汽车氢镍电池负极材料的热处理与性能研究  

Study on heat treatment and performance of negative electrode material for vehicle NiMH battery

作　　者：陶炳全[1] 张华[1] 杨星焕 罗志敏 卢凤喜 TAO Bing-quan;ZHANG Hua;YANG Xing-huan;LUO Zhi-min;LU Feng-xi(Xingtai Polytechnic College,Xingtai Hebei 054000,China;Yanshan University,Qinhuangdao Hebei 066000,China)

机构地区：[1]邢台职业技术学院,河北邢台054000 [2]燕山大学,河北秦皇岛066000

出　　处：《电源技术》2020年第11期1642-1646,共5页Chinese Journal of Power Sources

基　　金：国家自然科学基金资助项目(20903078)。

摘　　要：采用真空电弧熔炼的方法制备了Y0.69La0.31Ni3.25Al0.1Mn0.15储氢合金,考察了退火温度对储氢合金显微组织、物相组成和电化学性能的影响。结果表明,铸态和850、900℃热处理态储氢合金主要由CaCu5、Ce5Co19和Ce2Ni7(Gd2Co7)型相组成,而950、1000和1050℃热处理态储氢合金主要由Ce2Ni7和Ce5Co19型相组成。随着退火温度升高,储氢合金的相丰度、晶胞体积、最大放电比容量、容量保持率和高倍率放电性能HRD都表现出先增加后减小的特征,950℃热处理态储氢合金的Ce2Ni7型相的相丰度和晶胞体积最大,此时储氢合金具有最大的放电比容量(372.6 mAh/g)、最低的放氢平台压、最大的容量保持率和最优的HRD900(83.5%),储氢合金电极的高倍率放电性能与储氢合金中的氢扩散密切相关。Y0.69La0.31Ni3.25Al0.1Mn0.15 hydrogen storage alloy was prepared by vacuum arc melting,the effect of annealing temperature on the microstructure,phase composition and electrochemical properties of the alloy was investigated.The results show that the as cast and 850℃,900℃heat-treated hydrogen storage alloys are mainly composed of CaCu5,Ce5Co19 and Ce2Ni7(Gd2Co7)type phases,while the 900℃,1000℃and 1050℃heat-treated hydrogen storage alloys are mainly composed of Ce2Ni7 and Ce5Co19 phases.With the increase of annealing temperature,the phase abundance,cell volume,maximum discharge capacity,capacity retention and high rate discharge performance HRD of the hydrogen storage alloy increase first and then decrease.The Ce2Ni7 phase abundance and cell volume of the heat-treated hydrogen storage alloy at 950℃are the largest.At this time,the hydrogen storage alloy has the maximum discharge capacity(372.6 mAh/g),the lowest hydrogen release platform pressure,the maximum capacity retention rate and the optimal HRD900(83.5%),the high rate discharge performance of the hydrogen storage alloy electrode is closely related to the hydrogen diffusion in the hydrogen storage alloy.

关 键 词：氢镍电池 负极材料 铸态 退火态 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]