摘要
采用中频感应熔炼的方法制备了La_(0.8-x)Ce_(x)Mg_(0.2)Ni_(3)Co_(0.6)储氢合金,研究了不同Ce摩尔分数的退火态La_(0.8-x)Ce_(x)Mg_(0.2)Ni_(3)Co_(0.6)储氢合金的物相组成、微观结构和电化学性能。结果表明,La_(0.8-x)Ce_(x)Mg_(0.2)Ni_(3)Co_(0.6)储氢合金的主要物相都为(La,Mg)Ni_(3)、(La,Mg)_(2)Ni_(7)和LaNi_(5)相,随着x值从0增加至(0.2)0,La_(0.8-x)Ce_(x)Mg_(0.2)Ni_(3)Co_(0.6)储氢合金的最大放电容量C_(max)和腐蚀电流密度i逐渐减小,100次充放电的循环寿命S_(100)逐渐增加,交换电流密度I_(0)先增加后减小,氢扩散系数D_(0)逐渐减小,高倍率放电性能先增加后减小,当x=0.10时La_(0.8-x)Ce_(x)Mg_(0.2)Ni_(3)Co_(0.6)储氢合金取得高倍率放电性能最大值;La_(0.8-x)Ce_(x)Mg_(0.2)Ni_(3)Co_(0.6)储氢合金的高倍率放电性能主要由I_(0)决定。
La_(0.8-x)Ce_(x)Mg_(0.2)Ni_(3)Co_(0.6)hydrogen storage alloy is prepared by medium frequency induction melting method.The phase composition,microstructure and electrochemical properties of the annealed La_(0.8-x)Ce_(x)Mg_(0.2)Ni_(3)Co_(0.6)hydrogen storage alloy with different Ce substitution rates are studied.It is shown that main phases of La_(0.8-x)Ce_(x)Mg_(0.2)Ni_(3)Co_(0.6)hydrogen storage alloy include(La,Mg)Ni_(3),(La,Mg)_(2)Ni_(7)and LaNi_(5) phases.As x value rises from 0 to_(0.2)0,both the maximum discharge capacity C_(max) and corrosion current density(i)of the alloy decrease gradually,the cycle life of S_(100) charge-discharge increases gradually,the exchange current density I_(0) increases first and decreases then,the hydrogen diffusion coefficient D_(0) decreases gradually,and the high-rate discharge performance increases first and decreases then.The high-rate discharge performance of the alloy reaches the maximum when x=0.10.The high-rate discharge performance of the alloy is mainly determined by I_(0).
作者
苏张磊
李玮
罗志敏
SU Zhang-lei;LI Wei;LUO Zhi-min(Henan Vocational College of Agriculture,Zhengzhou 451450,China;Zhengzhou University,Zhengzhou 450001,China)
出处
《现代化工》
CAS
CSCD
北大核心
2022年第7期141-146,共6页
Modern Chemical Industry
基金
郑州市科技攻关项目(173SGYG2612232)
国家自然科学基金资助项目(21908217)。
作者简介
通讯联系人:苏张磊(1981-),男,硕士,讲师,研究方向为新能源汽车技术与应用,suzhanglei@hnca.edu.cn。
