Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1623161 | Journal of Alloys and Compounds | 2008 | 5 Pages |
Abstract
Co-substituted LiCo1/6Mn11/6O4 powders were prepared by a spray-drying method for positive electrodes of lithium ion batteries. The heat treating process, crystal structure and electrochemical properties of the synthesized materials were investigated by TG/DTG, DSC, XRD, SEM, slow rate cyclic voltammetry (CV) and galvanostatic charge/discharge cycling tests. The final powders were identified as single-phase spinel LiCo1/6Mn11/6O4 with high degree of crystallization and uniform particle size distribution. In the charge/discharge potential (versus Li/Li+) ranging from 2.0 to 4.4 V, the LiCo1/6Mn11/6O4 electrode delivered high initial discharge capacity of 242 mAh gâ1 at 1/10 C rate at 25 °C. In the potential range of 3.5-4.4 V, it showed high discharge capacity and excellent cycling performance at 1/5, 1/2, 1 C rate at 25 °C and 55 °C. The improvement in cycling performance might be contributed by the stabilization of spinel structure by smaller lattice constant when manganese ion was partially substituted by Co3+ ion. The spray-drying method is an effective method to prepare co-substituted lithium manganese oxide within very short production time, and thus is promising for commercial application.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
W.K. Zhang, C. Wang, H. Huang, Y.P. Gan, H.M. Wu, J.P. Tu,