MlNi_(4.07)Co_(0.45)Mn_(0.38)Al_(0.31)储氢合金的高倍率性能  

High rate performance of MlNi_(4.07)Co_(0.45)Mn_(0.38)Al_(0.31) hydrogen storage alloy

作　　者：甘辉辉 杨毅夫[1] 邵惠霞[1] 

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《电池》2015年第4期194-197,共4页Battery Bimonthly

基　　金：国家"863"计划项目(2012AA110303)

摘　　要：采用12 mol/L NaOH+0.5 mol/L NH4F+0.1 mol/L KBH4混合溶液对储氢合金MlNi4.07Co0.45Mn0.38Al0.31进行表面处理,并以纳米碳粉作为导电剂,提高储氢合金电极的高倍率充放电性能。XRD、SEM与X射线能谱(EDS)分析表明:处理后的储氢合金表面生成了纳米棒状微粒;合金表面的Al、Mn和Fe部分溶解,形成富Ni层;处理前后的储氢合金均为CaCu5型晶体结构。以10%超细镍粉、5%乙炔黑和5%DJ-01导电炭黑为导电剂时,处理后合金电极常温10.0 C放电至0.8 V时的比容量分别为50.6 m Ah/g、102.2 m Ah/g和120.6 m Ah/g。In order to improve the high rate charge-discharge performance of hydrogen storage alloy electrode, hydrogen storage alloy MlNi4.07Co0.45Mn0.38Al0.31 was surface treated by mixture solution of 12 mol/L NaOH ＋0. 1 mol/L KBH4 ＋0. 5 mol/L NH4F, carbon powder was chosen as the conductive additive. The analyses of XRD,SEM and X-ray energy dispersive spectrometry（EDS） showed that after treating, some red-like nano-particles were formed on the surface of hydrogen storage alloy, A1, Mn and Fe on the surface of the alloy were partially dissolved, a Ni-rich layer was formed. The CaCus crystal structure was kept unchanged after surface treatment. As 10% super fine Ni powder,5% Acetylene black or 5% DJ-01 conductive carbon black was used as the conductive additive,the specific capacity at lO. 0 C rate discharge to 0. 8 V at room temperature of the alloy electrode after treating was 50. 6 mAh/g,102.2 mAh/g and 120. 6 mAh/g,respectively.

关 键 词：MH电极 表面处理 储氢合金 MH/NI电池 

分 类 号：TG139.7[一般工业技术—材料科学与工程] O646[金属学及工艺—合金]