کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1294992 | 973647 | 2007 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Influence of rare earth content on Mm-based AB5 metal hydride alloys for Ni-MH batteries—An X-ray fluorescence study Influence of rare earth content on Mm-based AB5 metal hydride alloys for Ni-MH batteries—An X-ray fluorescence study](/preview/png/1294992.png)
AB5-type MH alloys with Mm (Misch metal) as the A part (with varied rare earth contents in Mm) were investigated for rare earth by XRF analysis and battery performance by life cycle tests with an objective of understanding the influence of rare earth content on electrochemical hydrogen storage. The La/Ce ratio was found to vary from 0.51 to 18.73. The capacity output varied between 179 and 266 mAh g−1. The results show that the La/Ce ratio has a strong influence on the performance, with the best performance realized with samples having an La/Ce ratio of around 12. La enhancement facilitates easy activation due to refinement in grain size and interstitial dimensions. Also, an orderly influence on crystalline structure could be seen. The study demonstrates that the rare earth content is an essential factor in determining the maximum capacity output because of its influence on crystal orientation as well as an increase in the radius of the interstitials, lattice constants and cell volumes.
Journal: Journal of Power Sources - Volume 167, Issue 1, 1 May 2007, Pages 228–233