Comparative Studies of Ti Doped LiNi0.7Co0.3O2 and LiNi0.7Co0.3O2 Nano Cathode Material for High Energy Density Li-Ion Battery

Thursday, 1 June 2017: 10:48
Grand Salon C - Section 13 (Hilton New Orleans Riverside)
R. Rusdi (Centre for Nanomaterials Research,Institute of Science), N. Kamarulzaman (Centre for Nanomaterials Research, Institute of Science), and H. Rusdi (University of Malaya (UM), Malaysia)
Ti doped LiNi0.7Co0.3O2 materials were investigated for their electrochemical characteristics. LiNi0.7Co0.3O2 and LiNi0.6Co0.3Ti0.1O2 materials were prepared using a self-propagating combustion method. The structure and morphology of the materials were characterized using X-Ray Diiffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-Ray Spectroscopy (EDX). The oxidation state of elements and their chemical environments were studied using X-Ray Photoelectron Spectroscopy (XPS). XRD results showed that the materials were all single phase with hexagonal layered structure of R-3m space group. The discharge capacities are between 135.5 and 151.1 mAhg-1. The LiNi0.7Co0.3O2 compound exhibits the highest first cycle capacity of 151.1 mAhg-1 over the voltage range of 2.5 to 4.2 V compared to the Ti doped sample LiNi0.6Co0.3Ti0.1O2, showing a capacity of 146 mAhg-1. However, at the 30th cycle, the Ti doped material shows the highest specific discharge capacity of 137.8 mAhg-1. The capacity fading is only about 5.6 % compared to 38.2% for undoped LiNi0.7Co0.3O2. Therefore, eventhough the undoped LiNi0.7Co0.3O2 material has a higher first cycle capacity, the doped compounds exhibits much better capacity retention over 30 cycles