La0.7Mg0.3Ni3.4-xCo0 6Mnx(x=0.0-0.5)合金主要由(La,Mg)Ni3相和LaNi5相构成,各相的晶胞参数和晶胞体积均随Mn含量的增加而增大.随Mn含量的增加,合金的放氢平衡压力从0.128 MPa(x=0.0)下降到0.067 MPa(x=0.5),导致最大吸氢量从x=0.0时的1.19%(质量分数,下同)逐渐增加到x=0.4时的1.38%.合金的最大放电容量随Mn含量的增加首先从330.4 mAh/g(x=0.0)增加到360.6 mAh/g(x=0.4),然后减小到346.9 mAh/g (x=0.5).随Mn替代量的增加,合金电极的高倍率放电能力先改善后降低,合金电极的表面反应阻抗先降低后升高,而氢的扩散系数先增加后减小,说明合金的电化学动力学性能首先提高然后降低.
参考文献
| [1] | Justi E W;Ewe H H .[J].Energy Conversion,1970,10:183. |
| [2] | Willems J J G;Buschow K H J .[J].Journal of the Less-Common Metals,1987,129:13. |
| [3] | 陈立新,雷永泉,朱光明.掺杂Fe对贮氢合金Ml（Ni-Co-Mn-Ti）5电化学性能的影响[J].稀有金属材料与工程,1998(03):135-138. |
| [4] | 马建新,潘洪革,李寿权,陈长聘.RE（NiCoMnAl）5电极合金中RE成分对微结构和电化学性能的影响[J].稀有金属材料与工程,2002(03):217-220. |
| [5] | Ovshinsky S R;Fetcenko M A;Ross J .[J].Science,1993,260:176. |
| [6] | 刘永锋,金勤伟,高明霞,朱云峰,张志鸿,潘洪革.热处理对La0.7Mg0.3Ni2.8Co0.5贮氢合金电化学性能的影响[J].稀有金属材料与工程,2003(11):942-945. |
| [7] | Kadir K;Sakai T;Uehara 1 .[J].Journal of Alloys and Compounds,1997,257:115. |
| [8] | Kadir K;Sakai T;Uehara I .[J].Journal of Alloys and Compounds,2000,302:112. |
| [9] | Kohno T et al.[J].Journal of Alloys and Compounds,2000,311:L5-L7. |
| [10] | Pan H G et al.[J].Journal of the Electrochemical Society,2003,150(05):A565. |
| [11] | Sakaia T et al.[J].Journal of the Less-Common Metals,1990,161:193. |
| [12] | Liu Y F et al.[J].Journal of Alloys and Compounds,2003,65:246. |
| [13] | Takeshita T .[J].Inorganic Chemistry,1974,13:2283. |
| [14] | Kuriyama N et al.[J].Journal of Alloys and Compounds,1993,202:183. |
| [15] | Zhang G et al.[J].Journal of the Electrochemical Society,1995,142:2695. |
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%