کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1286006 | 973169 | 2007 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Investigation of positive electrodes after cycle testing of high-power Li-ion battery cells II: An approach to the power fading mechanism using hard X-ray photoemission spectroscopy Investigation of positive electrodes after cycle testing of high-power Li-ion battery cells II: An approach to the power fading mechanism using hard X-ray photoemission spectroscopy](/preview/png/1286006.png)
X-ray photoemission spectroscopic and high-resolution hard X-ray photoemission spectroscopic studies of positive electrodes in LiNi0.73Co0.17Al0.10O2 and hard carbon based batteries were carried out to elucidate the mechanism of battery degradation. Li2CO3, hydrocarbons, ROCO2Li, polycarbonate-type compounds and LiF were observed on positive electrode surfaces and the amount of carbonates was found to have increased after cycle testing. Above 60 °C, signs of electrolyte decomposition were indicated. Near the surface of the positive electrodes, a Li-deficient cubic phase is present and grows with degradation. Capacity and power fade could be related to the amount of species on the surface and the thickness of the Li-deficient cubic phase near the surface.
Journal: Journal of Power Sources - Volume 174, Issue 2, 6 December 2007, Pages 795–799