Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7998956 | Journal of Alloys and Compounds | 2015 | 6 Pages |
Abstract
A series of lithium and fluorine substituted Li1+xNi0.5Mn1.5O4âxFx (0 ⩽ x ⩽ 0.4) spinel powders have been synthesized by a solid-state method. The effects of LiF content on structural, electrochemical and thermal properties are extensively investigated. The XRD patterns show that impurity arises when x ⩾ 0.3. FTIR results indicate that the cation disordering degree increases with an increasing in content of the co-doping with Li and F. The LiF concentration is optimized in the range of 0.06 ⩽ x ⩽ 0.2 in which the cyclic stability and rate capability of the Li1+xNi0.5Mn1.5O4âxFx spinels are significantly improved. Moreover, TEM images reveal that co-doped (Li+ and Fâ) particles form a smooth and uniform surface film, which mitigate the interaction of active materials and electrolyte solution as well as improve cycling stability. Besides, the thermal property of the co-doped (Li+ and Fâ) LiNi0.5Mn1.5O4 can effectively suppress the exothermic reaction according to the DSC results, which improve the thermal stability of the spinel material.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Haiyan Li, Ying Luo, Jingying Xie, Quansheng Zhang, Liqin Yan,