Cu代替部分Co对Mm(NiMnAlSiFe)_(4.2-4.7)Co_(0.65-x)Cu_x合金性能影响的研究  

Electrochemical property of Mm ( NiMnAlSiFe)_(4.2-4.7)Co_(0.65-x) Cu_x hydrogen storage alloys with partial substitution of Co by Cu

作　　者：黄朝辉[1] 黄玲[1] 黄奇书[1] 雷一锋[1] 彭能[1] 张四奇[1] 

机构地区：[1]广州有色金属研究院,广东广州510650

出　　处：《材料研究与应用》2013年第2期86-90,共5页Materials Research and Application

摘　　要：为获得高性价比的商业化AB5型贮氢合金,研究了以Cu代替部分Co对Mm(NiMnAl-SiFe)4.2-4.7Co0.65-xCux(x≤0.38mol)合金的电化学性能的影响.实验结果表明,Cu添加量为0～0.38mol时,其最大放电比容量Cmax由352.7mA.h/g降至310.9mA.h/g,高倍率放电性能HRD2520由65.82%降至34.13%;合金充放电循环300次,容量保持率S300由81.89%降至62.58%;合金的初始活化次数为2～3次,氢平台区则变窄,吸氢平台压先上升而后下降.Cu添加量为0.10mol时,合金具有较好的性价比:Cmax=333.2mA.h/g,HRD2520=60.27%;容量保持率为80%时,循环寿命为346次;吸氢平台压为0.082MPa,最大吸氢量可达1.00%.In order to obtain highly cost-effective ABa type hydrogen storage alloys, the electrochemical property of alloys Mm（NiMnA1SiFe）4. 2-4.7Co0.65-xCux（x≤0.38 mol） were studied though increasing par- tial substitution content of Co by Cu. The electrochemical studies showed that during the Cu addition in- creased from 0 to 0.38 mol, the maximum discharge capacity （Cmax） of these alloys decreased from 352.7 to 310.9 mA . h/g,the high rate discharge ability HRD2sz0 decreased from 65.82% to 34.13% ,the cycling stability （C300/Cmax） Of the alloy electrodes decreased from 81.89% to 62.58%. Further,the P-C-T curves of these alloys were tested, and the results showed that the number of activation was 2-3 times, with hydro- gen platform areas narrowing, and platform pressures of hydrogen firstly increasing and then decreasing. All the experiments results showed that with 0.10 mol Cu addition,the alloy had a good quality-price ratio and its electrochemical properties showed as following： the maximum discharge capacity of this alloy was 333.2 mA hg, the HRD2520 was 60.27%,the cycling times was 346 with 80% of capacity retention; platform pressure of hydrogen was 0. 082 MPa, and the maximum content of hydrogen absorption was 1.00%.

关 键 词：贮氢合金 铜 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]