کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1296825 | 1498360 | 2009 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: In-situ synchrotron X-ray absorption studies of LiMn0.25Fe0.75PO4 as a cathode material for lithium ion batteries In-situ synchrotron X-ray absorption studies of LiMn0.25Fe0.75PO4 as a cathode material for lithium ion batteries](/preview/png/1296825.png)
Recently, lithium bi-metal phosphates (LiM′M″PO4) have been synthesized for use as cathode materials in order to increase cell voltages and electrical performances. In this work, we have substituted Mn2+ at the 4c site of LiFePO4 to prepare the lithium bi-metal phosphate LiMn0.25Fe0.75PO4 and have found that it greatly enhances the cell voltage. At a 0.05 C discharge rate, the cell capacity was about 153 mAhg− 1 and the average working voltage rose to 3.53 V due to the Mn substitution. However, the capacity and working voltage both decrease as the discharge rate increases. By in-situ metal K-edge absorption analysis, it reveals that the substituted metal Mn2+ does not work completely at a higher discharge rate, due to poor electrical conductivity and a serious Jahn–Teller effect.
Journal: Solid State Ionics - Volume 180, Issues 20–22, 17 August 2009, Pages 1215–1219