无钴AB_5型MlNi_(4.45-x)Mn_(0.40)Al_(0.15)Sn_x电极合金  

Phase structure and the electrochemical properties of Co-free AB_5 type MlNi_4.45-xMn_0.40Al_0.15Sn_x hydride electrode alloys

作　　者：马建新[1] 陈长聘[1] 潘洪革[1] 

机构地区：[1]浙江大学材料科学与工程系,浙江杭州310027

出　　处：《电池》2002年第z1期98-100,共3页Battery Bimonthly

摘　　要：对无钴AB5型MlNi4.45-xMn0.40Al0.15Snx电极合金相结构和电化学性能进行了研究。XRD分析结果表明;当Sn含量x≥0.3时,合金中除了LaNi5主相外,还存在LaNiSn等第二相,且第二相析出总量随着Sn含量的增大而增加;电化学性能测试结果表明:随着Sn含量的增加,合金的电化学充放电循环稳定性得到改善,但是对合金的放电容量和大电流放电性能有不利的影响;综合比较看,Sn含量x=0.3时合金的电化学性能最好,最大放电容量Cmax=295.0mAh/g,活化次数为2次充放电循环,300次循环后的容量保持率为70.45％,高倍率放电性能HRD900=55.18％。The phase structure and the electrochemical properties of Co-free AB5 type MlNi4.45 -x Mn0.40Al0.15Snx (x = 0. 0 0.5) hydride electrode alloys were investigated. XRD analyses indicated that there existed the second phase besides LaNi5 phase when the content of Snx≥0. 3, and the amount of the second phase increase with increasing Sn content in the alloys. The electrochemical properties results showed that with the increase of Sn content in the alloy, the electrochemical cycling stability improved dramatically, but the electrochemical capacity and the high rate-discharge ability decreased. The electrochemical studies showed that, among the alloys investigated, MlNi4.15 Mn0.40Al0.15Sn0.3 alloy had the best comprehensive electrochemical properties, which could be activated in 2 cycles with the highest maximum discharge capacity ( Cmax = 295. 0mAh/g), good high-rate discharge ability (R900 = 55.18% ) and the capacity retention of 70.45% after 300 charge-discharge cycles under the test condition of 1C current density.

关 键 词：贮氢合金 无钴合金 相结构 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]