖ ｖｓ．Ｈｇ/ＨｇＯ)．Ａｌ对六方晶系Ｍｇ２Ｎｉ合金结构中Ｍｇ的部分取代对于延长合金的循环寿命有重要作用．The Mg-based hydrogen storage alloys Mg1.5Al0.5-xNiVx(x= 0, 0. 1, 0. 2, 0.3,0.4) were successfully synthesized by means of a diffusion method (MD). The structure of these alloys were examined by X-ray diffraction. A new phase was found in the alloys. Its chemical formula is Mg3AlNi2. Further studies reveal that the new phase has excellent electrochemical properties. The discharge capacity of Mg1.5Al0.5-xNiVx alloys increases owing to V addition and reaches the highest capacity of 333 mA.h.g-1 (50 mA.g-1:, -0. 5 V vs. Hg/HgO) without any treatment. The improvement of cycle life was ascribed to the partial substitution of Al for Mg in the alloy.

关 键 词：镁基储氢合金 电化学性质 合成 扩散法 放电容量 镍氢电池 负极材料 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TM912[金属学及工艺—合金]