机械球磨AB_(5)+x%80VFe复合储氢合金的微观结构与电化学性能  

Microstructure and electrochemical properties of ball-milled AB_(5)+x%VFe alloys

作　　者：李丽荣[1] Li Lirong(School of Science,Inner Mongolia of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学理学院,内蒙古包头014010

出　　处：《钢铁钒钛》2022年第4期48-54,共7页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金资助项目(51961032);内蒙古自然科学基金分析测试专项(2022FX02)。

摘　　要：采用机械球磨方法制备了MlNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3)+x%VFe(质量分数,x=5,10,15,20)储氢合金,研究了合金晶体结构和电化学性能。微结构分析表明,主相AB_(5)晶胞参数a及体积V随球磨时间增加而增加。电化学研究表明,合金的最大容量C_(max)及氢扩散系数D随x增加先增加后减少,x=10时达到最大值,分别为310 mAh/g和7.6×10^(−11) cm^(2)/s。对合金进行了循环稳定性测试,结果表明,MlNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3)+10%VFe球磨10 h的合金在100次循环后放电容量保持率为98%。The MlNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3)+x%VFe(x=5,10,15,20)composite hydrogen storage alloys were synthesized by mechanical ball-milling.The microstructure and electrochemical properties of the composites were investigated.The microstructure analysis indicates that the parameters a and V of the main phase increase with the increase of milling time.The electrochemical analysis indicates that,with increasing VFe content x,the maximum capacity C_(max) and the hydrogen diffusion coefficient D of the alloy first increase and then decrease,and reach the maximum of 310 mAh/g and 7.6×10^(−11) cm^(2)/s with x=10.The cycle stability test was carried out on the alloy,and the results show that the discharge capacity retention rate of MlNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3)+x%VFe ball-milled for 10 h was 98%after 100 cycles.

关 键 词：储氢合金 AB5合金 80VFe 机械球磨 电化学性能 

分 类 号：TF841.3[冶金工程—有色金属冶金] TG146.4[一般工业技术—材料科学与工程]