High voltage spinel cathode materials for high energy density and high rate capability Li ion rechargeable batteries

We have synthesized LiMn1.5Ni0.4Cr0.1O4 cathode material for high energy density Li ion rechargeable batteries using sol-gel method. The synthesized materials were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy, cyclic voltammetry and charge-discharge characteristics. It was found that phase pure materials were obtained an annealing temperature of 875 degrees C for 15 h. The maximum discharge capacity at a constant charge-discharge current rate 1C, 0.5C, and 0.2C were found to be about 99 mAh g(-1), 110 mAh g(-1), and 131 mAh g(-1), respectively. The capacity retentions after 50 charge-discharge cycles were found to be about 99%, 97%, and 97.3% at discharge current rates of 0.2C. 0.5C,and 1 C. The stable electrochemical behavior of the above cathode material even at high Crate, showed that it could be used for high energy density and high rate capability Li ion rechargeable batteries. (C) 2009 Elsevier B.V. All rights reserved.