为了提高La-Mg-Ni系A2B7型贮氢合金的电化学循环稳定性,添加少量的Si,用铸造工艺制备了La0.75 Mg0.25 Ni3.3 Co0.2 Six(x＝0、0.05、0.1、0.15、0.2)贮氮合金,分析并测试了其微观结构和电化学性能,以及高倍率放电能力,交流阻杭等动力学性能.结果表明,合金具有多相结构,主相由CaCu5型相和Ce2Ni7型相组成.随着Si元素含量的增加,合金中的CaCu5型相逐渐的增加,Ce2Ni7型相则相应地减少.Si元素的添加提高了合金的循环稳定性,但使合金的最大放电容量和高倍率放电能力下降,这与Si添加使合金中各相的相对含量发生改变和使合金表面产生钝化现象有关.
参考文献
| [1] | Meli F;Sakai T;Zottel A et al.[J].Journal of Alloys and Compounds,1995,221:284-290. |
| [2] | Hsu Y S;Perng T P .[J].Journal of Alloys and Compounds,1995,227:180-185. |
| [3] | Tsukahara M.;Kamiya T. .Hydrogen Storage and Electrode Properties of V-Based Solid Solution Type Alloys Prepared by a Thermic Process[J].Journal of the Electrochemical Society,2000(8):2941-2944. |
| [4] | Sun D;Enoki H;Gingl F et al.[J].Journal of Alloys and Compounds,1999,285:279-283. |
| [5] | Kohno T;Yoshida H;Kawsahima F et al.[J].Journal of Alloys and Compounds,2000,311:L5-L7. |
| [6] | Tang R;Liu L Q;Liu Y N et al.[J].International Journal of Hydrogen Energy,2003,28:815-819. |
| [7] | Zhang Y H;Zhao D L;Zhao X L et al.[J].Rare Metal Materials and Engineering,2008,37:2075-2080. |
| [8] | Li P;Wang X L;Zhang Y H et al.[J].Journal of Alloys and Compounds,2003,353:278-282. |
| [9] | Iwakura C;Matsuoka M;Asai K et al.[J].Journal of Power Sources,1992,38:335-343. |
| [10] | Kuriyama N;Sakai T;Miyamura H et al.[J].Journal of Alloys and Compounds,1993,202:183-197. |
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%