کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1291894 | 973375 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Crystal chemistry and electrochemical characterization of layered LiNi0.5−yCo0.5−yMn2yO2 and LiCo0.5−yMn0.5−yNi2yO2 (0 ≤ 2y ≤ 1) cathodes Crystal chemistry and electrochemical characterization of layered LiNi0.5−yCo0.5−yMn2yO2 and LiCo0.5−yMn0.5−yNi2yO2 (0 ≤ 2y ≤ 1) cathodes](/preview/png/1291894.png)
The crystal chemistry and electrochemical performance of the layered LiNi0.5−yCo0.5−yMn2yO2 and LiCo0.5−yMn0.5−yNi2yO2 oxide cathodes for 0 ≤ 2y ≤ 1 have been investigated. Li2MnO3 impurity phase is observed for Mn-rich compositions with 2y > 0.6 in LiNi0.5−yCo0.5−yMn2yO2 and 2y < 0.2 in LiCo0.5−yMn0.5−yNi2yO2. Additionally, the Ni-rich compositions encounter a volatilization of lithium at the high synthesis temperature of 900 °C. Compositions around 2y = 0.33 are found to be optimum with respect to maximizing the capacity values and retention. The rate capabilities are found to bear a strong relationship to the cation disorder in the layered lattice. Moreover, the evolution of the X-ray diffraction patterns on chemically extracting lithium has revealed the presence of Li2MnO3 phase in addition to the layered phase for the composition LiNi0.25Co0.25Mn0.5O2 with an oxidation state of manganese close to 4+, which results in a large anodic peak at around 4.5 V due to the extraction of both lithium and oxygen.
Journal: Journal of Power Sources - Volume 162, Issue 1, 8 November 2006, Pages 667–672