用感应熔炼法制备了La0.5Pr0.2Nd0.1Mg0.2(Ni0.85-xCo0.15Alx)3.5(x=0.01～0.04)合金,并在氩气气氛下,用900℃退火处理.XRD分析表明,合金有两个主相:La2Ni7相和LaNi5相,晶轴比c/a随着Al含量的增大而增大.电化学测试表明,放电容量随着Al含量的增大而减小,由x=0.01时的394.6 mAh/g下降到x=0.04时的380.6 mAh/g,充放电循环衰减速率由x=0.01时的-0.32 mAh/(g·cycle)降为x=0.04时的-0.20 mAh/(g·cycle),合金的倍率性能随着Al含量的增大而降低,当放电电流密度为1200 mA/g时,高倍率性能由x=0.01时的61%降为x=0.04的35%.研究表明,当x≤0.02时不仅保持了合金的高容量,而且明显改善了合金的循环性能.
参考文献
| [1] | Kadir K;Sakai T;Uahara I .[J].Journal of Alloys and Compounds,1999,287:264. |
| [2] | Faliang Zhang;Yongchun Luo;Kai Sun .Effect of Co content on the structure and electrochemical properties of La_(1.5)Mg_(0.5)Ni_(7-x)Co_x (x = 0. 1.2. 1.8) hydrogen storage alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2006(1/2):218-224. |
| [3] | 张法亮,罗永春,孙凯,康龙,陈剑虹.La1.5Mg0.5Ni7-xCox（x=0～1.8）贮氢合金结构和电化学性能研究[J].功能材料,2006(02):265-269. |
| [4] | Pan Hongge;Wu Xuefeng;Gao Mingxia et al.[J].International Journal of Hydrogen Energy,2006,31:517. |
| [5] | Pan Hongge;Chcn Ni;Gao Mingxia et al.[J].Journal of Alloys and Compounds,2005,397:306. |
| [6] | Zhang Yanghuan;Li Baowei;Cai Ying et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2007,458:67. |
| [7] | Zhang Yanghuan;Ren Huiping;Li Baowei et al.[J].Materials Characterization,2007,58:637. |
| [8] | Liao B;Lei Y Q;Chen L X et al.[J].Journal of Alloys and Compounds,2006,415:239. |
| [9] | Lartigue C;Percheron-Gucgan A;Achard J C .[J].Journal of the Less-Common Metals,1984,101:391. |
| [10] | 张瑞静,吕曼祺,曹大力,陈德敏,杨柯.LaNi5-xAlx合金的Al含量对吸氢量和平衡氢压的影响[J].稀有金属,2004(04):678-682. |
| [11] | Zhang X B;Sun D Z;Yin W Y et al.[J].Electrochimica Acta,2005,50:3407. |
| [12] | Pan Hongge;Jin Qinwei;Gao Mingxia et al.[J].Journal of Alloys and Compounds,2004,376:196. |
| [13] | 唐睿,刘丽琴,柳永宁,于光,朱杰武,刘晓东.La0.8-xRExMg0.2Ni3.2Co0.6储氢合金的结构及电化学性能[J].中国有色金属学报,2005(07):1057-1061. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%