车用金属氢化物-镍电池负极材料的性能  

Performance of anode material of metal hydride-nickel battery for automobile

作　　者：佘翔[1] 刘冬梅[2] 李雪 沈伟杰[1] SHE Xiang;LIU Dong-mei;LI Xue;SHEN Wei-jie(Automobile Technology School,Zhejiang Technical Institute of Economics,Hangzhou,Zhejiang 310018,China;Geely Automobile Institute,Hangzhou Vocational and Technical College,Hangzhou,Zhejiang 310018,China;School of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou,Zhejiang 311121,China)

机构地区：[1]浙江经济职业技术学院汽车技术学院,浙江杭州310018 [2]杭州职业技术学院吉利汽车学院,浙江杭州310018 [3]浙江理工大学材料科学与工程学院,浙江杭州311121

出　　处：《电池》2022年第1期38-42,共5页Battery Bimonthly

基　　金：浙江省自然科学基金项目(19Z143802)。

摘　　要：通过粉末烧结法制备不同前驱体LaNi_(5)/LaMgNi_(4)物质的量比(x)的车用金属氢化物-镍电池用La-Mg-Ni储氢合金,研究x对合金物相组成、显微组织和电化学性能的影响。储氢合金在x=0.75和0.95时,由(La,Mg)_(5)Ni_(19)和(La,Mg)_(2)Ni_(7)相组成;x=1.20时,为(La,Mg)_(5)Ni_(19)单相;x=1.50时,由(La,Mg)_(5)Ni_(19)和LaNi_(5)相组成。各储氢合金的活化性能良好,且随着x的增加,最大放电容量Q max逐渐减小,第100次循环的容量保持率S_(100)先减小、后增大;当x=1.20时,S_(100)最小、极化电阻R_(p)最大、交换电流I_(0)最小。储氢合金按氢扩散系数D从大至小依次为x=1.50、0.95、1.20和0.75。适量的(La,Mg)_(2)Ni_(7)和LaNi_(5)相,有助于提升储氢合金电极的倍率性能;电极的放电速率与D正相关。La-Mg-Ni hydrogen storage alloys of metal hydride-nickel battery for automobile with different precursor LaNi_(5)/LaMgNi_(4)molar ratio(x)were prepared by powder sintering method,the effects of x on phase composition,microstructure and electrochemical performance of the alloys were studied.The hydrogen storage alloy consisted of(La,Mg)_(5)Ni_(19)and(La,Mg)_(2)Ni_(7)phases when x=0.75 and 0.95,(La,Mg)_(5)Ni_(19)single phase when x=1.20,(La,Mg)_(5)Ni_(19)and LaNi_(5)phases when x=1.50.All hydrogen storage alloys had good activation properties,with the increase of x,the maximum discharge capacity Q_(max) decreased gradually,the capacity retention rate at the 100th cycle S_(100) first decreased and then increased.When x=1.20,the S_(100) was minimum,the polarization resistance R_(p) was maximum and the exchange current I_(0) was minimum.The hydrogen diffusion coefficient D value of hydrogen storage alloys from large to small order was x=1.50,0.95,1.20 and 0.75.The appropriate(La,Mg)_(2)Ni_(7)and LaNi_(5) phases was helpful for the hydrogen storage to improve the rate capability,the discharge rate of electrode was positively correlated with D.

关 键 词：LaNi_(5) LaMgNi_(4) 储氢合金 物相 电化学性能 金属氢化物-镍电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]